Effect of Surface Modification of Оі-Al2O3 Using Oxalate Complexes of Aluminium on the Formation and Properties of Platinum Centres of Pt/Al2O3 Catalysts
R. M. MIRONENKO1, O. B. BELSKAYA1,2, O. V. MAEVSKAYA1, T. I. GULYAEVA1, M. O. KAZAKOV1, A. V. LAVRENOV1 and V. A. LIKHOLOBOV1,2
1 Institute of Hydrocarbons Processing, Siberian Branch of the Russian Academy of Sciences,
Ul. Neftezаvodskаya 54, Omsk 644040, Russia
ch-mrm@mail.ru
2 Omsk State Technical University,
Pr. Mira 11, Omsk 644050, Russia
Keywords: Оі–aluminium oxide, surface modification, chloride complexes of platinum, aluminium-platinum catalysts, adsorption mechanism
Pages: 241–249
Abstract
Modification of the oxide surface of aluminium oxide with oxalate complexes of aluminium was carried out, followed by thermal treatment for the purpose of varying the ratio between the functional groups on the surface (ОН groups, Lewis acid centres). It was established that the modification of γ–Al2O3 causes a 1.5-fold increase in the amount of adsorbed platinum (IV) complexes and the fraction of these complexes strongly bound with the surface of the support. The effect of γ–Al2O3 surface modification on the catalytic properties of the system Pt/Al2O3 was demosntrated. It was shown that an increase in the fraction of platinum forms strongly bound with the support causes an increase in the content of methylcyclopentane in the products of n–hexane isomerization and an increase in the selectivity of the formation of propylene in propane transformations.
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