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Pattarasuda Naknam Apanee Luengnaruemitchai Sujitra Wongkasemjit 《International Journal of Hydrogen Energy》2009
Preferential CO oxidation in a H2-rich stream was studied over Au/ZnO and Au/ZnO–Fe2O3 catalysts prepared by photodeposition under UV–vis light. The high catalytic activities of both Au/ZnO and Au/ZnO–Fe2O3 catalysts are presented over a temperature range of 30–130 °C. TEM results revealed that the average particle size of Au over the Au/ZnO and Au/ZnO–Fe2O3 catalysts, is in the range of 3–5 nm. Moreover, DR/UV–vis spectra showed that the prepared catalysts contained Auδ+ and Au0 (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 CO2 and H2O were added to the simulated stream. 相似文献
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Pattarasuda Naknam Apanee Luengnaruemitchai Sujitra Wongkasemjit Somchai Osuwan 《Journal of power sources》2007
A series of AuPt/A zeolite and Pt/A zeolite catalysts prepared by incipient wetness impregnation are investigated for the preferential oxidation (PROX) of carbon monoxide in the presence of hydrogen over the temperature range of 50–310 °C under atmospheric pressure. The results indicate that when a small amount of gold is added to the Pt/A zeolite catalyst, the CO selectivity is improved at low temperatures, and 1% AuPt/A zeolite (at a weight ratio of Au:Pt = 1:2) gives the best performance, which provides a high CO conversion in combination with a high CO selectivity. In more realistic simulated reformate gases containing 10% CO2 and 10% H2O, there is not much difference between those in the presence and the absence of CO2 and H2O. Transmission electron microscopic and X-ray diffraction studies show that the two metals, Au and Pt, appear to be severely phase separated, which is confirmed by energy dispersive investigations. 相似文献
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