NDLI: Hydrogen–deuterium isotope effects in the reactions of chlorobenzene and benzene on a Pt/γ-Al2O3 catalyst

Content Provider	Springer Nature Link
Author	van den Brink, R.W. de Jong, V. Louw, R. Maggi, P. Mulder, P.
Copyright Year	2001
Abstract	The kinetic isotope effect for combustion of a C6H5Cl/C6D5Cl mixture on Pt/γ-Al2O3 was found to be close to unity between 520 and 580 K. However, in the presence of an excess of heptane, an isotope effect of 1.5 was found between 460 and 490 K. For the combustion of a C6H6/C6D6 mixture the kH/kD value was around 2 between 404 and 439 K. The results show that in the combustion of chlorobenzene per se, C–H bond activation is not a rate-determining step. On Pt sites, C–Cl bond scission probably occurs already at low temperatures. The chlorine and the phenyl group cannot easily react further. Chlorine on the surface is active in chlorination, which is shown by the formation of C6D5Cl in an experiment with C6H5Cl and C6D6. Only at a certain temperature is the chlorine removed, partly as polychlorinated benzenes. The removal of chlorine from the catalyst allows oxygen to take part in the reaction, which determines the rate of the combustion of chlorobenzene. When heptane is present, Cl is removed from the surface and C–H bond scission can become rate determining, as is also the case in the combustion of C6H6/C6D6. Upon (partial) combustion of C6H5Cl/C6D5Cl and C6H6/C6D6 mixtures on a Pt/γ-Al2O3 catalyst, hydrogen–deuterium exchange occurs on the γ-Al2O3 support.
Starting Page	15
Ending Page	20
Page Count	6
File Format	PDF
ISSN	1011372X
Journal	Catalysis Letters
Volume Number	71
Issue Number	1-2
e-ISSN	1572879X
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2001-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physical Chemistry Industrial Chemistry/Chemical Engineering Pharmacy
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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