Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases p. 835 - 844 (1983)
Update date:2022-08-16
Topics:
Garbowski, Edouard
Candy, Jean-Pierre
Primet, Michel
U.v.-visible reflectance spectroscopy and mass spectrometry have been used to study the interaction of n-butane with chlorinated alumina with and without platinum.On the pure alumina no reaction is detected except at high temperatures, where coking of the catalysts takes place.Chlorinated alumina reveals strong acidic sites; on this catalyst isomerization occurs but coking is not inhibited.Platinum deposited on the alumina exhibits hydrogenolysis properties at high reaction temperatures.In the chlorination of Pt/Al2O3 by CCl4, oxidation of the metal occurs in the first stage accompanied by the appearance of strong Lewis-acid sites on the support.Then a complex between PtCl2 and AlCl3 is formed and is dispersed on the alumina.The system obtained is active in the isomerization of n-butane.At 300 deg C under a mixture of n-butane and H2 the complex is reduced, with chlorine leaving the surface.Once the chlorine is removed coking cannot be prevented.
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