Packed-bed System Research Articles

Numerical study of encapsulated nanoparticles enhanced phase change material in thermal energy cool storage packed bed system

A numerical study is performed to investigate the dynamic behavior of a packed bed containing spherical capsules filled with Al2O3 nanoparticles dispersed in pure water as an enhanced phase change material (NEPCM) that can be utilized in ice storage of air conditioning systems. The heat transfer fluid (coolant) employed in the current work is an aqueous solution of 30 vol% ethylene glycol. For energy conservation of the coolant and the NEPCM, coupled partial differential equations are used to create a two-dimensional axisymmetric time-dependent model. While the energy equation for the NEPCM is solved using a completely explicit scheme, the energy equation for the coolant is discretized using a finite difference method and solved using the Alternating Direction Implicit (ADI) technique. The Al2O3 nanoparticles are dispersed in PCM with a volume concentration range of 0–5 %. The coolant inlet temperature with a range of -5 °C to -15 °C and mass flow rate of range of 0.2 to 0.8 kg/s for a storage volume of 0.5 m3 are the parameters used in the current study. The effect of the nanoparticles volume concentration, coolant mass flow rate, and coolant inlet temperature are investigated. The timewise variation of the solidified volume fraction of the bed, the cool energy stored in the bed, the bed centerline temperature, and the coolant exit temperature are predicted for both charging and recovery modes under different operating conditions.

Influence of tank-to-particle diameter ratio on thermal storage performance of random packed-bed with spherical macro-encapsulated phase change materials

Thermal energy storage material is always filled in the packed bed system in a random accumulation manner, and there is an interrelationship between the tank-to-particle diameter ratio (TPDR) and the porosity. Therefore, in this paper, the packed bed latent heat storage system is constructed based on spherical macro-encapsulated phase change materials (PCM). To study the influence of TPDR on the thermal performance of a randomly packed bed, a transient two-dimensional axisymmetric symmetry continuous solid phase model is developed. The experimental and numerical results are compared to verify the accuracy of the model. The heat transfer and pressure drop characteristics between air and PCM capsules are analyzed in detail. The results indicate that the average porosity reaches the maximum at around TPDR≈1.7 position, which is about 0.7. In the same packed bed, when the TPDR is larger, the pressure drop is more affected. The diameter of the heat storage ball changes from 25 mm to 75 mm, the TPDR is reduced by 66.7%, the heat storage of the PCM is almost unchanged, and the heat storage capacity of the stainless-steel spherical shell is reduced by 72%, and the heat storage capacity of the entire heat storage ball is reduced by 12%.

Comprehensive experimental analysis of igneous ultra-mafic rocks as thermal energy storage materials

Natural rocks have aroused great interest as available, cost-effective and eco-friendly materials for energy storage, mainly as filler materials in packed-bed systems. In this light, natural Moroccan igneous ultramafic rocks (peridotites and serpentinites) were selected for investigating their suitability as thermal energy storage materials (TESMs). This study examined the most relevant properties and characteristics, which indicate the potential of igneous ultramafic rocks as TESMs. At the same time, the effect of rising temperature on specific heat capacity, thermal expansion, thermal diffusivity and conductivity, as well as thermal stability of rocks have been investigated. The main findings reveal that both studied rocks have suitable thermo-physical properties, even though peridotite sample exhibits the highest thermal capacity (up to 4.912 MJ/m3.K at 540 °C) and hence the highest potential to be used as TESM in storage applications at high temperatures up to 500 °C.

Magnetic resonance velocity imaging of turbulent gas flow in a packed bed of catalyst support pellets

Compressed sensing magnetic resonance methods have been used to image the time-averaged velocity and turbulent kinetic energy in 3D for turbulent gas flowing through a bed of porous, hollow cylindrical catalyst support pellets. Velocity and turbulent kinetic energy images were acquired at a spatial resolution of 0.70 mm (x) × 0.70 mm (y) × 1.0 mm (z) for particle Reynolds numbers, Rep, of 500, 2500 and 6500 in a bed with a tube-to-particle diameter ratio of 4.7. These data represent the first full-field measurements of turbulent gas flow in packed beds of non-spherical pellets. The resulting images reveal several interesting features of the hydrodynamics in this system. A large degree of flow heterogeneity is observed in the bed, with regions of high-speed fluid observed near the walls and in large voids, and regions of backflow observed in the wake of pellets, between pellets, and within the pellet holes. For increasing Rep, the normalized axial velocity at the wall is found to increase, and the normalized turbulent kinetic energy becomes more homogeneous throughout the bed. The correlation between the turbulent kinetic energy and time-averaged velocity shows that the highest turbulent kinetic energy occurs in regions of intermediate time-averaged velocity. Further, the turbulent kinetic energy profile at the pellet-scale is substantially different from the case of simple channel flow for Rep≥ 2500. Overall, these measurements clearly demonstrate the ability of magnetic resonance methods for acquiring full-field flow data in packed bed systems using commercially-relevant pellets and flow conditions.

