Preferential CO oxidation over Au/ZnO and Au/ZnO-Fe_2O_3 catalysts prepared by photodeposition

摘要

Preferential CO oxidation in a H_2-rich stream was studied over Au/ZnO and Au/ZnO-Fe_2O_3 catalysts prepared by photodeposition under UV-vis light. The high catalytic activities of both Au/ZnO and Au/ZnO-Fe_2O_3 catalysts are presented over a temperature range of 30-130 ℃. TEM results revealed that the average particle size of Au over the Au/ZnO and Au/ZnO-Fe_2O_3 catalysts, is in the range of 3-5 nm. Moreover, DR/UV-vis spectra showed that the prepared catalysts contained Au~(δ+) and Au~0 (active sites for the PROX reaction) on the catalyst support. Based on the experiment observations, it can be concluded that the catalysts prepared by a photodeposition exhibited excellent catalytic activity, even when both CO_2 and H_2O were added to the simulated stream.