Title: Quantitative sorption experiments on Ti-zeolites and relation with alpha-olefin oxidation by H2O2
Authors: Langhendries, G ×
De Vos, Dirk
Baron, GV
Jacobs, Pierre #
Issue Date: 1999
Series Title: Journal of catalysis vol:187 issue:2 pages:453-463
Conference: date:Free Univ Brussels, Dept Chem Engn, B-1050 Brussels, Belgium; Katholieke Univ Leuven, Ctr Catalysis & Surface Sci, B-3001 Heverlee, Belgium
Abstract: A tracer chromatographic method is used to study liquid-phase adsorption on TS-1, Ti-beta, and Ti-MCM-41. Partition coefficients for alkenes, alkanes, epoxides, and other polar products are strongly dependent on the carrier solvent. Linear alpha-olefins are concentrated inside the TS-1 micropores, particularly when methanol is the solvent, This agrees well with the superior initial rates of olefin epoxidation with TS-1 in methanol. Sorption also governs the relative reactivities of olefin substrates, especially in competitive experiments. Thus, under truly initial conditions, 1-hexene is less reactive than 1-octene or 1-nonene, For the latter substrates, however, deactivation is fast, especially in methanol. This process is related to the strong adsorption of higher 1,2-epoxyalkanes in TS-1 in methanol. Deactivation due to competitive epoxide adsorption is slower in acetone, making this a more suitable solvent than methanol for 1-nonene epoxidation with TS-1. Overall, physisorption effects play a dominant role in the small pore TS-1 catalyst, due to the close interaction of substrates such as alkenes with the pore wall. Wider-pore catalysts such as Ti-beta and especially Ti-MCM-41 do not adsorb olefins as selectively and hence intraporous olefin concentrations are much lower. (C) 1999 Academic Press.
ISSN: 0021-9517
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Centre for Surface Chemistry and Catalysis
× corresponding author
# (joint) last author

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