System efficiency of packed bed TES with radial flow vs. axial flow – Influence of aspect ratio

This paper compares the net system efficiency, including thermal efficiency and pressure drop effects, of radial versus axial flow packed beds for thermal energy storage. The traditional packed bed system is a cylindrical geometry where fluid flows axially from one end to another. However, issues of thermal stratification and high-pressure drop have led to recent studies on radial flow systems. One potential benefit is the reduced pressure drop in a radial flow system. This paper compares the performance of radial flow and axial flow systems at a range of aspect ratios (AR = H/Dbed) from 0.21 to 1.92 using a numerical model where the storage volume is held constant in all cases. When the radial flow bed is at a low aspect ratio (short/wide), the thermal front is improved but the pressure drop is high. At a high aspect ratio, the velocity is reduced in radial flow, leading to decreased pressure drop but an increased spreads in the thermal front that lowers thermal efficiency. The opposite trends are noted in axial flow. Thermal efficiencies of 83–91 % were noted for radial flow, while they ranged from 85 to 94 % in axial flow. Net efficiencies including pressure drop ranged from 74 to 82 % for radial flow and 80–87 % for axial flow. In both systems, a peak net efficiency was noted between the highest and lowest aspect ratio. While some aspect ratios with radial flow outperform axial flow from a net efficiency perspective, the results show that the highest net efficiency from axial flow is higher than that from radial flow. Overall, this paper highlights the importance of innovative TES designs and their potential to improve energy efficiency.

Tailoring of 3D printed polyethylenimine functionalized MCM-41 based monoliths and scrutiny on CO2 adsorption characteristics

Amine functionalized mesoporous silica materials have emerged as promising adsorbents in terms of CO2 capture. Despite the noteworthy advancement in the development of novel adsorbents, commercial implementation of solid-gas contactors in real-time application is challenging. This is because, the conventional packed bed systems exhibit high-pressure drop, poor mass as well as heat transfer characteristics, attrition, and dusting issue. Therefore, it is pre-requisite to develop definite structured configurations in view of industrial applications. In the current work, 3D printing technique is used to fabricate PEI functionalized MCM-41 based structured configuration and their CO2 adsorption performance is investigated. In this study, MCM-41 is subjected to organic modification using PEI entities with different molecular weights (MW ∼ 600, 1200, 1800) and formulated into 3D printable ceramic ink using appropriate binders and plasticizers. The ceramic ink showed shear thinning behavior when the plasticizer is minimal in the formulation. The ceramic ink is then processed into three-dimensional configurations using pneumatic extrusion technique and their physicochemical characteristics are analyzed in addition to their powder counterparts. The current work aims to envisage the influence of molecular weight of organic moiety used for the functionalization of MCM-41 on the CO2 uptake capacity of 3D printed monoliths at different temperature conditions (30, 45, 60, 75, 90, 105 ℃). Through this study, we aim to tailor the design of 3D printed polyethylenimine functionalized MCM-41 based monoliths and assess their CO2 adsorption properties, selectivity, and stability across multiple cycles. By addressing these aspects, our research contributes to the field by advancing the understanding of tailored adsorbent materials for CO2 capture and highlighting the potential of 3D printing technology in fabricating structured adsorbents for industrial applications.

