Pretreatment Effect on CO Oxidation over Highly Ordered Mesoporous Silver Catalyst

Highly ordered mesoporous silver material was Successfully synthesized from a mesoporous silica template (KIT-6) with 3-D channel structure using the nano-replication method. The effects of H-2 or O-2 pretreatments on the catalytic performance of the mesoporous silver were investigated using a temperature programmed CO oxidation technique in a fixed bed reactor. The mesoporous silver material that was pretreated with H-2 exhibited ail excellent catalytic activity compared to the as-prepared and O-2-pretreated catalysts. Moreover, this present mesoporous silver material showed good catalytic stability. For the CO oxidation, the apparent activation energy of the H-2-pretreated mesoporous silver catalyst was 61 +/- 0.5 kJ mol(-1), which was also much lower than the as-prepared (132 +/- 1.5 kJ mol(-1)) and O-2-pretreated (124 +/- 1.4 kJ mol(-1)) catalysts.