NDLI: Search for confinement effects in mesoporous supports: hydrogenation of o-xylene on Pt°/MCM-41

Content Provider	Springer Nature Link
Author	Letellier, Franck Blanchard, Juliette Fajerwerg, Katia Louis, Catherine Breysse, Michèle Guillaume, Denis Uzio, Denis
Copyright Year	2006
Abstract	The occurrence in mesoporous supports of a confinement effect related to the adsorption strength of a reaction intermediate on a metallic phase dispersed in the mesopores is examined, as well as its effect on the activity and selectivity. A model is proposed in order to determine the catalyst requirements (size of the pores and of the metal particles), which would allow to maximise the confinement. Alkyltrimethylammonium surfactants with increasing alkyl chain length were used to prepare MCM-41 supports, with controlled pore size between 22 and 39 Å and Pt° particles of controlled size (from 11 to 18 Å) were formed in the porosity of the MCM-41 supports. The reaction of hydrogenation of o-xylene was chosen as model reaction, because (i) previous studies have highlighted the influence of the adsorption strength of 1,2-dimethylcyclohexene (DMCHE, reaction intermediate formed by cis-addition of four hydrogen atoms on o-xylene) on the metallic surface on the selectivity toward trans-dimethylcyclohexane (trans-DMCH) and (ii) the kinetic diameter of DMCHE (6.4 Å) is close to the distance between the metallic particle surface and the silica wall of the series of Pt°/MCM-41 catalysts. Slight decrease in the turn-over frequency (TOF) and increase in the selectivity toward trans-DMCH are observed for the smaller pore sizes, and the assignment of this effect to a confinement of the reaction intermediate is discussed.
Starting Page	115
Ending Page	124
Page Count	10
File Format	PDF
ISSN	1011372X
Journal	Catalysis Letters
Volume Number	110
Issue Number	1-2
e-ISSN	1572879X
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2006-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	confinement mesoporous MCM-41 o-xylene hydrogenation pore size Physical Chemistry Industrial Chemistry/Chemical Engineering Catalysis Pharmacy
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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