论文部分内容阅读
采用浸渍法制备系列Ru-La2O3/γ-Al2O3复合氧化物催化剂,通过XRD、H2-TPR、CO-TPR、XPS、BET等方法对催化剂进行表征,考察La2O3的加入量、预处理方法对催化剂上CO选择氧化性能的影响.结果表明,110-170℃时Ru1La6/Al2O3催化剂上CO转化率达到99%以上,氧气利用率达55.7%以上.和Ru/Al2O3相比,Ru1La6/Al2O3催化剂在较低温度具有高活性,活性温度区间变宽.适量La2O3的加入促进了活性组分在载体表面分散,提高了催化剂的活性.经氢气预处理的Ru1La6/Al2O3催化剂活性最佳,催化剂上Ru物种结合能降低,表面钌物种活性位增多,且表面晶格氧浓度增大,更有利于CO气体在催化剂表面上的氧化反应.
The catalysts were characterized by XRD, H2-TPR, CO-TPR, XPS and BET, respectively. The amount of La2O3 added was investigated. The effects of pretreatment methods on the catalyst The results showed that the conversion of CO over Ru1La6 / Al2O3 reached more than 99% and the oxygen utilization rate reached 55.7% at 110-170 ℃ .Compared with Ru / Al2O3, Ru1La6 / The temperature is high activity and the active temperature range is widened.The addition of proper amount of La2O3 promotes the dispersion of the active component on the surface of the carrier and improves the activity of the catalyst.The Ru1La6 / Al2O3 catalyst pretreated by hydrogen has the best activity, the Ru species binding energy The active sites of ruthenium species increase, and the surface lattice oxygen concentration increases, which is more conducive to the oxidation of CO gas on the catalyst surface.