Selective oxidation of CO in excess H2 over Ru/Al2O3 catalysts modified with metal oxide

被引：26
作者：
Chen, Xirong [1 ]
Zou, Hanbo [2 ]
Chen, Shengzhou [2 ]
Dong, Xinfa [1 ]
Lin, Weiming [1 ,2 ]
机构：
[1] S China Univ Technol, Sch Chem & Energy Engn, Guangzhou 510641, Guangdong, Peoples R China
[2] Guangzhou Univ, Sch Chem & Chem Engn, Guangzhou 510006, Guangdong, Peoples R China
来源：
JOURNAL OF NATURAL GAS CHEMISTRY | 2007年 / 16卷 / 04期
基金：
中国国家自然科学基金;
关键词：
hydrogen-rich gas; ruthenium based catalysts; CO removal; selective oxidation; metal oxide;
D O I：
10.1016/S1003-9953(08)60013-4
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
The Ru/Al2O3 catalysts modified with metal oxide (K2O and La2O3) were prepared via incipient wetness impregnation method from RuCl3 center dot nH(2)O mixed with nitrate loading on Al2O3 support. The activity of catalysts was evaluated under simulative conditions for the preferential oxidation of CO (CO-PROX) from the hydrogen-rich gas streams produced by reforming gas, and the performances of catalysts were investigated by XRD and TPR. The results showed that the activity temperature of the modified catalysts Ru-K2O/Al2O3 and Ru-La2O3/Al2O3 were lowered approximately 30 degrees C compared with pure Ru/Al2O3, and the activity temperature range was widened. The conversion of CO on Ru-K2O/Al2O3 and Ru-La2O3/Al2O3 was above 99% at 140-160 degrees C, suitable to remove CO in a hydrogen-rich gas and the selectivity of Ru-La2O3/Al2O3 was higher than that of Ru-K2O/Al2O3 in the active temperature range. Slight methanation reaction was detected at 220 degrees C and above.
引用
收藏
页码：409 / 414
页数：6
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