Mesoporous Ce_xZr_(1-x)O2 solid solutions supported CuO nanocatalysts for toluene total oxidation

摘要

Mesoporous Ce_xZr_(1-x)O2 solid solutions were prepared by the surfactant-assisted method and used as support of CuO nanocatalysts for catalytic total oxidation of toluene. The prepared CuO/Ce_xZr_(1-x)O2 catalysts have a wormhole-like mesoporous structure with high surface area and uniform pore size distribution, and the CuO nanoparticles were highly dispersed on the surface of Ce_xZr_(1-x)O2. The doping of ZrO2 in CeO2 promotes the dispersion of active copper species and enhances the reducibility of copper species. The effect of Ce/Zr ratio, calcination temperature and CuO loading amount on the catalytic performance of CuO/Ce_xZr_(1-x)O2 was investigated in detail. The 400 °C-calcined 8%CuO/Ce_(0.8)Zr_(0.2)O2 catalyst exhibits the highest activity with the complete toluene conversion temperature of 275 °C at the condition of GHSH = 33,000 h~(-1) and the toluene concentration of 4400 ppm. The interfacial interaction between CuO and the Ce_xZr_(1-x)O2 support, highly dispersed CuO nanoparticles and the nature of the support contribute to the high catalytic activity of mesoporous CuO/Ce_xZr_(1-x)O2 nanocatalysts.