An ab initio investigation of hydrocarbon radical β-scission reaction kinetics

Xiaobo Zheng, Paul Blowers

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Hydrocarbon thermal cracking reactions are the key steps in petroleum refinery processes, and the mechanism is generally accepted to involve free-radical reactions. The MP2 ab initio method was applied to study β-scission reactions of propyl, butyl, and neopentyl radicals. The CBS-RAD(MP2) method was created as a modification of the CBS-RAD method. The method had the least root mean square error for heats of reaction and activation energy calculations for 15 hydrocarbon cracking reactions with less computational cost compared with the G2 and G3 methods. Work applying Transition State Theory and RRKM theory was done to estimate the reaction rate constants for hydrocarbon cracking reactions. The CBS-RAD(MP2) method had excellent agreement with the experimental data, indicating its reliability as a method for studying other large hydrocarbon cracking reactions. A reaction kinetic model with pressure and temperature effects was also proposed, which could be easily applied to different reaction conditions without performing additional expensive and complicated calculations. This is an abstract of a paper presented at the AIChE Annual Meeting and Fall Showcase (Cincinnati, OH 10/30/2005-11/4/2005).

Original languageEnglish (US)
Title of host publication05AIChE
Subtitle of host publication2005 AIChE Annual Meeting and Fall Showcase, Conference Proceedings
PublisherAmerican Institute of Chemical Engineers
ISBN (Print)0816909962, 9780816909964
StatePublished - 2005
Event05AIChE: 2005 AIChE Annual Meeting and Fall Showcase - Cincinnati, OH, United States
Duration: Oct 30 2005Nov 4 2005

Publication series

NameAIChE Annual Meeting Conference Proceedings


Other05AIChE: 2005 AIChE Annual Meeting and Fall Showcase
Country/TerritoryUnited States
CityCincinnati, OH

ASJC Scopus subject areas

  • General Energy


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