Understanding Brønsted-Acid Catalyzed Monomolecular Reactions of Alkanes in Zeolite Pores by Combining Insights from Experiment and Theory
Abstract
Acidic zeolites are effective catalysts for the cracking of large hydrocarbon molecules into lower molecular weight products required for transportation fuels. However, the ways in which the zeolite structure affects the catalytic activity at Brønsted protons are not fully understood. One way to characterize the influence of the zeolite structure on the catalysis is to study alkane cracking and dehydrogenation at very low conversion, conditions for which the kinetics are well defined. To understand the effects of zeolite structure on the measured rate coefficient (kapp), it is necessary to identify the equilibrium constant for adsorption into the reactant state (Kads-H+) and the intrinsic rate coefficient of the reaction (kint) at reaction temperatures, since kapp is proportional to the product of Kads-H+ and kint. We show that Kads-H+ cannot be calculated from experimental adsorption data collected near ambient temperature, but can, however, be estimated accurately from configurational-bias Monte Carlo (CBMC) simulations. Finally, using monomolecular cracking and dehydrogenation of C3–C6 alkanes as an example, we review recent efforts aimed at elucidating the influence of the acid site location and the zeolite framework structure on the observed values of kapp and its components, Kads-H+ and kint.
- Authors:
-
- Univ. of California, Berkeley, CA (United States). Dept. of Chemical and Biomolecular Engineering; Ghent Univ., Zwijnaarde (Belgium). Center for Molecular Modeling
- Univ. of California, Berkeley, CA (United States). Dept. of Chemical and Biomolecular Engineering; Stanford Univ., CA (United States). Dept. of Chemical Engineering
- Ohio State Univ., Columbus, OH (United States). William G. Lowrie Dept. of Chemical and Biomolecular Engineering
- Ghent Univ., Zwijnaarde (Belgium). Center for Molecular Modeling
- Univ. of California, Berkeley, CA (United States). Dept. of Chemistry
- Univ. of California, Berkeley, CA (United States). Dept. of Chemical and Biomolecular Engineering
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1571097
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- ChemPhysChem
- Additional Journal Information:
- Journal Volume: 19; Journal Issue: 4; Journal ID: ISSN 1439-4235
- Publisher:
- ChemPubSoc Europe
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; activation enthalpy; activiation entropy; adsorption; confinement; zeolites
Citation Formats
Van der Mynsbrugge, Jeroen, Janda, Amber, Lin, Li-Chiang, Van Speybroeck, Veronique, Head-Gordon, Martin, and Bell, Alexis T. Understanding Brønsted-Acid Catalyzed Monomolecular Reactions of Alkanes in Zeolite Pores by Combining Insights from Experiment and Theory. United States: N. p., 2017.
Web. doi:10.1002/cphc.201701084.
Van der Mynsbrugge, Jeroen, Janda, Amber, Lin, Li-Chiang, Van Speybroeck, Veronique, Head-Gordon, Martin, & Bell, Alexis T. Understanding Brønsted-Acid Catalyzed Monomolecular Reactions of Alkanes in Zeolite Pores by Combining Insights from Experiment and Theory. United States. https://doi.org/10.1002/cphc.201701084
Van der Mynsbrugge, Jeroen, Janda, Amber, Lin, Li-Chiang, Van Speybroeck, Veronique, Head-Gordon, Martin, and Bell, Alexis T. Thu .
"Understanding Brønsted-Acid Catalyzed Monomolecular Reactions of Alkanes in Zeolite Pores by Combining Insights from Experiment and Theory". United States. https://doi.org/10.1002/cphc.201701084. https://www.osti.gov/servlets/purl/1571097.
@article{osti_1571097,
title = {Understanding Brønsted-Acid Catalyzed Monomolecular Reactions of Alkanes in Zeolite Pores by Combining Insights from Experiment and Theory},
author = {Van der Mynsbrugge, Jeroen and Janda, Amber and Lin, Li-Chiang and Van Speybroeck, Veronique and Head-Gordon, Martin and Bell, Alexis T.},
abstractNote = {Acidic zeolites are effective catalysts for the cracking of large hydrocarbon molecules into lower molecular weight products required for transportation fuels. However, the ways in which the zeolite structure affects the catalytic activity at Brønsted protons are not fully understood. One way to characterize the influence of the zeolite structure on the catalysis is to study alkane cracking and dehydrogenation at very low conversion, conditions for which the kinetics are well defined. To understand the effects of zeolite structure on the measured rate coefficient (kapp), it is necessary to identify the equilibrium constant for adsorption into the reactant state (Kads-H+) and the intrinsic rate coefficient of the reaction (kint) at reaction temperatures, since kapp is proportional to the product of Kads-H+ and kint. We show that Kads-H+ cannot be calculated from experimental adsorption data collected near ambient temperature, but can, however, be estimated accurately from configurational-bias Monte Carlo (CBMC) simulations. Finally, using monomolecular cracking and dehydrogenation of C3–C6 alkanes as an example, we review recent efforts aimed at elucidating the influence of the acid site location and the zeolite framework structure on the observed values of kapp and its components, Kads-H+ and kint.},
doi = {10.1002/cphc.201701084},
journal = {ChemPhysChem},
number = 4,
volume = 19,
place = {United States},
year = {Thu Dec 14 00:00:00 EST 2017},
month = {Thu Dec 14 00:00:00 EST 2017}
}
Web of Science
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