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Alkene adsorption and cracking on acidic zeolites – A gradual process of understanding

Journal Article · · Microporous and Mesoporous Materials
 [1];  [2];  [3]
  1. Technical University of Munich (Germany)
  2. Technical University of Munich (Germany); Yale University, New Haven, CT (United States)
  3. Technical University of Munich (Germany); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Cracking of light alkenes on solid acids and, in particular on zeolites, is ubiquitous in refineries. Different zeolite framework topologies in the catalysts used provide spatial constraints for reactants and products, leading to discrete reaction routes and varying selectivities. The conversion of alkenes in cracking proceeds either via monomolecular or bimolecular reaction pathways. In both routes, the reacting alkene adsorbs first on Brønsted acid sites forming the initial state (e.g., π-complex, carbenium ion or alkoxide), followed by β-cleavage in the carbenium transition state, generating a smaller alkene and a carbenium ion (monomolecular route) or forming a dimer by alkene addition that cracks subsequently (bimolecular route). The current state of understanding alkene sorption and cracking is critically discussed in this paper and four questions are formulated that may be the central questions from our perspective in further developing new generations of catalysts and processes for alkene conversion.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)
Grant/Contract Number:
AC05-76RL01830; FG02-01ER15183
OSTI ID:
2221924
Alternate ID(s):
OSTI ID: 2000644
Report Number(s):
PNNL-SA--186278
Journal Information:
Microporous and Mesoporous Materials, Journal Name: Microporous and Mesoporous Materials Vol. 358; ISSN 1387-1811
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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