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Sorption of nitrogen, oxygen, and argon in Cd (II) exchanged zeolite X: volumetric equilibrium adsorption and grand canonical Monte Carlo study

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Abstract

The adsorption of nitrogen, oxygen and argon has been studied in cadmium (II) cations exchanged zeolite X at 288.2 and 303.2 K. Experimentally measured adsorption isotherms are compared with theoretically calculated data using grand canonical Monte Carlo (GCMC) simulation. Nitrogen showed higher adsorption capacity and selectivity than oxygen and argon in these zeolite samples. The cadmium exchanged zeolite X was showed that increased adsorption capacity for nitrogen, oxygen, and argon with increase in Cd (II)-exchange levels, indicating as charge density increases adsorption capacity also increase. Isosteric heat of adsorption data showed stronger interactions of nitrogen molecules with cadmium cations in zeolite samples. These observations have been explained in terms of higher electrostatic interaction of nitrogen with extra framework zeolite cations. The selectivity of oxygen over argon is explained in terms of its higher interaction with Cd (II)-exchanged zeolites than argon molecules. The selectivity of N2/O2 of cadmium-exchanged zeolite X is better than only sodium containing zeolite-X. Heats of adsorption and adsorption isotherms were also calculated using GCMC simulation algorithm. Simulation studies expectedly show the proximity of nitrogen molecules to the locations of extra framework sodium and cadmium cations.

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Acknowledgments

We greatly admire the financial assistance and support from Council of Scientific and Industrial Research (CSIR), New Delhi. R. S. P. thanks to CSIR, New Delhi, India for financial assistance in the form of senior research fellowship. We also thank to Dr. Alexandra Simperler and Dr. James Wescott, Accerlys Inc. E. U.

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Author notes

  1. Jince Sebastian

    Present address: Reliance Technology Group, Reliance Industries Limited, P. O. Petrochemicals, Vadodara, 391 346, India

Authors and Affiliations

  1. Discipline of Inorganic Materials and Catalysis, Central Salt and Marine Chemicals Research Institute, Bhavnagar, 364 002, India

    Renjith S. Pillai, Jince Sebastian & Raksh V. Jasra

  2. Reliance Technology Group, Reliance Industries Limited, P. O. Petrochemicals, Vadodara, 391 346, India

    Raksh V. Jasra

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  1. Renjith S. Pillai
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  2. Jince Sebastian
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  3. Raksh V. Jasra
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Correspondence to Raksh V. Jasra.

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Pillai, R.S., Sebastian, J. & Jasra, R.V. Sorption of nitrogen, oxygen, and argon in Cd (II) exchanged zeolite X: volumetric equilibrium adsorption and grand canonical Monte Carlo study. J Porous Mater 18, 113–124 (2011). https://doi.org/10.1007/s10934-010-9362-8

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  • DOI: https://doi.org/10.1007/s10934-010-9362-8

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