Effects of composition and method of preparation of lead-containing oxide systems on their catalytic properties in the oxidative dimerization of methane

I. A. Kurzina, S. I. Galanov, L. N. Kurina

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    The effects of the Pb-Sn-O composition, the method of precipitating the active components, and modification with alkaline earth metals on the physico-chemical and catalytic properties of lead-tin catalysts in oxidative dimerization of methane have been studied. The effect of the phases of lead orthostannate, Pb2SnO4, on the surface properties of the Pb-Sn-O system has been established. The most selective composition has a ratio PbO : SnO2 - 80 : 20 mole % on α-Al2O3 with divalent metal hydroxides. Introduction of alkaline earth metals into the Pb-Sn-O/α-Al2O3 system leads to stabilization of lead in its 4-valent state with formation of metal orthoplumbates, M2PbO4, and to a decrease in selectivity with respect to C2-hydrocarbons. The increased catalytic activity of the modified M-Pb-Sn-O/α-Al2O3 samples (M = Ba, Sr, Ca, and Mg) is determined by the presence of tightly bound oxygen. Conclusions about the nature of the interaction of the reagents with the surface of the catalyst were reached.

    Original languageEnglish
    Pages (from-to)304-310
    Number of pages7
    JournalTheoretical and Experimental Chemistry
    Issue number5
    Publication statusPublished - 1 Jan 2001


    ASJC Scopus subject areas

    • Chemistry(all)

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