Zeolite Y Research Articles

Silane functionalization on zeolite 13X surface for direct steam generation in a solid sorption heat pump

High-temperature steam has been directly generated from hot water based on a solid sorption heat pump system by employing silane functionalized zeolite 13X (XS). The adsorbent is prepared by a liquid phase grafting method to modify functional groups on the zeolite surface with a silane coupling agent. The static water contact angle (WCA) and surface functional groups are analyzed by optical contact angle measuring instruments and Fourier transform infrared spectroscopy (FTIR), respectively. Analytical results confirm the successful preparation of surface hydrophobic zeolite. The water adsorption capacity of XS is slightly less than that of 13X, while the overall adsorption heat remains almost constant. Dry air at 130 °C is utilized for the regeneration of the wet zeolite in cyclic experiments. Steam at 207 °C is generated from input hot water at 72 °C in a packed bed filled with XS-25 (zeolite 13X functionalized by a saline solution concentration of 25%). The thermal response during the steam generation process is accelerated by utilizing XS. The mass of steam product does not change during the generation with XS, whereas cyclic time is shortened. Moreover, XS facilitates the regeneration process by decreasing the heat demand for the removal of free water. System evaluation results show that a higher Sp (steam productivity) is obtained for XS than that for zeolite 13X. COPh (coefficient of performance for heating) and SHP (specific heating power) are elevated by 23.6% and 5.7% for XS compared with those for zeolite 13X, respectively.

Zeolite-containing photocatalysts immobilized on aluminum support by plasma electrolytic oxidation

The preparation and properties of zeolite-containing oxide coatings obtained by plasma electrolytic oxidation are investigated and discussed. Pure and Ce-exchanged natural (clinoptilolite) and synthetic (13X) zeolites are immobilized on aluminum support from silicate-based electrolyte. Obtained coatings are characterized with respect to their morphology, phase and chemical composition, photocatalytic activity and anti-corrosion properties. It is observed that all mentioned properties of obtained coatings are dependent on processing time and type of immobilized zeolite. Coatings with Ce-exchanged zeolite show higher photocatalytic activity and more effective corrosion protection than those with pure zeolite. The highest photocatalytic activity is observed for coatings processed in a pulsed DC regime for 30 min containing Ce-exchanged 13X zeolite, followed by those containing Ce-exchanged clinoptilolite. Pronounced anti-corrosion properties feature almost all samples containing Ce-exchanged 13X zeolite.

Prepared 13X Zeolite as a Promising Adsorbent for the Removal of Brilliant Blue Dye from Wastewater

The research discussed the possibility of adsorption of Brilliant Blue Dye (BBD) from wastewater using 13X zeolite adsorbent, which is considered a byproduct of the production process of potassium carbonate from Iraqi potash raw materials. The 13X zeolite adsorbent was prepared and characterized by X-ray diffraction that showed a clear match with the standard 13X zeolite. The crystallinity rate was 82.15% and the crystal zeolite size was 5.29 nm. The surface area and pore volume of the obtained 13X zeolite were estimated. The prepared 13X zeolite showed the ability to remove BBD contaminant from wastewater at concentrations 5 to 50 ppm and the removal reached 96.60% at the lower pollutant concentration. Adsorption measurements versus time showed 48.18% removal of the dye during just the first half-hour and the maximum removal closest to the removal at the equilibrium after one and half hour. Langmuir isotherm was described the adsorption equilibrium data with a maximum adsorption capacity of 93.46 mg/g and the kinetics data of the adsorption process was followed the pseudo-second-order.

