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The Ru/Al_2O_3 catalysts modified with metal oxide(K_2O and La_2O_3)were prepared via incipient wetness impregnation method from RuCl_3·nH_2O mixed with nitrate loading on Al_2O3 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-K_2O/Al_2O3 and Ru-La_2O_3/Al_2O_3 were lowered approximately 30℃compared with pure Ru/Al_2O_3,and the activity temperature range was widened.The conversion of CO on Ru-K_2O/Al_2O_3 and Ru-La_2O_3/Al_2O_3 was above 99% at 140-160℃,suitable to remove CO in a hydrogen-rich gas and the selectivity of Ru-La_2O_3/Al_2O_3 was higher than that of Ru-K_2O/Al_2O_3 in the active temperature range. Slight methanation reaction was detected at 220℃and above.
The activity of catalysts was evaluated on simulative conditions for the preferential oxidation of CO (CO) (CO 2) 2 (SO 2) 2 -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-K20 / Al203 and Ru-La203 / Al203 were and the activity temperature range was widened. The conversion of CO on Ru-K20 / Al203 and Ru-La203 / Al203 was above 99% at 140-160 ° C, suitable to remove CO in a hydrogen-rich gas and the selectivity of Ru-La 2 O 3 / Al 2 O 3 was higher than that of Ru-K 2 O / Al 2 O 3 in the active temperature range. Slight methanation was detected at 220 ° C. and above.