Cu-Zr-Ce-O催化剂上CO选择性氧化及再生研究

The Cu-Zr-Ce-O mixed oxide catalysts for the selective CO oxidation with various ZrO2 contents were prepared by co-precipitation method and characterized by DSC/TG, XRD and TEM techniques. The effects of ZrO2 loading and different regeneration methods on the activity of Cu-Zr-Ce-O catalysts were investigated. The results showed that higher CO conversion (>99%) and selectivity in a wide temperature range（160 ℃～200 ℃） are obtained when appropriate quantity of ZrO2 is added to Cu1Ce9Oδ. The optimum composition of the catalyst is Cu1Zr1Ce9Oδ. The addition of ZrO2 can improve the thermal stability of the catalyst, decrease the pore size and change the particles' sintering manner simultaneously. The deactivated Cu1Zr1Ce9Oδ catalyst can be refreshed to certain extent by treating at 300 ℃ in nitrogen or 20％H2/N2 atmosphere, while it can be well regenerated in 20％O2/N2 at the same temperature, probably because that the treatment of 20％O2/N2 can enhance the surface absorbed oxygen and well restore the activity of the deactivated catalyst.