Efficient production of polymer-grade propylene from the propane/propylene binary mixture using Cu-MOF-74 framework

We employ the Cu-MOF-74 framework for the separation of a propane/propylene mixed stream. Performing single and binary component breakthrough experiments demonstrates that this framework has a greater capacity and affinity for propylene relative to propane. A system model is implemented in Aspen AdsorptionTM and validated against experimental data. Implementation of this model for the case of industrially relevant propane/propylene separations shows that propylene can be efficiently purified into a polymer-grade level quality using the Cu-MOF-74 framework as an adsorbent. Moreover, reviewing key performance indices shows that the Cu-MOF-74 framework is more efficient for propane/propylene separation than the state-of-the-art commercial adsorbent, i.e., zeolite 13X. Using zeolite 13X as the adsorbent, the recovery and productivity for propylene product are 1.00 mol.kg−1.h−1 and 74.63%, respectively; the corresponding values for Cu-MOF-74 are 2.36 mol.kg−1.h−1 and 78.68%, respectively. This highlights the importance of applying novel frameworks for challenging industrial separation applications.

High Performance Mixed-Matrix Electrospun Membranes for Ammonium Removal from Wastewaters.

Mixed-matrix electrospun membranes were developed to investigate ammonium removal from low ammonium concentration wastewaters for the first time. Particles derived from the inexpensive zeolite 13X were successfully incorporated into polyethersulfone (PES) matrices. The fabricated mixed-matrix electrospun membranes demonstrate high ammonium removal capacity reaching over 55 mg/gzeolite, more than 2.5 times higher than the previously fabricated mixed-matrix membranes via non-solvent induced phase inversion. Moreover, the membranes fabricated exhibit high permeability and ease of regeneration. Over 90% of total ammonium nitrogen (TAN) can be removed from low TAN wastewaters such as aquaculture wastewaters. In addition to zeolite 13X, other zeolite particles including zeolite Y, zeolite 3A and 4A were also incorporated into the membrane matrix. The inexpensive zeolite 13X show the highest ammonium exchange capacity. Particle type, loading and the level of its dispersion all affect TAN removal capacity.

Continuous methane to ethane conversion using gaseous oxygen on ceria-based Pd catalysts at low temperatures

Methane upgrading into more valuable chemicals has been a promising challenge. It was previously reported that highly oxidized Pd/CeO2 could produce ethane from methane. Here, we enhanced the ethane productivity by controlling oxygen mobility of the catalyst support and adding water adsorbents. Pd/Ce1-xPdxO2-y catalyst, in which Pd atom was doped at the ceria support, showed enhanced oxygen activation and oxygen transfer, improving the ethane productivity from 0.04 molC2H6/mmolSurfacePd/h in Pd/CeO2 to 0.57 molC2H6/mmolSurfacePd/h in Pd/Ce1-xPdxO2-y. In order to remove the water produced from methane oxidation, zeolite 13X was physically mixed with Pd/Ce1-xPdxO2-y. The water adsorbent could increase the ethane production significantly, especially at low temperatures. The ethane yield of 0.30 % could be obtained at 290 °C using gaseous O2 as an oxidant. This work can provide useful ways to enhance the yield of value-added products in oxidative methane conversion.

Investigation of Water Vapour Harvesting Unit Using Solar Energy

water-harvesting unit is built and the effects of design parameters are studied experimentally and theoretically under Baghdad conditions (33. 3°N, 44.33° E). The unit consists of desiccant materials contained in many trays that enclosed in a metal container covered by a glass cover. The desiccant materials aim to adsorb the water vapor that associated with the air, an axial fan is used to blow the ambient air over the desiccant. The unit container is built from aluminum of 0.6 mm thickness; the dimensions of the container are 27 cm wide, 93cm length and 10 cm height. Two gets are installed in the unit for the inlet and outlet of air. The front face of the container is covered by a glass cover of 4 mm thickness. Different types of desiccant materials are used to adsorb the water vapour from the air, namely; silica gel powder, silica gel pellets, zeolite 13X, zeolite 3A and MCM-41 Nano powder. The effect of the mass flow rate of air over the desiccant materials and the types of desiccant material on the amount of freshwater production is studied in this work. Tóth model is used to build a mathematical of the adsorption/desorption process. The mathematical model aims to cover the performance of the water-harvesting unit around the year. The results show that the maximum daily production of the water-harvesting unit using MCM-41 is 0.5 kgw/kgads when the mass flow rate of air is 14 kg/hr, as the mass flow rate of air increases more than 14 kg/hr the daily water production reduces. The use of other desiccant materials like Zeolites and silica gels shows encourage results in the daily production of water of less than 0.1 kgw/kgads. The mathematical modelling of the water-harvesting unit shows the maximum water production about 0.55 kgw/kgads in December. The error between the experimental and mathematical models for daily water production is in the range of 12.5 to 17.8% for the desiccant materials used in this work.

