Pretreatment Effect on CO Oxidation over Highly Ordered Mesoporous Silver Catalyst

Abstract

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 H2 or O2 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 H2 exhibited an excellent catalytic activity compared to the as-prepared and O2-pretreated catalysts. Moreover, this present mesoporous silver material showed good catalytic stability. For the CO oxidation, the apparent activation energy of the H2-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 O2-pretreated (124 ± 1.4 kJ mol -1 ) catalysts.

Room-temperature CO oxidation over a highly ordered mesoporous RuO2 catalyst

“…The mesoporous silica template (KIT-6) was synthesized following previously reported methods [26,[36][37][38][39][40]. A triblock copolymer (Pluronic P123, EO 20 PO 70 EO 20 , Aldrich) and tetraethylorthosilicate (TEOS, Aldrich) were utilized as the structure-directing agent and framework source, respectively.…”

The Effect of Hydrothermal Treatment on Silver Nanoparticles Stabilized by Chitosan and Its Possible Application to Produce Mesoporous Silver Powder

“…Electronic industry consumes large amounts of silver powder that is usually used as conductive paste [13][14][15][16]. Several studies have indicated that mesoporous silver powders with higher porosity and larger surface area engender higher application efficiencies such as reducing firing temperature of conductive film [17], enhancing the resistance of heat exchanger material at ultralow temperature [18], or increasing catalytic activity of an oxidation reaction [19,20]. Recently, due to the rapid development of electronic industry, it demands a huge amount of high quality silver powder.…”