Effect of MgO content in the support of Au/MgF2-MgO catalysts on CO oxidation

Authors:

• Iwona Tomska-Foralewska,
• Wieslaw Przystajko,
• Mariusz Pietrowski,
• Michał Arkadiusz Zieliński,
• Maria Wojciechowska

Abstract

Novel magnesium oxo-fluoride supports containing different amounts of MgO, prepared by the sol-gel method have been proposed for the synthesis of gold catalysts. The MgF₂-MgO supports have mesoporous structure and their surface area is a few times larger than those of pure MgF₂ or pure MgO. Gold catalysts have been prepared by impregnation of the MgF ₂-MgO supports with HAuCl₄ in the amount corresponding to 1 wt.% Au. The gold catalysts has been characterized by XRD, TEM measurements and the catalytic activity in CO oxidation at temperatures 30-300 °C have been performed. The Au/MgF₂-MgO catalysts show higher activities (depending on the content of MgO in the support) as compared to Au/MgF ₂ and Au/MgO prepared under the same conditions. Their activities fall into the upper range of gold catalysts supported on other carrier reported in literature. © Akadémiai Kiadó, Budapest, Hungary 2010.