Effect of Si/Al Ratio in the Faujasite Structure on Adsorption of Methane and Nitrogen: A Molecular Dynamics Study

AbstractAdsorption of methane and nitrogen, in pure and mixture states, on faujasite (FAU) zeolite was investigated by molecular dynamics (MD) simulation. FAU zeolite with Si/Al ratios of 1, 2, and 3 was tested to evaluate the effect of changes in the zeolite structure. Adsorption isotherms of methane and nitrogen were derived using MD simulation with COMPASS force field at various temperatures and pressures and the results were compared with experimental data. Methane/nitrogen selectivity was calculated to analyze the separation performance of FAU zeolite. Under all tested conditions, the calculated selectivities were higher than 2, which was in the acceptable range for separation. Diffusivity of the gases in the zeolite structure was assessed using mean square displacement analysis. The results demonstrated that a lower Si/Al ratio in the FAU structure yield higher methane adsorption.

Survey Summary on Salts Hydrates and Composites Used in Thermochemical Sorption Heat Storage: A Review

To improve the proficiency of energy systems in addition to increasing the usage of renewable energies, thermal energy storage (TES) is a strategic path. The present literature review reports an overview of the recent advancements in the utilization of salt hydrates (single or binary mixtures) and composites as sorbents for sorption heat storage. Starting by introducing various heat storage systems, the operating concept of the adsorption TES was clarified and contrasted to other technologies. Consequently, a deep examination and crucial problems related to the different types of salt hydrates and adsorbents were performed. Recent advances in the composite materials used in sorption heat storage were also reviewed and compared. A deep discussion related to safety, price, availability, and hydrothermal stability issues is reported. Salt hydrates display high theoretical energy densities, which are promising materials in TES. However, they show a number of drawbacks for use in the basic state including low temperature overhydration and deliquescence (e.g., MgCl2), high temperature degradation, sluggish kinetics leading to a low temperature rise (e.g., MgSO4), corrosiveness and toxicity (e.g., Na2S), and low mass transport due to the material macrostructure. The biggest advantage of adsorption materials is that they are more hydrothermally stable. However, since adsorption is the most common sorption phenomenon, such materials have a lower energy content. Furthermore, when compared to salt hydrates, they have higher prices per mass, which reduces their appeal even further when combined with lower energy densities. Economies of scale and the optimization of manufacturing processes may help cut costs. Among the zeolites, Zeolite 13X is among the most promising. Temperature lifts of 35–45 °C were reached in lab-scale reactors and micro-scale experiments under the device operating settings. Although the key disadvantage is an excessively high desorption temperature, which is problematic to attain using heat sources, for instance, solar thermal collectors. To increase the energy densities and enhance the stability of adsorbents, composite materials have been examined to ameliorate the stability and to achieve suitable energy densities. Based on the reviewed materials, MgSO4 has been identified as the most promising salt; it presents a higher energy density compared to other salts and can be impregnated in a porous matrix to prepare composites in order to overcome the drawbacks connected to its use as pure salt. However, due to pore volume reduction, potential deliquescence and salt leakage from the composite as well as degradation, issues with heat and mass transport can still exist. In addition, to increase the kinetics, stability, and energy density, the use of binary salt deposited in a porous matrix is suitable. Nevertheless, this solution should take into account the deliquescence, safety, and cost of the selected salts. Therefore, binary systems can be the solution to design innovative materials with predetermined sorption properties adapted to particular sorption heat storage cycles. Finally, working condition, desorption temperature, material costs, lifetime, and reparation, among others, are the essential point for commercial competitiveness. High material costs and desorption temperatures, combined with lower energy densities under normal device operating conditions, decrease their market attractiveness. As a result, the introduction of performance metrics within the scientific community and the use of economic features on a material scale are suggested.

