Preferential catalytic oxidation of carbon monoxide in presence of hydrogen over bimetallic AuPt supported on zeolite catalysts

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• 作者：Pattarasuda Naknam ; Apanee Luengnaruemitchai ; Sujitra Wongkasemjit ; Somchai Osuwan
• 关键词：Preferential carbon monoxide oxidation ; Bimetallics ; Au-Pt catalyst ; A-type zeolite ; Fuel cell ; Selectivity
• 刊名：Journal of Power Sources
• 出版年：2007
• 期刊代码：58_03787753
• 类别：ce
• 出版时间：25 February 2007
• 卷：165
• 期：1
• 页码：353-358
• 文件大小：733 K

摘要

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.