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Cluster and Periodic Calculations of the Ethene Protonation Reaction Catalyzed by theta‐1 Zeolite: Influence of Method, Model Size, and Structural Constraints
Author(s) -
Boronat Mercè,
ZicovichWilson Claudio M.,
Viruela Pedro,
Corma Avelino
Publication year - 2001
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/1521-3765(20010316)7:6<1295::aid-chem1295>3.0.co;2-s
Subject(s) - protonation , catalysis , zeolite , cluster (spacecraft) , chemistry , relaxation (psychology) , activation energy , cluster size , computational chemistry , chemical physics , organic chemistry , electronic structure , ion , social psychology , psychology , computer science , programming language
The protonation of ethene by three different acid sites of theta‐1 zeolite was theoretically studied to analyze the extent and relevance of the following aspects of heterogeneous catalysis: the local geometry of the Brønsted acid site in a particular zeolite, the size of the cluster used to model the catalyst, the degree of geometry relaxation around the active site, and the effects related to medium‐ and long‐range interactions between the reaction site and its environment. It has been found that while the reaction energy is very sensitive to the local geometry of the site, the activation energy is mainly affected by the methodology used and by electrostatic effects on account of the carbocationic nature of the transition state.