Chitosan/Zeolite Composite Aerogels for a Fast and Effective Removal of Both Anionic and Cationic Dyes from Water.

Organic dyes are extensively used in many industrial sectors, and their uncontrolled disposal into wastewaters raises serious concerns for environmental and human health. Due to the large variety of such pollutants, an effective remediation strategy should be characterized by a broad-spectrum efficacy. A promising strategy is represented by the combination of different adsorbent materials with complementary functionalities to develop composite materials that are expected to remove different contaminants. In the present work, a broad-spectrum adsorbent was developed by embedding zeolite 13X powder (ZX) in a chitosan (CS) aerogel (1:1 by weight). The CS–ZX composite adsorbent removes both anionic (indigo carmine, IC) and cationic (methylene blue, MB) dyes effectively, with a maximum uptake capacity of 221 mg/g and 108 mg/g, respectively. In addition, the adsorption kinetics are rather fast, with equilibrium conditions attained in less than 2 h. The composite exhibits good mechanical properties in both dry and wet state, which enables its handling for reusability purposes. In this regard, preliminary tests show that the full restoration of the IC removal ability over three adsorption–desorption cycles is achieved using a 0.1 M NaOH aqueous solution, while a 1 M NaCl aqueous solution allows one to preserve >60% of the MB removal ability.

Dynamic modeling and analysis of an advanced adsorption-based osmotic heat engines to harvest solar energy

Osmotic heat engine (OHE) is a promising technology to harvest low-grade heat from renewable energy source. In previous studies of OHEs, the features of actual heat source and application scenarios are usually ignored. Here we present an advanced adsorption-based osmotic heat engine to harvest solar energy and a dynamic model for such energy utilization system is established. Firstly, the dynamic characteristics of the OHE from transient to cyclic-steady state is investigated. There exist an optimal adsorption/desorption time to maximize the electric power and efficiency simultaneously. Higher working concentration elevates the electric power and efficiency. Larger direct solar irradiation intensity upgrades the electric power while hinders the efficiency. Then a practical simulation of a small sized OHE harvesting solar energy to generate electricity during a day is carried out and the effects of some important parameters on the system under transient state are analyzed. The results indicate that there is a best number of cycles the system performs during a day to maximize the average electric power and efficiency. Among the ten selected adsorbents, MIL-101 leads to the largest average electric power of 41.8 W and Zeolite 13X leads to the highest electric efficiency of 1.04% when the number of cycles is set as 60 and 7 mol/kg NaCl is employed as working solution.

Porous Polyethylene-Supported Zeolite Carriers for Improved Wastewater Deammonification

