Aluminum Fumarate Research Articles

A comparison between the packed and coated finned tube for adsorption system using aluminium fumarate: Numerical study

A transient numerical model has been developed using the segregated solution approach to study the performance of packed and coated finned tubes in adsorber beds for desalination and cooling applications. Published isotherms and kinetics of the Aluminium Fumarate in granular packed and powder-coated forms are used in the model to investigate the adsorber bed design. The fin configurations (fin spacing and fin height) were investigated at different operating conditions to obtain the optimum geometrical design for the packed and coated adsorber beds in terms of the specific daily water production (SDWP) and the specific cooling power (SCP). A comprehensive comparison of the SDWP and SCP was carried out at different fin height and coated thickness. The results showed that the maximum SCP and SDWP for the packed bed are 300 W/kg and 12.5 L/day/kg, while they are 825 W/kg and 34.2 L/day/kg respectively for the coated bed. The optimum design of the heat exchanger was found using the coated finned tube with an adsorbent material thickness of 0.3 mm.

Aluminum Fumarate Metal–Organic Framework: Synthesis, Characterization, and Application as a Novel Inhibitor against Corrosion of AM60B Magnesium Alloy in Ethylene Glycol Solution

The aluminum fumarate metal–organic framework (MOF) was synthesized for the application as a corrosion inhibitor of AM60B magnesium alloy in 30% ethylene glycol solution containing 0.5 M NaCl. The prepared MOF was characterized using the XRD and FTIR spectra, as well as SEM images and TGA. Electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques were used to evaluate the inhibitor performance in a concentration range of 50-400 ppm. The results indicated that the inhibition efficiency enhanced with increasing inhibitor concentration and reached 88.35% at 400 ppm, indicating the high potential of the proposed MOF.

Metal-organic framework based mixed matrix hydrogel membranes for highly efficient gas separation

MOF/polymer interface in mixed-matrix membranes (MMMs) has been considered as a crucial issue for achieving highly efficient gas separation performance. In this research, aluminum fumarate framework (A520) based mixed matrix hydrogel self-supported membranes (A520-MMHMs) were prepared by a facile UV photopolymerization. The hydrophilic A520 incorporated into hydrogel polymer effectively avoided the formation of interfacial defects and improved the compatibility between MOF and hydrogel matrix. As a result, the A520-MMHM possessed enhanced CO2 permeability (∼432.87 Barrer) and CO2/CH4 selectivity (∼51.05) in comparison with pure hydrogel membrane. This performance data is very close to the updated McKeown 2019 upper bound, far exceeding the 2008 Robeson upper bound. Therefore, the design of hydrogel membrane incorporated with water-stable MOF may open up a new way for optimizing self-supported hydrogel membrane performance in gas separation.

Vanadium Containing Metal‐organic Frameworks as Highly Efficient Catalysts for the Oxidation of Refractory Aromatic Sulfur Compounds

AbstractThe wet impregnation method was applied to prepare vanadium species on the chromium(III) terephthalate metal‐organic framework (MIL‐101) and on the aluminum fumarate metal‐organic framework (A520), two highly efficient catalysts, as well as vanadium species on the zinc terephthalate metal‐organic framework (MOF‐5), using vanadium(V) oxytributoxide as a precursor. The prepared catalysts were characterized by powder X‐ray diffraction (PXRD), Fourier transform infrared spectroscopy (FT‐IR), scanning electron microscopy (SEM), energy‐dispersive spectroscopy (EDX), N2 sorption measurement (BET), thermal analysis (TGA‐DTA), and X‐ray photoelectron spectroscopy (XPS). The prepared materials were utilized as catalysts for the oxidation of the refractory aromatic sulfur compound, dibenzothiophene (DBT), in a model diesel fuel. The catalytic oxidation of DBT to DBT‐sulfone was performed in the presence of tert‐butyl hydroperoxide (TBHP) under mild operating conditions. The heterogeneous catalysts, OV(OtBu)3−x(OH)x@MIL‐101(Cr), OV(OtBu)3−x(OH)x@A520, and OV(OtBu)3−x(OH)x@MOF‐5 demonstrated activities of 98, 98, and 10 %, respectively, in the oxidative desulfurization (ODS) process at 60 °C. The catalysts were recycled easily and reused without a significant decrease in their activity. The oxidation of DBT to DBT‐sulfone was investigated using gas chromatography, and the formation of DBT‐sulfone was confirmed by FT‐IR and 1H NMR spectroscopies.