Waste polyvinyl chloride derived latent thermal energy storage composites for waste heat recovery via packed bed system

Latent thermal energy storage (TES) techniques utilizing phase change materials (PCMs) provide a promising way to mitigate the discrepancy between the intermittent nature of solar energy supply and consistent demand for human society. However, the development is hindered by the slow charging/discharging rates of the low thermal conductivity PCMs. Meanwhile, the high value-added utilization of waste plastic is receiving increasing attention as an environmentally sustainable strategy. In this regard, waste polyvinyl chloride (PVC) is recovered as SiC skeletons to obtain green phase change composites (PCCs) for waste heat recovery. After being infiltrated with paraffin wax (OP44E), proposed PCCs demonstrate a high retention ratio of latent heat up to 91.1% and a thermal conductivity of 2.4 W·m−1·K−1, which is benefitted from limited expansion and impurity remove process, respectively. With the elevated thermal conductivity and spectral absorptance, proposed PCCs exhibit superior solar-thermal energy storage rates. Furthermore, numerical simulation of the thermal charging/discharging performance and flow characteristics is carried out for the packed bed TES system. The results reveal a reduction in charging and discharging time by 21% and 41.1% for proposed PCCs, respectively. This work introduces a novel strategy for recycling waste heat via high-performance TES and repurposing waste plastics simultaneously.

Experimental assessment of quartz-rich rocks as storage materials for medium and high temperatures air packed bed system

Natural rocks have drawn a lot of interest as sensible storage materials for packed bed system based on their competitiveness in terms of properties, cost and availability compared to other storage materials. Nevertheless, their lifetime depends on the operating temperature range and the used heat transfer fluid. The purpose of this study is to experimentally determine the effects of two temperature ranges: medium range (100 °C–300 °C) and high range (300–600 °C) on the stability of the thermo-physical properties of three quartz-rich rocks namely pegmatite, quartz vein and trondhjemite. For that, firstly, a petrographic description was conducted. Additionally, preliminary stability tests were performed using thermogravimetric and dilatometry analyses to determine the safe operating temperature. Secondly, the durability with air was tested by applying 380 cycles in a laboratory furnace, with a heating/cooling rate of 5 °C/min and 1–2 °C/min respectively, for both temperature ranges. At the end of the durability test, experimental characterizations were conducted on the samples to determine the evolution of their main thermophysical properties such as: density, porosity, water absorption, thermal conductivity and diffusivity and thermal capacity. The obtained results demonstrate the influence of the structural properties on the thermo-mechanical stability of the quartz-rich rocks. We concluded that, large-grained rocks pegmatite and quartz vein are only suitable for medium temperature packed bed systems, while fine-grained trondhjemite rock is well-suited for both ranges.

Controllable preparation and thermal properties of SiC spherical high temperature shape-stable composite phase change materials based on gel-casting

The development of high-temperature composite phase change materials (CPCMs) suitable for mass-production and high-performance is still a very urgent problem in the efficient utilization of renewable energy. In this study, a SiC spherical high-temperature CPCMs based on aqueous gel-casting suitable for batch molding using commercially available silicone molds is proposed. The porosity of the porous SiC framework can be adjusted by changing the content of starch granules in the slurry. The sample containing 20 wt% starch has relatively high open porosity and thermal conductivity, which is considered to be close to the optimal formulation of CPCMs. This formula possesses a high thermal conductivity of 10.2 W·m−1·k−1 benefiting from the continuous thermal transport channels consisting of the uniformly distributed large spherical pores and interconnected small pores. Meanwhile, the thermal storage density of the CPCMs reaches 395.21 J·g−1 in the temperature range of 550 ℃ and 750 ℃ since up to 89.06% of the pores are filled with molten salts. At the same time, the CPCMs exhibit excellent cycle stability in 100 thermal cycles. In particular, these CPCMs can be easily integrated into thermal energy storage (TES) system. Based on the rapid heat storage simulation of the C-D model, the packed-bed latent thermal energy storage system containing spherical CPCMs will have a more uniform temperature distribution and a 26.7% reduction in charging time compared with the traditional packed-bed system. This work provides a new reference for the design of spherical CPCMs in TES systems.

Effect of variable capsule size on energy storage performances in a high-temperature three-layered packed bed system

Effect of variable capsule size on energy storage performances in a high-temperature three-layered packed bed system

Investigation of thermal energy storage system based on mining by-products for the recovery of Moroccan mining industrial waste heat