Wastewater treatment is increasingly important as anthropogenic activities continue to stress our water systems. Ammonium is one of the most common pollutants in wastewater streams and is typically oxidized to nitrate during treatment, which still results in the discharge of reactive nitrogen to the environment. Anaerobic ammonium oxidation (anammox) can completely remove reactive nitrogen, forming dinitrogen, and also decreases the cost of ammonium removal compared to conventional activated sludge wastewater treatment systems. Anammox faces challenges in mainstream implementation, however, as a result of the slow growth rates of anammox bacteria, narrow ideal growth conditions, and competition with other taxa. Addition of zeolite, such as faujasite, into low ammonium waste streams improves ammonium removal and locally concentrates ammonium ions, which in turn can improve the proliferation of anammox bacteria. Here, we report the development of a scalable approach to plastic carriers for potential use in mainstream anammox reactors that combines the processability of thermoplastics and the ammonium sequestration ability of zeolites. Carriers were prepared by melt-blending polyethylene (PE), microparticulate zeolite 13X (Z13X, a faujasite), and a sacrificial poly(ethylene oxide) (PEO) template. Removal of the PEO template by solvent etching in water exposed a percolating pore network within the PE support structure and the particulate zeolite trapped within the exterior. A pore size in the range of 10–25 μm was typical, with zeolite loadings as high as 45% by mass in the final product. The hybrid inorganic–polymer carriers were highly effective in sequestering ammonium, capable of removing >75% of ammonium from a 45 mg/L TAN (total ammonium nitrogen) aqueous environment in 24 h at less than 1% mass loading of carriers as compared to solution mass. Ammonium removal by ion exchange was confirmed by spectrophotometric methods and by energy-dispersive X-ray spectroscopy, and the kinetics of ammonium sequestration were determined to be zeroth-order with respect to ammonium and first-order with respect to zeolite. The materials described in this article are expected to find utility in future bioreactor development.

Rapid Cycling Thermal Swing Adsorption Apparatus: Commissioning and Data Analyses for Water Adsorption of Zeolites 4A and 13X Over 2000 Cycles

Evaluation of adsorbent integrity over thousands of cycles is necessary to establish the service time and sustainability of adsorbents employed in industrial dehydration. Herein, an adsorption apparatus for rapidly cycling multiple adsorbents through a thermal swing adsorption process is introduced with results for 2000 cycles. This apparatus has eight sample cells arranged in parallel, which are embedded in an aluminum block for rapid heating and cooling. At the outlet of each cell, the water content and temperatures are measured using capacitance relative humidity sensors, which incorporate resistance thermometers. The analysis of the breakthrough curves generated for each adsorbent gives inference into the change in water uptake capacity over continuous cycling. To handle the large sets of data generated by this instrument, an automated analysis program was implemented. To demonstrate the functionality of the instrument, zeolites 4A and 13X were cycled in a thermal swing process over 2000 cycles and the change in the uptake capacity was monitored by the analysis of the breakthrough plots for each cycle. Furthermore, the results of the breakthrough analyses were verified with the thermogravimetric analysis of the adsorbents. From these experiments, zeolites 4A and 13X were observed to lose 7 ± 3 and 19 ± 7% of the adsorption capacity, respectively.

Gas Porosimetry by Gas Adsorption as an Efficient Tool for the Assessment of the Shaping Effect in Commercial Zeolites.

A set of three commercial zeolites (13X, 5A, and 4A) of two distinct shapes have been characterized: (i) pure zeolite powders and (ii) extruded spherical beads composed of pure zeolite powders and an unknown amount of binder used during their preparation process. The coupling of gas porosimetry experiments using argon at 87 K and CO2 at 273 K allowed determining both the amount of the binder and its effect on adsorption properties. It was evidenced that the beads contain approximately 25 wt% of binder. Moreover, from CO2 adsorption experiments at 273 K, it could be inferred that the binder present in both 13X and 5A zeolites does not interact with the probe molecule. However, for the 4A zeolite, pore filling pressures were shifted and strong interaction with CO2 was observed leading to irreversible adsorption of the probe. These results have been compared to XRD, IR spectroscopy, and ICP-AES analysis. The effect of the binder in shaped zeolite bodies can thus have a crucial impact on applications in adsorption and catalysis.

Parametric Analysis of a Moving Bed Temperature Swing Adsorption (MBTSA) Process for Postcombustion CO2 Capture

We simulate a moving bed temperature swing adsorption (MBTSA) process to capture CO2 in postcombustion context using zeolite 13X as adsorbent. Experimental adsorption isotherms for CO2 and N2 were ...

Phenolic Preservative Removal from Commercial Insulin Formulations Reduces Tissue Inflammation while Maintaining Euglycemia.

