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

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 MgF 2 -MgO supports have mesoporous structure and their surface area is a few times larger than those of pure MgF 2 or pure MgO. Gold catalysts have been prepared by impregnation of the MgF 2 -MgO supports with HAuCl 4 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/MgF 2 -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.

Analysis of reaction mechanisms and kinetics of preferential CO oxidation over Au/γ-Al2O3

“…Preferential oxidation of CO (PROX) has been suggested as an effective method of hydrogen clean-up for fuel cell applications, and gold has received wide interest as a potential PROX catalyst due to its high activity and selectivity at temperatures near the operating temperature of proton exchange membrane (PEM) fuel cells [1][2][3][4][5]. Despite the extensive research carried out in the field, controversies still remain related to the reaction mechanism and the knowledge regarding the kinetics of the reaction can still be considered as being limited and incomplete.…”