Steam effects over Pd/Ce_0.67Zr_0.33O₂-Al₂O₃ three-way catalyst

详细信息    查看全文

• 作者：Jianqiang WANG ; Meiqing SHEN ; Jun WANG ; Jidong GAO ; Jie MA ; Shuangxi LIU
• 关键词：Pd/Ce0.67Zr0.33O2-Al2O3 ; three-way catalytic activity ; water-gas shift ; steam reforming ; stoichiometric window ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2012
• 出版时间：August, 2012
• 年：2012
• 卷：30
• 期：8
• 页码：748-752
• 全文大小：602 K

文摘

Ceria-zirconia-alumina (CZA) solid solution was prepared by sol-gel method in the present study. 0.5 wt. % Pd supported on CZA was prepared by incipient wetness impregnation. The steam effects for CO and C₃H₈ oxidation, three-way catalytic activity and stoichiometric window property were studied. The light-off temperature of the CO oxidation reaction shifted to a lower temperature due to the water-gas shift (WGS) reactions. The oxidation of C₃H₈ was enhanced due to the steam reforming (SR) reactions. The steam promoted the C₃H₈ oxidation and NO reduction in three-way catalytic reaction. The amplitude of stoichiometric window was amplified by the addition of water to the feed stream.