Background: Exogenous insulin therapy requires stabilization of the insulin molecule, which is achieved through the use of excipients (e.g., phenolic preservatives (PP)) that provide protein stability, sterility and prolong insulin shelf life. However, our laboratory recently reported that PP, (e.g., m-creosol and phenol) are also cytotoxic, inducing inflammation and fibrosis. Optimizing PP levels through filtration would balance the need for insulin preservation with PP-induced inflammation. Method: Zeolite Y (Z-Y), a size-exclusion-based resin, was employed to remove PP from commercial insulin formulations (Humalog) before infusion. Results: PP removal significantly decreased cell toxicity in vitro and inflammation in vivo. Infusion site histological analysis after a 3 day study demonstrated that leukocyte accumulation increased with nonfiltered preparations but decreased after filtration. Additional studies demonstrated that a Z-Y fabricated filter effectively removed excess PP such that the filtered insulin solution achieved equivalent glycemic control in diabetic mice when compared to nonfiltered insulin. Conclusion: This approach represents the proof of concept that using Z-Y for in-line PP removal assists in lowering inflammation at the site of insulin infusion and thus could lead to extending the functional lifespan of insulin infusion sets in vivo.

Mechanically Coherent Zeolite 13X/Chitosan Aerogel Beads for Effective CO2 Capture.

The constant increase of CO2 concentration in the atmosphere is recognized worldwide to severely impact the environment and human health. Zeolites possess a high adsorption capacity for CO2 removal, but their powdery form prevents their use in many practical applications. When binding agents are used, a partial occlusion of the porosity can severely compromise the adsorption capacity. In this regard, a great challenge is producing compact composite adsorbents while maintaining a high specific surface area to preserve the pristine performance of zeolites. Here, this goal was achieved by preparing beads with a high content of zeolite 13X (up to 90 wt %) using a chitosan aerogel as the binding agent. A facile preparation procedure based on the freeze-drying of hydrogel beads obtained by phase inversion led to a peculiar microstructure in which a very fine polymeric framework firmly embeds the zeolite particles, providing mechanical coherence and strength (compressive strain >40% without bead fragmentation, deformation <20% under 1 kgf-load) and yet preserving the powder porosity. This allowed us to fully exploit the potential of the constituents, reaching a high specific surface area (561 m2 g–1) and excellent CO2 uptake capacity (4.23 mmol g–1) for the sample at 90% zeolite. The beads can also be reused after being fully regenerated by means of a pressure swing protocol at room temperature.

Molecular dynamics study on water and ions transport mechanism in nanometer channel of 13X zeolite

Understanding the atomistic transport within nanoporous zeolite is essential in a broad field. Herein, molecular dynamics was systematically utilized to elucidate the migration mechanism of pure water and NaCl solution in the 13X zeolite. At nano-scale level, molecular simulation clearly distinguishes the wetting and saturating stages of water transport in porous zeolite. The interior skeleton of 13X zeolite provides plenty of oxygen sites with strong polarity, which attracts frontier water molecules to infiltrate the hydrophilic zeolite surface rapidly in nearly 2 ns. The ladder-like ingress curve for water molecules highlight the discontinuous remain-jump wetting process that is induced by the competition adsorption with oxygen sites between the subsequent water molecules and the front water molecules. Initial wetting on interior surface reduces significantly the permeability of subsequent water transport. Furthermore, the penetrated water molecules, competing oxygen sites with extra-framework cations, can cause cations to exhibit different hydration behavior. Additionally, the permeability of water flux throughout zeolite channel is reduced by 10% as the Na+ and Cl- are incorporated in solution. Na+ with large hydration shells are sieved by bottlenecks formed by the windows of 12-ring structure with a diameter of 7.38 Å. The accumulated Na+ at the entrance region associate with neighboring water molecules and hydroxyl oxygen atoms to form hydrated clusters and ionic pairs, which plays as a physical barrier in blocking water transport. Decoding of the transport mechanism of water and salt solutions in zeolites at the molecular level facilitates breaking the existing upper limit of energy storage density and water treatment efficiency.

