Enhanced catalytic performance of Au/CuO-ZnO catalysts containing low CuO content for preferential oxidation of carbon monoxide in hydrogen-rich streams for PEMFC

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• 作者：Amir Alihoseinzadeh ; Abbas Ali Khodadadi ; Yadollah Mortazavi
• 关键词：PEM ; Fuel cell ; Preferential oxidation ; Au nanoparticles ; CuO ; ZnO
• 刊名：International Journal of Hydrogen Energy
• 出版年：4 February, 2014
• 年：2014
• 卷：39
• 期：5
• 页码：2056-2066
• 全文大小：2747 K

文摘

In this study, effects of Au and CuO loadings in Au/CuO-ZnO nanocatalysts for preferential oxidation of carbon monoxide in H₂-rich streams (PROX) are investigated. CuO-ZnO supports were synthesized by a co-precipitation method. Au was also incorporated into the catalysts by a deposition-precipitation procedure. The catalysts were characterized by XRD, BET surface area, FESEM, HRTEM, H₂-TPR, FTIR, and CO-TPD. 2-10聽nm Au nanoparticles are dispersed on CuO-ZnO support and significantly enhance the reducibility of CuO. The Au/CuO-ZnO catalysts containing low amount of CuO were found to be more active for PROX compared to the Au/ZnO catalyst. Moreover, as more CuO is added to Au/ZnO, the CO₂ selectivity increases in the whole PROX temperature range. The catalyst containing 2聽wt% Au and 1聽wt% CuO on ZnO exhibited the highest activity and selectivity in the operating temperature range of PEM fuel cells. The activity of this catalyst also remained almost intact during 900聽min of PROX time on stream at 80聽掳C.