Implementing thermal energy storage system for energy intensive industrial processes such as mining industry is regarded as viable alternative to increase the energy efficiency by capturing waste heat, storing it, and then using it to produce power during night or for daily demand-supply matching. The present work aims at examining the integration of thermocline packed-bed system to recover waste heat for a Moroccan mining industry from numerical, technical and economic viewpoints. The storage single tank uses thermal oil as the heat transfer fluid, and the mining by-product (Porcellanite) issued from the same industry as storage material. An earlier developed and validated model is deployed to simulate the thermocline behavior of the storage tank and assess the performances of the investigated storage material. The mining by-product undergone extensive experimental characterization including chemical and structural composition, thermophysical properties, mechanical behavior, and durability testing, before and after thermal cycling. Porcellanite is predominantly composed of quartz with a porosity of around 0.31 and a bulk and skeletal densities of 1650 and 2420 kg/m3, respectively. Thermal cycling impacts positively its heat capacity by raising it from 0.4 J/g.K to 0.98 J/g.K resulting in a considerable increase of energy density. The thermal stability of the storage material was also demonstrated. Less than 2% of mass loss are reported after heating tests. These results revealed the suitability of the by-product for medium-temperature range. Furthermore, numerical outcomes demonstrate the great potential of the storage material to store and/or release energy with a charge efficiency of 87% and discharge efficiency of 88%. Finally, the proposed solution to recover waste heat (heat exchanger and thermal energy storage system) was economically evaluated for the Moroccan mining industrial process. Findings demonstrate an economic profitability of the proposed solution opening an important prospect for circular economy.

Study on the thermal storage performance of high-temperature molten salt spheres packed bed using different heat transfer fluids

The high-temperature packed bed latent heat thermal energy storage system (PBLHTES) system is regarded as the key to the efficient operation of concentrating solar power (CSP) system. The heat transfer and storage materials determine the thermal performance of the thermal energy storage (TES) system. In this study, a discrete scheme for the PBLHTES system has been programmed, and a one-dimensional non-equilibrium model has been established. The numerical results are in good agreement with the experimental findings of the references. Originally, the effects of different fluids' thermodynamic characteristics on thermal performance are studied. Three widely used heat transfer fluids for high temperature working conditions, namely mixed nitrate salt, mixed chloride salt, and thermal oil, are applied for the established packed bed system, respectively. Then, three systems are numerically simulated, and sensitivity analyses of the Reynolds number, Stefan number, and sphere diameter are performed. According to the results, raising the Reynolds and Stefan numbers improves the energy storage rate but leads to an increase in heat transfer temperature difference and a decrease in exergy efficiency. Increasing Stefan number enhances the thermal storage capacity of three systems but causes irreversible loss. Differently, increasing the particle diameter not only extends the thermal storage time and increases the heat transfer temperature difference in all three systems but also decreases the energy storage rate and exergy efficiency. Furthermore, the decreasing slope of exergy efficiency with an increase in Reynolds and Stefan numbers is slowing down in systems 1 and 2 but growing in system 3. With the increase in sphere diameter, the decline slope is decreasing in all three systems. Overall, it is critical to choose the suitable HTF in a traditional or novel PBLHTES system to optimize thermal storage performance.

Pore-scale numerical investigation on the thermal storage properties of packed-bed systems with phase change material microcapsules

Phase change material (PCM) microcapsules are gaining increasing attention because it can overcome the shortage of PCM macrocapsules and increase the heat transfer area, while the pore-scale thermal performance of the PCM microcapsule packed-bed systems, as well as the influence of packing methods and microcapsule sizes on thermal storage, is still poorly understood. This paper introduces various spherical PCM microcapsule pack models, including single-layered, diameter-changed two-layered, and three-layered packing models, to investigate the charging process at pore scale. The indices of thermal storage properties such as charging time, temperature distribution, phase change fraction, pressure drop and thermocline degradation are studied with the finite element method. In the single-layered thermal storage system, the results show that the charging process can be improved by reducing the capsule size and using cross-packing methods. When the capsule size is reduced from 2 to 0.5 mm with cross packing, the charging time can be shortened by 72.97%, but remarkable pressure drop is created. The results indicate that the overall thermal storage performance of multi-layered packed-bed systems is better than that of single-layered packed-bed systems. The charging time of the diameter-changed two-layered and three-layered thermal storage systems can be reduced up to 16.21% and 24.32%, respectively, compared to the single-layered in-line pack with a d = 2 mm. The filling sequence plays a key role in multi-layered thermal systems. A packed-bed system with a diameter decreasing along the heat transfer fluid (HTF) flow direction has a better capacity to reduce thermocline degradation than other packed-bed systems.

