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采用分步浸渍法制备了一系列Ru1-Lax-Oy/γ-Al2O3复合氧化物催化剂,在固定床微反装置中进行CO选择性氧化催化性能研究。考察了催化剂上不同La2O3添加量、不同再生方法对催化剂CO选择性氧化反应性能的影响,并通过TPR、XRD等手段对催化剂进行了表征。结果表明,添加w(La)=10%的Ru1-La10-Oy/γ-Al2O3催化剂在110℃～170℃温度区间具有99%以上的CO转化率,并且催化剂的选择性相对较高。经氮气、氢气及氧气再生处理后的Ru1-La10-Oy/Al2O3催化剂,其催化活性有所不同,其中经氧气处理后的催化剂,表面吸附氧含量较高,活性恢复较好。
A series of Ru1-Lax-Oy / γ-Al2O3 composite oxide catalysts were prepared by a step-by-step impregnation method. The performance of CO selective oxidation was investigated in a fixed bed micro-reactor. The effect of different amount of La2O3 and different regeneration methods on the selective oxidation of CO was investigated. The catalysts were characterized by TPR and XRD. The results show that the addition of Ru1-La10-Oy / γ-Al2O3 with w (La) = 10% has a CO conversion of 99% or more in the temperature range of 110 ℃ to 170 ℃, and the catalyst selectivity is relatively high. The catalytic activity of Ru1-La10-Oy / Al2O3 catalyst regenerated by nitrogen, hydrogen and oxygen is different. The oxygenated catalyst has higher surface adsorbed oxygen content and better activity recovery.