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1 Polish Journal of Chemistry

1 2008

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Influence of Au/Fe2O3 and Au/TiO2 Catalysts Preparation on Their Activity in CO Oxidation by Oxygen and Water Gas Shift Reactions

Jóźwiak W. K., Kaczmarek E., Ignaczak W.

Polish Journal of Chemistry

2008

Vol. 82, nr 1-2

213-222

Supported Au/Fe2O3 and Au/TiO2 catalysts appear very active in both carbon monoxide oxidation by oxygen or water. The aim of this work was to find correlation between gold catalysts activity andmethods of their preparation (impregnation and deposition-precipitation), the influence of alkali ions additives and temperature of calcination. The physico-chemical properties of Au/Fe2O3 and Au/TiO2 catalysts were investigated by TPR, ToF-SIMS and catalytic activity methods. Carbon monoxide conversion degree in oxidation by oxygen is higher for Au/Fe2O3 than for Au/TiO2 catalyst, but the activity of gold catalysts in carbon monoxide oxidation by water is opposite. The most active catalyst was Au/Fe2O3 prepared by deposition-precipitation method with an addition of urea and those catalysts prepared by impregnation method with an addition of KOH. The analogically prepared Au/TiO2 catalyst exhibited comparable activity. The gold catalysts appear the most active after drying at 60 graduate C – the role of disordered catalyst structure and hydroxyl groups. The carbon monoxide conversion degree depends on the applied precipitate agent in the following order: KOH > Na2CO3 > NH3. The gold catalysts do not lose catalytic activity during long lasting tests (170 h) and do not suffer on the presence of moisture and chlorine in catalyst system. The impregnated Au(K)/Fe2O3 catalysts with a ratio Cl/Au = 4/1 – 8/1 show considerable activity.