Flow Field Simulation and Measurement in Packed Beds Based on 4D‐X‐Ray Computed Tomography

AbstractX‐ray computed tomography (XCT) combined with computational fluid dynamics (CFD) simulations have proved to be a powerful and versatile tool to describe fluids flow through packed bed systems. In this contribution, two examples of the application of XCT experiments to track the fluid flow and fluid penetration in packed bed systems are shown. The first one shows how geometrical information extracted from XCT measurements can be coupled to CFD simulations to assess fluid flows reliably. Here the example of a packed bed of three‐dimensional (3D) printed cylindrical‐shaped particles is considered. Finally, a short case study on the monitoring of the progress of the water penetration front in a packed bed composed of glass spheres using four‐dimensional (4D) XCT imaging data is presented.

Preliminary study of CO2 frost formation during cryogenic carbon capture using tomography analysis

Cryogenic carbon capture (CCC) is a potential technological solution to reduce CO2 emissions and achieve the needed environmental targets. CCC provides a relatively compact solution to industries where more mature technologies would have difficulty scaling down economically. However, there is a lack of research on frost formation of CO2 within packed bed systems, despite the influence of the CO2 frost layer on thermal conductivity leading to excessive cooling costs. Understanding the rate of CO2 frost growth and accumulation within a packed bed is critical to the design of the capture column. Therefore, real-time quantitative imaging becomes increasingly desirable to study the CO2 frost formation during cryogenic carbon capture, but it may be difficult by most of the traditional measurement methods. This study aims to investigate the use of an Electrical Capacitance Tomography (ECT) to monitor the real-time CO2 frost formation in a fixed packed bed. In this work, the evolution of the permittivity distribution during the capture process has been investigated in detail by experiments, elucidating the effect of the bed material type and bed material temperature. An ECT sensor was constructed to measure frost distribution to elucidate the mechanisms of CO2 frost formation by first testing on ice frost in the packed bed. The ECT images of ice formation were reconstructed by measurement data with a conventional algorithm. The results show that ECT could effectively monitor the changes of relative permittivity caused by the frost formation in real-time. With the help of an image reconstruction algorithm, the outline and position of the permittivity change area can be monitored. These results indicate that ECT has the potential to be a novel technique for monitoring CO2 frost formation during cryogenic carbon capture.

A study with the lattice Boltzmann method on the conversion efficiency of a packed-bed reactor with different oriented packed beads configurations

We consider packed-bed reactors with dielectric beads in a two-dimensional channel geometry, apply an electric field perpendicular to the walls, and explore numerically the sensitivity of reaction conversion efficiencies of a dissociation reaction on system parameters like shape, orientation, and size of the beads and porosity of packed-bed systems. We have developed a lattice Boltzmann (LB) model that allows for simultaneous simulation of the flow field, the electric field within fluid and (solid) beads, and transport of (charged) species, such as ions and reagents. It solves Navier–Stokes for the fluid flow and the concentration field for neutral and charged species by the advection–diffusion and Nernst–Planck equation, respectively, formulated in the LB framework. The model allows to compute electric field strengths in the fluid and in the beads, by solving the Poisson equation. The method is suitable for arbitrary geometries of the flow domain and does not require body-fitted meshes. Two important conclusions can be drawn. First, the proposed LB model enables simulation of a reactive electro-kinetic fluid in a reactor with dielectric packed beads of arbitrary shape, size, and orientation. The LB method is based on Cartesian meshes irrespective of the shape of the beads and is highly parallelizable and can be extended to three-dimensional packed-bed reactors. Second, we show that reactor conversion efficiency is sensitive to shape, orientation, and size of the beads and the porosity of the packed-bed reactor. Present observations will guide the parameter settings for the beads and packed-bed reactor of more realistic three-dimensional configurations.

Silicone Nanofilament Coatings as Flexible Catalyst Supports for a Knoevenagel Condensation Reaction in Batch and Flow Systems.

In this work, silicone nanofilament (SNF) coatings were prepared via a droplet-assisted growth and shaping (DAGS) approach, where the preparation of the coatings is allowed under ambient conditions. The application of SNF coatings as catalyst supports for amino moieties from (3-aminopropyl)triethoxysilane (APTES) was investigated. With the optimized coating conditions identified, the Brunauer-Emmett-Teller surface areas of a bare glass filter substrate and bare glass beads after the coating have increased by 5-fold and 16-fold, respectively. The SNF-coated filters were readily functionalized with amino groups via a liquid-phase deposition process, and their catalytic activities for a Knoevenagel reaction were evaluated using a batch reactor and a packed bed reactor. In both reactors, the as-prepared filters demonstrated superior catalytic performance over the functionalized filters without SNF coatings. Notably, the unique flexibility of the SNF coatings allowed the facile preparation of a packed bed reactor and a scalable catalytic system. It is expected that the packed bed system established in this study will support the development and the use of various SNF-supported organocatalysts and catalytic materials.

