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Kinetics of the reactions of the light alkenes over SAPO-34

Paper ID Volume ID Publish Year Pages File Format Full-Text
43574 45977 2008 7 PDF Available
Title
Kinetics of the reactions of the light alkenes over SAPO-34
Abstract

Many petrochemical processes produce light olefin byproducts that can be used to produce propene. This study reports the kinetics of the reactions of ethene, propene and n-butene isomers over a SAPO-34 catalyst at 450 °C and different space velocities and discusses suitable modes of reaction to maximize propene yield. The shape selectivity of SAPO-34 prevented the formation of i-butene and high alkenes. When a single alkene (ethene, propene, or n-butene) was used as the reactant, the other alkenes were rapidly produced by dimerization and cracking such that the final compositions of the light alkenes were close to the equilibrium composition, with propene as the main species. Hydrogen transfer reactions to form an alkane from an alkene were slower than alkene inter-conversion. A kinetic model for alkene inter-conversion was deduced. Experimental and simulation results indicated that a lower partial pressure of the reactant gave increased propene yield when ethene was the feed.

Graphical abstractA SAPO-34 molecular sieve catalyst can increase propene yield from light alkenes, including ethene, propene and linear butenes, by imposing shape selectivity on their inter-conversion. The different carbenium ion intermediates can be treated as a carbenium ion lump (Cx+) in a kinetic scheme where the light alkenes are first converted to Cx+ and then Cx+ is cracked to light alkenes, methane and C5+ in parallel reactions. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Light olefins; SAPO; Propene production; Kinetic model
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Kinetics of the reactions of the light alkenes over SAPO-34
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 348, Issue 1, 30 September 2008, Pages 135–141
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us