机构地区: 广州大学生物与化学工程学院
出 处: 《云南大学学报(自然科学版)》 2005年第S1期358-363,共6页
摘 要: 系统地比较了CuO/ZrO2,CuO/MnO2,CuO/CoO和CuO/CeO24种催化剂体系对重整气体中CO选择性氧化反应的活性,采用TPR,XRD和SEM等方法考察了催化剂的还原特性及不同Cu,Ce含量对CuO/CeO2还原性能的影响.实验结果表明:除了CuO/ZrO2催化剂之外,其它催化剂中CuO与CoO、CeO2或者MnO2之间存在相互作用,导致催化剂的还原温度降低.CuO/ZrO2催化剂显示较差的催化活性,而CuO/CeO2催化剂的活性较高,其中CuO(x=10%)/CeO2催化剂在140℃和160℃下具有较高的CO转化率和选择性,V=9%水蒸气的加入降低了CuO/CeO2催化剂的反应活性和选择性。SEM测试发现新鲜和失活后的CuO(x=10%)/CeO2表面形貌变化较大,这可能是催化剂失活的原因之一. CD selective oxidation in reformed fuel over four catalytic systems of CuO/ZrO2, CuO/MnO2, CuO/ CoO and CuO/CeO2 were compared. The reducibility of these catalysts and the effect of CuO and CeO2 molar ratio of CuO/CeO2 catalysts on the activity of selective CD oxidation are investigated by XRD, TPR methods. The results show that the catalysts excluding CuO/ZrOz have the interactions between CuO and CoO, CeO2 or MnO2, which result in a decrease of the reduction temperature. CuO/ZrO2 catalyst shows the lowest...