In Situ Polymerization of Polypyrrole @ Aluminum Fumarate Metal–Organic Framework Hybrid Nanocomposites for the Application of Wastewater Treatment

Composite metal–organic frameworks combine large and accessible surface areas with low density and high stability. Herein, we present novel nanocomposites of polypyrrole/aluminum fumarate metal–organic framework (PPy/AlFu MOF), which were synthesized via in situ oxidative polymerization with the aim of MOF functionalization to enhance its thermal stability and increase the specific surface area so that these nanocomposites may be used as potential adsorbents. The synthesized nanocomposites were characterized by various techniques, such as powder X-ray diffraction, scanning electron microscopy, and Fourier-transform infrared spectroscopy (FTIR). The successful functionalization of aluminum fumarate MOF was confirmed by FTIR, and the Brunauer–Emmett–Teller (BET) surface area of the PPy/MOF nanocomposite slightly increased from 795 to 809 . Thermogravimetric analysis data also show that the weight loss of the composite is up to 30% at temperatures up to 500 . Remarkably, lead (50 ppm) sequestration using the composite was tested, and the atomic absorption spectrometry data demonstrate that PPy/MOF is a super-adsorbent for heavy metal ions. This work shows that the novel polymer–MOF composites are promising materials for the selective removal of lead from wastewater streams.

CO2 cycloaddition to epichlorohydrin over an aluminum fumarate metal-organic framework synthesized by a sonochemical route

Aluminum fumarate was tested as a catalyst for CO 2 cycloaddition to epichlorohydrin under solvent-free reaction conditions. This material was synthesized hydrothermally via a sonochemical route (Al fumarate-(S)), which exhibited a higher catalytic activity than Al fumarate synthesized by a conventional method owing to the higher number of Lewis acid sites formed in Al fumarate-(S). The CO 2 uptake of Al fumarate-(S) was high: approximately 269 mg g −1 at 25 °C and 10 bar. High conversion (96%) of epichlorohydrin with excellent selectivity (97%) to cyclic carbonate was obtained at 50 °C and 10 bar CO 2 after 6 h of reaction. The kinetic analysis of the reaction confirmed an approximately 1st order dependence on the epichlorohydrin concentration and CO 2 pressure with an activation energy of approximately 39 kJ mol −1 . The recovered Al fumarate-(S) catalyst, however, showed a steady decline in catalytic activity during the recycling runs, as reported for other metal-organic framework catalysts. The deactivation was monitored by N 2 adsorption-desorption isotherms and spectroscopic analyses. • The aluminum fumarate metal-organic framework was synthesized via a sonochemical route. • It showed higher amounts of Lewis acid sites and more active for CO 2 cycloaddition than the one conventionally prepared. • A reaction mechanism for CO 2 cycloaddition to epichlorohydrin was proposed.

Experimental Study on the Influence of Metal Doping on Thermophysical Properties of Porous Aluminum Fumarate

Metal-organic frameworks (MOFs) are emerging as potential adsorbents for adsorption based systems intended for various applications. Aluminum fumarate is one of the promising MOFs for being used as an adsorbent for water-based adsorption heat pumps. Though there have been a lot of studies regarding water adsorption characterization of aluminum fumarate, there is hardly any literature addressing the thermophysical properties. A green synthesis process is developed to enhance the thermophysical properties of MOFs. Transition metals (Nickel and Cobalt) are doped with parent aluminum fumarate at different weight percentage (5 wt%, 10 wt% and 20 wt%) during the synthesis. We measured and compared the specific heat capacity and thermal conductivity of parent aluminum fumarate and the six other modified samples. The current study shows that the specific heat capacity decreases whereas the thermal conductivity increases in accordance with the doping concentration. Among the studied samples, 20 wt% Cobalt-doped aluminum fumarate is found to have the lowest specific heat capacity and the highest thermal conductivity. These findings are crucial for the design and performance prediction of adsorption heat pumps.

