An ab initio study of ethane conversion reactions on zeolites using the complete basis set composite energy method

Xiaobo Zheng, Paul Blowers

Research output: Contribution to journalArticle

37 Scopus citations

Abstract

Ab initio methods are used to study the transition state structures and activation energies of ethane cracking, hydrogen exchange, and dehydrogenation reactions catalyzed by a zeolite model cluster. The reactant and transition state structures are optimized by HF and MP2 methods and the final energies are calculated using a complete basis set composite energy method. The computed activation barriers are 71.39 kcal/mol for cracking, 31.39 kcal/mol for hydrogen exchange and 75.95 kcal/mol for dehydrogenation using geometries optimized with the MP2 method. The effects of cluster size and acidity on the reaction barriers are also investigated. The relationships between activation barriers and zeolite deprotonation energies for each reaction are proposed so that accurate activation energies can be obtained when using different zeolites as catalysts.

Original languageEnglish (US)
Pages (from-to)77-85
Number of pages9
JournalJournal of Molecular Catalysis A: Chemical
Volume229
Issue number1-2
DOIs
StatePublished - Mar 29 2005

Keywords

  • CBS method
  • Cluster approach
  • Ethane
  • Zeolite

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology
  • Physical and Theoretical Chemistry

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