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The significance of a second adsorption phase with weakly adsorbed species for the calculation of the surface concentrations of a mixture: methanol–DME and methanol–ethene adsorption in SAPO-34

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Abstract

With the calorimetric (adsorption heat versus coverage) curve also measured together with the adsorption isotherm, the simultaneous use of both curves showed that there were two phases of adsorption in the adsorption of methanol, dimethyl ether, ethene and propane in SAPO-34. The dual-site Langmuir equation gave good fits to the adsorption data to support the interpretation that a second (type 2) adsorption phase occurred in the high-pressure region in addition to a first (type 1) adsorption phase on the acid sites at lower pressures. Adsorption experiments and calculations using binary gas mixtures showed that due to the existence of two types of adsorption, the multicomponent Langmuir isotherm equation (Langmuir competitive adsorption model) calculated incorrect surface concentrations when the concentrations were high. In contrast, the ideal adsorbed solution theory (IAST) calculated correct surface concentrations in the adsorption of mixtures.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (21173125).

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Authors and Affiliations

  1. Key Lab Orogen Belts Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing, 100871, China

    Fei Wang

  2. Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China

    Yasukazu Kobayashi, Yuxin Li, Yao Wang & Dezheng Wang

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  1. Fei Wang
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  2. Yasukazu Kobayashi
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  3. Yuxin Li
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  4. Yao Wang
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  5. Dezheng Wang
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Correspondence to Dezheng Wang.

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Wang, F., Kobayashi, Y., Li, Y. et al. The significance of a second adsorption phase with weakly adsorbed species for the calculation of the surface concentrations of a mixture: methanol–DME and methanol–ethene adsorption in SAPO-34. Res Chem Intermed 41, 9561–9573 (2015). https://doi.org/10.1007/s11164-015-1981-x

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  • DOI: https://doi.org/10.1007/s11164-015-1981-x

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