A Novel Approach for the Determination of Sorption Equilibria and Sorption Enthalpy Used for MOF Aluminium Fumarate with Water

Adsorption chillers offer an environmentally friendly solution for the valorisation of waste or solar heat for cooling demands. A recent application is high efficiency data centre cooling, where heat from CPUs is used to drive the process, providing cooling for auxiliary loads. The metal organic framework aluminium fumarate with water is potentially a suitable material pair for this low temperature driven application. A targeted heat exchanger design is a prerequisite for competitiveness, requiring, amongst other things, a sound understanding of adsorption equilibria and adsorption enthalpy. A novel method is employed for their determination based on small isothermal and isochoric state changes, applied with an apparatus developed initially for volume swing frequency response measurement, to samples with a binder-based adsorbent coating. The adsorption enthalpy is calculated through the Clausius–Clapeyron equation from the obtained slopes of the isotherm and isobar, while the absolute uptake is determined volumetrically. The isotherm confirms the step-like form known for aluminium fumarate, with a temperature dependent inflection point at p rel ≈ 0.25, 0.28 and 0.33 for 30 °C, 40 °C and 60 °C. The calculated differential enthalpy of adsorption is 2.90 ± 0.05 MJ/kg (52.2 ± 1.0 kJ/mol) on average, which is about 10–15% higher than expected by a simple Dubinin approximation.

Integration of vacuum multi effect membrane distillation with adsorption/cooling system

This paper addresses the integration of vacuum multi effect membrane distillation (VMEMD) with adsorption (AD) unit to produce distilled water for many applications and cooling water to cool the buildings. Integration between VMEMD and AD systems aims to increase the water productivity with low power consumption. In this system, VMEMD is driven by hot seawater to produce fresh water, as the remind brine of VMEMD will discharge into the evaporator of AD cycle to produce other part as a fresh water. AD is a heat driven technology that can be used to generate distilled water and/or cooling water through adsorption/desorption of water vapour using porous metal organic framework (MOF) adsorbent materials. MOF is a new class of porous material with high surface area, superior adsorption characteristics and large porosity. The MOF such as, Aluminium Fumarate (Al-Fum), shows have water vapour adsorption characteristics superior to those of silica gel and zeolite. While, Nickel salts (CPO-27-Ni) was found to be more suitable for applications working at a low evaporation temperature (5 °C) and high temperature (≥90 °C), meanwhile Al-Fum showed a superior performance at a higher evaporation temperature (20 °C) and low regeneration temperature (70 °C). Both systems, VMEMD and AD, have ability to produce more distilled water with recovery ratio about 60%, in addition to produce cooling water.

Performance Investigation of a Two-Bed Type Adsorption Chiller with Various Adsorbents

In this study, the performance evaluation of an adsorption chiller (AD) system with three different adsorbents—silica-gel, aluminum fumarate, and FAM-Z01—was conducted to investigate the effects of adsorption isotherms and physical properties on the system’s performance. In addition, the performance evaluation of the AD system for a low inlet hot-water temperature of 60 °C was performed to estimate the performance of the system when operated by low quality waste heat or sustainable energy sources. For the simulation work, a two-bed type AD system is considered, and silica-gel, metal organic frameworks (MOFs), and ferro-aluminophosphate (FAPO, FAM-Z01) were employed as adsorbents. The simulation results were well matched with the laboratory-scale experimental results and the maximum coefficient of performance (COP) difference was 7%. The cooling capacity and COP of the AD system were investigated at different operating conditions to discuss the influences of the adsorbents on the system performance. Through this study, the excellence of the adsorbent, which has an S-shaped isotherm graph, was presented. In addition, the influences of the physical properties of the adsorbent were also discussed with reference to the system performance. Among the three different adsorbents employed in the AD system, the FAM-Z01 shows the best performance at inlet hot water temperature of 60 °C, which can be obtained from waste heat or sustainable energy, where the cooling capacity and COP were 5.13 kW and 0.47, respectively.

Novel technique for improving the water adsorption isotherms of metal-organic frameworks for performance enhancement of adsorption driven chillers

Thermally driven adsorption-driven chillers (ADCs) is the emerging technology for reducing primary energy consumption and greenhouse gas emission by utilizing solar energy and waste heat from various sources. The key element of these ADCs is the adsorbent materials; the performance of the systems heavily depends upon the properties of the adsorbents. Metal-organic frameworks (MOFs) are becoming the most promising adsorbent for having a high surface area, tunability, and generating S-shaped isotherms while pairing with water. In this study, MOF aluminum fumarate was synthesized using a novel environmental-friendly route and doped with two different metallic ions (Co2+, Ni2+). Various material characterization experiments were completed to check structural integrity. Additionally, a comparative investigation of water adsorption at 30 °C and 60 °C were reported for commercial aluminum fumarate and three new synthesized samples. The investigation shows a significant improvement of water uptake in the lower relative pressure region (P/Po < 0.3) for all the synthesized and doped samples.