A novel desiccant compound for air humidification and dehumidification

• A novel silica gel-based desiccant material for open air systems is proposed. • Silica gel is mixed with sodium polyacrylate, vinyl glue and polypropylene fibers. • The maximum water uptake on dry silica gel mass basis is equal to 0.32 kg kg −1 . • Thermal and sorption stability of new and on-purpose aged samples are observed. • Dehumidification capacity is around 3.5 g kg −1 when the regeneration occurs at 52 °C. Currently, there is an increasing interest in the development of HVAC systems based on solid desiccant materials to achieve efficient and affordable air dehumidification and humidification processes. Many research efforts deal with the development of novel composite materials suitable to manufacture such devices. In this work we present a novel silica gel-based desiccant compound, which can be used to prepare different products, such as sheets, monolithic components, and coatings. The proposed formulation is based on a combination of silica gel, sodium polyacrylate, vinyl glue and polypropylene fibers. The preparation procedure of the sorbent material and its characterization (adsorption capacity, morphology and surface analysis, mechanical properties by pull-off test, structural and thermal stabilities of new and aged samples and volatile compounds emissions) are described in detail. A small-scale prototype has been also manufactured and experimentally tested under typical operating conditions of air dehumidification processes. Results show that the proposed material has a suitable sorption capacity (maximum water uptake equal to 0.32 kg kg −1 ), good mechanical properties (pull adhesion strength around 2.74 MPa) and stability (decomposition threshold of 400 °C). The performances achieved by the prototype are comparable with those of a reference silica gel packed bed system, highlighting that the desiccant material performs adequately also at system scale.

Effect of variable capsule size distribution for unstructured packed bed encapsulated phase change material system

Packed bed encapsulated phase change material (PCM) energy storage systems have considerable potential for energy storage applications involved in renewable energy systems. In this paper, a 3D unstructured packed bed system consisting of spherical encapsulated phase change material with varying sizes of spheres is modelled. The main novelty of the work is that the geometry of the capsules and the flow between the capsules are resolved, even with unequal capsule sizes arranged in an irregular manner. The size of the spheres is varied by changing the radius of the spheres following specified normal distribution curves. Then, by changing the mean and standard deviation values, different size distributions of spheres are generated which are arranged in unstructured packed bed form. The model incorporates the flow of heat transfer fluid (HTF) through the gaps between the capsules, the heat transfer in both the HTF and the PCM capsules, the melting of PCM in each capsule, and the natural convection in the melted PCM. Based on the simulations, important parameters such as the melting time and energy storage rates are compared for different size distributions. It is found that for a normal distribution of capsule radius, increasing the mean radius by 2 times while keeping the standard deviation constant increases the melting rate considerably with an increase in melting time by 29.4%. The effect of standard deviation of radius was found to be significantly less as compared to that of the mean radius.

An ultra-permeable hybrid Mg-MOF-74-Melamine sponge composite for fast dynamic gas separation

Shape engineering porous solids such as metal-organic frameworks (MOFs) into hierarchical structured adsorbents allows significant process intensification. Here we propose a facile approach to obtain a mouldable structured adsorbent with high loading of porous solids by employing a commercially available low-cost melamine sponge. As a case study, Mg-MOF-74 was synthesized in an aqueous media at room temperature and coated successfully over the melamine sponge, without any pre-treatment/additive, to yield a melamine sponge-based Mg-MOF-74 composite (Mg-MOF-74@MS). Even after multiple coating steps, the composite displayed remarkable compressibility, thus providing additional degrees of freedom in designing packed bed systems over other rigid adsorbent forms and structures. The dynamic gas separation capability of the prepared Mg-MOF-74@MS composite was demonstrated via breakthrough experiments with mixtures of 20% CO2 and 80% CH4 at 1 bar and 298 K. Owing to the spatial structure of melamine sponge, the composite retained the adsorption properties of Mg-MOF-74 for CO2 capture i.e., high dynamic capacity (5.07 mmol/g), high selectivity (>100), facile regeneration and performed better than binderless Mg-MOF-74 pellets in terms of mass transfer, unused bed length (LUB) and pressure drop (large permeability). Overall, these findings open an interesting field of research with melamine sponge-based MOF structured adsorbent as a potential candidate for gas-phase adsorption-based separation applications.