Au/3DOM Co3O4: highly active nanocatalysts for the oxidation of carbon monoxide and toluene

摘要

Three-dimensionally ordered macroporous Co3O4 (3DOM Co3O4) and its supported gold (xAu/3DOM C03O4, x = 1.1-8.4 wt%) nanocatalysts were prepared using the polymethyl methacrylate-templating and bubble-assisted polyvinyl alcohol-protected reduction methods, respectively. The 3DOM Co3O4 and xAu/3DOM Co3O4 samples exhibited a surface area of 22-27 m~2 g~(-1). The Au nanoparticles with a size of 2.4-3.7 nm were uniformly deposited on the macropore walls of 3DOM Co3O4. There were good correlations of oxygen adspecies concentration and low-temperature reducibility with catalytic activity of the sample for CO and toluene oxidation. Among 3DOM Co3O4 and xAu/3DOM Co3O4, the 6.5Au/ 3DOM Co3O4 sample performed the best, giving a T_(90%) (the temperature required for achieving a conversion of 90%) of-35 °C at a space velocity of 20 000 mL g~(-1) h~(-1) for CO oxidation and 256 °C at a space velocity of 40 000 mL g~(-1) h~(-1) for toluene oxidation. The effect of water vapor was more significant in toluene oxidation than in CO oxidation. The apparent activation energies (26 and 74 kJ mol~(-1)) over 6.5Au/3DOM Co3O4 were lower than those (34 and 113 kJ mol~(-1)) over 3DOM Co3O4 for CO and toluene oxidation, respectively. It is concluded that the higher oxygen adspecies concentration, better low-temperature reducibility, and strong interaction between Au and 3DOM Co3O4 were responsible for the excellent catalytic performance of 6.5AU/3DOM Co3O4.