Shaping of MOFs via freeze-casting method with hydrophilic polymers and their effect on textural properties

Abstract Shaping of metal-organic frameworks (MOFs) and tuning of their sorption properties is a very important and challenging aspect for the usage of MOFs for many applications. Both shaping and tuning can be addressed by composite preparation as an effective method. Herein, we present the shaping of the hydrothermally stable MOFs aluminum fumarate, MIL-160(Al) and MIL-101(Cr) using the freeze-casting method with the hydrophilic polymer binders polyacrylic acid (PAA), sodium polyacrylate (PAANa), polyethylene glycol (PEG), polyethylene imine (PEI), polyvinyl alcohol (PVA) and polyvinyl pyrrolidone (PVP). Furthermore, the effect of in-situ cross-linking below the freezing point (cryopolymerization) on the textural properties of monoliths was also investigated using MIL-101(Cr) and aluminum fumarate with the polymer PVA. The selected MOFs were chosen due to their outstanding stability, sorption properties and differing hydrophilicities. In the obtained mechanically stable monoliths, each MOF showed a different compatibility with the used polymers. From 21 different MOF@polymer composites with 80 wt% loading of MOF, 12 of them exhibited negligible pore blocking effects and very high nitrogen sorption properties in correspondence with the MOF mass fraction. On the other hand, water uptake is especially in cases of MOF@PVA and MOF@PVP in good agreement with the MOF fraction and can be enhanced by the contribution of the hydrophilic polymer to the composite. In particular, most MIL-101(Cr) composites showed a hydrophilic shift to lower relative pressure p·p0−1 compared to the rather hydrophobic neat MIL-101(Cr). IR spectroscopy indicated a clear interaction of PEI with the Al-MOFs aluminum fumarate and MIL-160(Al) resulting in MOF pore blocking. The molecular weight of the polymer is not significant for the freeze-casting method but plays an important role in the cryopolymerization.

Amorphous porous layered-Al2O3 derived from AlFu MOFs as an adsorbent for removing fluorine ions in industrial ZnSO4 solution

The amorphous porous layered-Al2O3 derived from aluminium fumarate metal-organic frameworks (AlFu MOFs) by roasting at 773K under air has been applied to remove fluorine ions from industrial ZnSO4 solution. The amorphous porous layered-Al2O3 was characterized by XRD, SEM and BET. The adsorption experiments were conducted under different conditions, including adsorbent dosage, initial pH, adsorption temperature and adsorption time. And the process of removing fluorine ions is well fitted with the pseudo-second-order kinetic model and Langmuir isotherm model, which is studied by the adsorption kinetics and isotherms. The theoretical maximum adsorption capacity was 12.05mgg−1. Moreover, the adsorption mechanism of the amorphous porous layered-Al2O3 was analyzed by SEM-EDS and FTIR. The results indicate that the adsorption process is affected by complexation and ion exchange between fluorine ions and amorphous porous layered-Al2O3. The regeneration of the amorphous porous layered-Al2O3 shows that the adsorbent could be reused to reduce the production cost.

Experimental testing of aluminium fumarate MOF for adsorption desalination

Many researchers consider adsorption systems as a solution for global problems such as global warming and water scarcity. The experimental and numerical data available in literature are basically focusing on using conventional adsorbent materials such as silica gel and zeolites. Recently, metal-organic framework (MOF) materials have been proposed to substitute these conventional adsorbents. Nevertheless, the potential of MOFs has been only numerically investigated without any experimental data from a real system. To fill this research gap, this work presents for the first time the experimental testing of a MOF material, aluminium fumarate, and how it can enhance the performance of adsorption desalination systems. A parametric study to investigate the effect of different parameters such as chilled water, adsorption cooling water, condensation cooling water, desorption heating water temperatures and half cycle time on the performance of the adsorption system has been conducted. The suitability of the aluminium fumarate system for adsorption desalination was also assessed through analysing the quality of water produced from the system. Finally, the performance of the aluminium fumarate was also compared to conventional adsorbents such as silica gel. The superior performance of aluminium fumarate highlights the potential of the material in adsorption desalination application.

