Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10244670 | Journal of Catalysis | 2005 | 16 Pages |
Abstract
The co-reaction of propene or n-butene and methanol over an H-ZSM-5 acidic zeolite catalyst has been investigated using isotopically labeled reagents. The main objective has been to obtain kinetic data for the methylation of the propene and n-butene. This study is an extension of our previous investigation of the co-reaction of ethene and methanol [S. Svelle, P.O. Rønning, S. Kolboe, J. Catal. 224 (2004) 115]. At the very high feed rates employed here, the methylation products are dominating, and the isotopic composition is in accord with a methylation formation mechanism. Arrhenius plots have been constructed, and the activation energies, when corrected for the appropriate heats of alkene adsorption, were â¼110 kJ/mol for the methylation of propene and â¼90 kJ/mol for the methylation of n-butene. The results are compared with recent computational studies of the methylation of alkenes. The origin of the products not formed via methylation is briefly discussed. A short survey of the reactivity of propene and n-butene without methanol co-feed is presented. It has been found that alkene interconversion reactions are strongly suppressed by the presence of methanol.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Catalysis
Authors
Stian Svelle, Per Ola Rønning, Unni Olsbye, Stein Kolboe,