Copper catalysts prepared via microwave-heated polyol process for preferential oxidation of CO in H₂-rich streams

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• 作者：Kui-Hao Chuang^a ; Kaimin Shih^b ; Chi-Yuan Lu^c ; Ming-Yen Wey^a ; ^{mywey@dragon.nchu.edu.tw}
• 关键词：Preferential carbon monoxide oxidation ; Microwave-heated polyol process ; Ceria ; Thermal decomposition ; Copper
• 刊名：International Journal of Hydrogen Energy
• 出版年：2013
• 出版时间：11 January, 2013
• 年：2013
• 卷：38
• 期：1
• 页码：100-108
• 全文大小：958 K

文摘

The purposes of this study were to prepare a copper catalyst by the microwave-heated polyol (MP) process and subsequently to evaluate the feasibility of the preferential oxidation of CO (CO-PROX) in excess H₂. A CeO₂-TD support was firstly prepared by the thermal decomposition from Ce(NO₃)₃¡¤6H₂O precursor. For comparison, commercial ceria (CeO₂-C) and activated carbon (AC) selected as support materials. Experimental results of CO-PROX indicated that the highest catalytic activity is achieved when the Cu/CeO₂-TD used as catalysts. Correlating to the characteristic results, it is found that the CeO₂-TD support prepared by the thermal decomposition has a large surface area and high mesoporosity; these properties contribute to the easy adsorption of pollutants and the effective dispersion of metal particles. Further investigation of feed composition found that Cu/CeO₂-TD catalysts possess 100 % CO conversion even existence of CO₂ and H₂O in H₂-rich streams at 150?¡ãC. Besides, a decrease in CO conversion was clearly observed above 175?¡ãC for Cu/CeO₂-TD catalysts due to the reverse water gas shift reaction tending to reform CO from CO₂ and H₂.