Metal-organic framework materials for adsorption heat pumps

Adsorption technology offers a potential in vital applications like energy storage, cooling and heating, and water desalination which can be driven by low-grade or renewable heat sources leading to significant reduction in CO2 emissions. The adsorbent material is a key element in adsorption heat pump systems determining the performance, size and cost of such technology. Metal-organic frameworks (MOFs) are class of adsorbents with superior water uptake, high pore volume and surface area. This study describes the experimental testing of adsorption heat pumps using aluminium fumarate, CPO-27(Ni) and MIL-100(Fe) for various adsorption applications. Results showed that energy storage density of 1200 W h kg−1 was achieved using MIL-100(Fe) regenerated at 95°C, and cycle time of 90 min. For cooling applications, MIL-100(Fe) showed high specific cooling power of 226 W kg−1 at 95°C while aluminium fumarate produced 136 W kg−1 specific cooling power (SCP) at 90°C. Regarding water desalination, MIL-100(Fe) showed high water production rate specific daily water production (SDWP) of 19 m3 ton−1 day−1. For power generation, including a turbine in the adsorption system can increase the effective coefficient of performance (COP) of the adsorption cooling system by 22%. Integrating the adsorption cooling system with Organic Rankine Cycle (ORC) can produce an effective COP of 0.8.

Decorated graphene with aluminum fumarate metal organic framework as a superior non-toxic agent for efficient removal of Congo Red dye from wastewater

Nowadays, disposal of highly stable toxic dyes into the ecosystem and water sources has become a great concern for our health, while many attempts were conducted to remove these kinds of pollutants from the ecosystem through practical scientific protocols. Herein, for the first time, we decorated the graphene oxide (GO) and reduced graphene oxide (rGO) with the highly porous aluminum fumarate (AlF) metal organic framework (AlF MOF) toward efficient and high yield removal of the Congo Red (CR) dye ((3,3′-([1,1′-biphenyl]z-4,4′-diyl)bis(4-aminonaphthalene-1-sulfonic acid)) as a severely toxic and even carcinogenic substance from aqueous media. In this case, developed absorbers including AlF, AlF-GO and AlF-rGO were well-characterized through diverse analyses that confirmed their successful synthesis and also superior specific surface area and porosity, where their respective BET surface areas found to be 973.39, 917.79 and 951.88 m2. g−1. Additionally, outcome of further analyses showed that the experimental data are well fitted with Langmuir isotherm and pseudo-second-order kinetic model which show that the absorption process occur through chemisorption via uniform energetic absorption sites. Further evaluations showed that the AlF and its derived composites with GO and rGO can completely remove the CR dye at optimum conditions (more than 99% yield) and reach to the absorption capacity of about 93.45, 102.04 and 178.57 mg.g−1 for concentrations between 1–40 μg.mL−1 at optimum conditions, which highlight their superior sensitivity. Additionally, for the first time it was also reported that the AlF composite with GO is fully non-toxic.

Wire fin heat exchanger using aluminium fumarate for adsorption heat pumps

Adsorption heat pumps have faced major challenges in terms of their large size and capital cost caused by using conventional heat exchangers for adsorption beds and the poor performance of the currently used adsorbent materials such as silica gel and zeolite. This work experimentally and numerically investigates the performance of a wire finned heat exchanger compared to rectangular finned and microchannel heat exchangers. The microchannel heat exchanger experienced significantly high pressure drop almost 5 times that of the wire and rectangular finned heat exchangers. The two heat exchangers were packed with aluminium fumarate metal-organic framework (MOF) material where the finned wire heat exchanger had a superior performance. Then the performance of the wire finned heat exchanger packed with aluminium fumarate was investigated in terms of water uptake and surface temperature at various fin height (3.5, 7 and 14 mm), spacing (1, 2 and 3.5 mm) and tube diameter (6, 9 and 12 mm). The numerical model was validated using experimental work showing good agreement with deviation ranging from ±10.

In Situ Synthesis and Performance of Aluminum Fumarate Metal–Organic Framework Monolithic Adsorbent for Water Adsorption

The monolithic adsorbent is a key part of an adsorptive rotary dehumidification system. It is usually prepared by dip-coating the adsorbent on glass fiber paper. In this study, a new in situ strategy for synthesis of an aluminum fumarate (A520) metal–organic framework monolithic adsorbent on glass fiber paper is introduced. The influences of the mole ratio of fumaric acid to H2O, the reaction temperature and time on the crystal phase, the pore structure, and the adsorption performance of the monolithic adsorbent are systematically discussed. The morphology of the adsorbent was characterized by scanning electronic microscopy, and the adsorption and desorption performances were evaluated by dynamic vapor sorption and differential thermogravimetric analysis. The results showed that under the conditions of a mole ratio of fumaric acid to H2O of 0.02, reaction temperature of 50 °C, and reaction time of 60 min, the obtained A520 monolith exhibited the highest BET surface area (740.15 m2·g–1) and high adsorption capacity (0.3906 g·g–1). The monolithic adsorbent carries about 76% A520 powder with the advantages of a facile fabrication process, high adsorption capacity, rapid adsorption rate, and low desorption temperature, providing guidance for the fabrication of a highly efficient desiccant dehumidification wheel.

