Kinetics and mechanism of olefin methylation reactions on zeolites

Ian M. Hill, Saleh Al Hashimi, Aditya Bhan

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

Abstract

The effect of zeolite topology on steady-state dimethyl ether (DME) methylation of ethylene and propylene has been studied for zeolites H-FER, H-MOR, H-MFI, and H-BEA. Reactant pressure dependence studies over these materials at low conversions (<0.5%) and high DME:olefin ratios (30:1) show a first-order rate dependence on olefin pressure and a zero order rate dependence on DME pressure in accordance with a zeolite surface predominantly consisting of activated DME-derived species reacting with olefins. Temperature dependence studies in low temperature regimes (<430K) yield elementary-step activation energies and rate constants. Systematically lower activation barriers and higher rate constants were observed for propylene methylation in comparison with ethylene methlyation on all frameworks studied. Kinetic and isotopic studies probing the involvement of surface methyl groups in olefin methylation cycles and the relative rates of propagation of olefin methylation cycles in methanol to hydrocarbons catalysis on different zeolites will be presented.

Original languageEnglish (US)
Title of host publication11AIChE - 2011 AIChE Annual Meeting, Conference Proceedings
StatePublished - Dec 1 2011
Event2011 AIChE Annual Meeting, 11AIChE - Minneapolis, MN, United States
Duration: Oct 16 2011Oct 21 2011

Publication series

Name11AIChE - 2011 AIChE Annual Meeting, Conference Proceedings

Other

Other2011 AIChE Annual Meeting, 11AIChE
CountryUnited States
CityMinneapolis, MN
Period10/16/1110/21/11

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