Abstract: РР-3 Исследование in situ Sn-Pt/SiO2 катализаторов низкотемпературного окисления СО Low temperature oxidation of СО over alloy type Sn-Pt/SiO2 catalysts with different Sn/Pt ratios has been investigated at different СО partial pressure using Тhermal Programmed Oxidation technique and time on stream experiments. The activity of the catalyst had а maximum, which depended on both the Sn/Pt ratio and the СО partial pressure. FTIR and Mossbauer spectroscopy has been used to follow compositional and structural changes of Sn-Pt/SiO2 catalysts during the catalytic run. The results show that the in situ formed, highly mobile "Snn+-Pt еnsеmblе" sites are responsible for high activity, while formation of relatively stable SnOx type surface species are involved in the catalyst deactivation.

Cite: Borbáth I. , Margitfalvi J. , Lázár K. , Szegedi A. , Hegedus M. , Gobolos S.
In situ characterization of Sn-Pt/SiO2 catalysts used in low temperature oxidation of СО
VI Russian Conference on Catalytic Reaction Mechanisms 01-05 Oct 2002