Ag-exchanged mesoporous chromium terephthalate with sulfonate for removing radioactive methyl iodide at extremely low concentrations in humid environments

The development of efficient adsorbents to remove radioactive methyl iodide (CH3I) in humid environments is crucial for air purification after pollution by nuclear power plant waste. In this work, we successfully prepared a post-synthetic covalent modified MIL-101 with a sulfonate group followed by the ion-exchange of Ag (I), which is well characterized by diffuse reflectance FT-IR spectroscopy, X-ray photoelectron spectroscopy (XPS) and the hydrophobic index (HI). After modification of the MOFs, we applied functionalized MIL-101 obtained by either one-pot synthesis (MIL-101-SO3Ag) or a post-synthetic modification process (MIL-101-RSO3Ag, R = NH(CH2)3) to remove the CH3I at an extremely low concentration (0.31 ppm) in an environment with very high relative humidity (RH 95%). Enhanced hydrophobicity of the surface-modified MIL-101 was evaluated by examining the HI with the competitive adsorption of water and cyclohexane vapor, with a high surface area maintained, as confirmed by Ar physisorption. Interestingly, the post-synthetically modified MIL-101-RSO3Ag showed exceptional adsorption performance as determined by its decontamination factor (DF = 195,350) at 303 K and RH 95%. This performance was in comparison to Ag (I)-exchanged 13X zeolite and MIL-101-SO3Ag, which include much higher amounts of Ag. Furthermore, MIL-101-RSO3Ag retained ~94–100% of its fresh adsorbent performance during five cycle repetitions.

Study and characterization of potential adsorbent materials for the design of the hydrogen isotopes extraction and analysis system

One of the most challenging tasks in the design of the inner fuel cycle system lies in the effective design of Tritium Extraction System (TES), which involves proper extraction and purification of tritium in a fusion reactor. A prototype Hydrogen Isotopes Recovery System (HIRS) is being developed to validate the concepts for tritium extraction by adsorption mass transfer mechanism. The two main systems of HIRS are Atmospheric Molecular Sieve Bed (AMSB) adsorber and Cryogenic Molecular Sieve Bed (CMSB) adsorber. AMSB removes ppm levels of water vapour while CMSB removes ppm levels of hydrogen isotopes, oxygen and nitrogen gas from Helium purge gas. Selection of appropriate adsorbents for the HIRS is important for its efficient functioning. Adsorbents, namely, Zeolites 3A, 4A, 5A, 13X and Activated Carbon have been studied in detail at cryogenic temperatures to understand their surface characteristics and adsorption potential. In this work, we have generated the adsorption isotherms for hydrogen isotopes on potential adsorbents using a volumetric adsorption apparatus for a wide range of pressure from 1 Pa to 105 Pa. The BET and DFT models are applied for the determination of the textural properties of the adsorbents and the Langmuir-Freundlich composite model is used to fit the isotherm data. The parameters of the model were determined using nonlinear regression analysis. The enthalpy of adsorption is determined and is in the range of 8–11.5 kJ/mol for the adsorbate loadings corresponding to the partial pressure of hydrogen isotopes of ∼ 50–500 Pa in the TES. At low pressures of hydrogen isotopes, the free energy plot followed Henry’s law. The isotherms and enthalpy of adsorption clearly indicate reversible physisorption and monolayer formation of hydrogen isotopes on the potential adsorbents. Amongst hydrogen and deuterium, hydrogen is more strongly adsorbed on Zeolites 4A, whereas deuterium is more strongly adsorbed on Zeolites 13X. In case of activated carbon, no isotopic selectivity was observed. This study facilitates the selection of potential adsorbents for the CMSB and quantification of the parameters associated with the adsorbents.