Influence of Hydronium Ions in Zeolites on Sorption

Eckstein, Sebastian; Hintermeier, Peter H.; Zhao, Ruixue; Baráth, Eszter; Shi, Hui; Liu, Yue; Lercher, Johannes A.

doi:10.1002/anie.201812184

Influence of Hydronium Ions in Zeolites on Sorption

Journal Article · 06 February 2019 · Angewandte Chemie (International Edition)

DOI:https://doi.org/10.1002/anie.201812184· OSTI ID:1507369

Eckstein, Sebastian ^[1]; Hintermeier, Peter H. ^[1]; Zhao, Ruixue ^[1]; Baráth, Eszter ^[1]; Shi, Hui ^[2]; ^[1]; ^[2]

Department of Chemistry and Catalysis Research Center, Technische Universität München, Lichtenbergstraße 4 85747 Garching Germany
Department of Chemistry and Catalysis Research Center, Technische Universität München, Lichtenbergstraße 4 85747 Garching Germany; Institute for Integrated Catalysis, Pacific Northwest National Laboratory, P.O. Box 999 Richland WA 99352 USA

In presence of sufficient concentrations of water, stable hydrated hydronium ions are formed in inorganic solid acids such as zeolites. In their presence larger organic molecules can only adsorb in the pore volume not occupied by hydronium ions. In consequence, the available pore volume decreases proportionally to their concentrations. The higher charge density (the increasing ionic strength) induced by increasing hydronium ion concentration in zeolite crystalline induces higher activity coefficients of adsorbed substrates, weakening the interactions between the organic part of the molecules, favoring instead interactions with polar groups. The insight allows linking a collective property such as hydrophilicity and hydrophobicity of zeolites to specific interactions on the molecular level.

Research Organization:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1507369

Report Number(s):: PNNL-SA-135460

Journal Information:: Angewandte Chemie (International Edition), Vol. 58, Issue 11; ISSN 1433-7851

Publisher:: Wiley

Country of Publication:: United States

Language:: English

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