INFLUENCE OF PREPARATION PROCEDURE, NATURE OF THE ACTIVE COMPONENT, AND SUPPORT ON THE PROPERTIES OF M-CE-ZR-O (M=CR, BE, CO) CATALYSTS FORCOMPLETE OXIDATION OF HYDROCARBONS

The influence of the preparation procedure, the nature of an active co mponent and a support on physicochemical and catalytic properties of t he M-Ce-Zr-O and M-Ce-Zr-O/support systems, where M is Cr, Fe, Co whil e a support is gamma- or alpha-Al2O3, is studied. The bulk samples cal cined at 850 degrees C are shown to consist of a mixture of both cubic CeO2 and ZrO2 phases and M(n)O(m) (Cr2O3, alpha-F2O3, and Co3O4). A s pecific catalytic activity of M-Ce-Zr-O samples in the reaction of the butane complete oxidation is equal to 1.2 x 10(-7) mol C4H10 M(-2)s(- 1). The phase composition of the M-Ce-Zr-O/Al2O3 samples depends on th e M nature. Thus, the phase composition of chromium- and iron-containi ng samples is similar to that of bulk samples (a support phase is addi tionally present). In the cobalt-containing samples, CoAl2O4 is formed . The Cr-Ce-Zr-O/gamma-Al2O3 samples exhibit the maximum activity in t he reaction under study. Their activity and thermal stability depend o n the order of the introduction of an active component onto a support.