Synthesis of polyethylenimine-impregnated Al-fumarate metal-organic framework and its CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; adsorption characteristics

Carbon capture and storage (CCS) can effectively reduce CO2 emissions from fossil-fuel combustion and mitigate global warming. Among the many CCS technologies, solid-amine based CO2 adsorption exhibits simple operation, great environmental sustainability, and good adsorption performance under post-combustion conditions of humidity, high temperature, and low CO2 partial pressure. Solid amine is always composed of porous solid support and organic amine. However, the disadvantages of complex preparation limit the application of traditional support materials. Therefore, the preparation of a kind of support with convenient synthesis, low cost, and high performance is of great significance for the preparation of solid-amine CO2 adsorbent. In this study, a method for the rapid preparation of an aluminum fumarate metal-organic framework (AlFu) is proposed based on sodium fumarate as the source of the organic ligand and water as the reaction solvent. Post-treatment of AlFu is not required due to the good water solubility of the reactants. The synthesized materials were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) nitrogen adsorption/desorption, and thermogravimetric analysis (TGA) techniques. The results show that AlFu can be successfully synthesized at room temperature in 10 min. AlFu shows a typical porous morphology with a specific surface area of 828.44 m2/g. The TGA results show that AlFu is thermally stable up to 400°C. AlFu is a kind of superior solid-amine support material. Polyethylenimine (PEI) was then introduced into the AlFu support by an impregnation method to prepare solid-amine CO2 adsorbent, and the functionalized materials were characterized. The results show that the impregnation method can successfully introduce PEI into the AlFu framework. PEI modification did not destroy the crystal structure, but decreased the XRD characteristic peak intensity of AlFu. Increasing PEI loading leads to the agglomeration of the AlFu skeleton and the decrease of the specific surface area and pore volume of the samples. PEI modification will reduce the thermal stability of the material, but all samples showed good thermal stability below 200°C. Subsequently, the CO2 adsorption performance of the samples was investigated by TGA. The results showed that the optimum PEI content is 50 wt%, and the optimum adsorption temperature of PEI modified AlFu is 75°C, and that the highest CO2 adsorption capacity, 2.68 mmol/g, was obtained under optimum conditions. The CO2 adsorption kinetics onto PEI-AlFu with different PEI loadings was investigated by employing the pseudo-first/second-order kinetic models and fractional-order kinetic model. The results show the fractional-order kinetic model fitted well with the CO2 adsorption experiment data, and that the CO2 adsorption processes of PEI-AlFu were controlled by chemical reaction and physical transmission. Cyclic CO2 adsorption experiments revealed that PEI-AlFu has superior reproducibility after nine CO2 adsorption-desorption cycles. These results suggest that PEI-AlFu has high CO2 adsorption capacity and good reproducibility, and shows great potential for practical CO2 adsorption applications under post-combustion conditions.

Water adsorption studies on synthesized alkali-ions doped Al-fumarate MOFs and Al-fumarate + zeolite composites for higher water uptakes and faster kinetics

Abstract This paper presents molecular simulation and experimental investigation for water adsorption on aluminium fumarate (Al-fum) MOFs, alkali ions doped Al-fum MOF and Al-fum + CHA/AFI zeolite composites. The grand canonical Monte Carlo (GCMC) simulations have been carried out to calculate water-adsorption isotherms. Based on simulation results, the Al-fum MOFs are post-synthesized with (i) 5% Li-ions dopants and (ii) 10%, 30% and 50% CHA/AFI zeolites. The pore structure characteristics are performed by N 2 adsorption analysis. The water adsorption isotherms are conducted from 30 °C to 60 °C. The newly synthesized adsorbents show faster kinetics with higher water transfer (Δq) under adsorption-desorption conditions of an adsorption chiller. It is found that (i) 5% Li-ions doped Al-fum-MOF shows the Δq of 0.26 kg/kg, (ii). CHA-zeolite and Al-fum-MOF composite show the Δq of 0.25 kg/kg with 1.6 times faster kinetics, and (iii) AFI-zeolite and Al-fum-MOF composite show the Δq of 0.24 kg/kg with 1.2 times faster kinetics as compared to the original Al-fum-MOF adsorbent.