摘要
研究了以表面修饰改性的纳米A l2O3和(Ce-Zr-O2)x复合氧化物做载体负载CuO的催化剂,以及选择性催化氧化富氢气氛中CO催化活性和选择性.结果表明,助剂Ce掺杂的纳米A l2O3负载CuO对CO的氧化活性、选择性明显优于助剂K,M g,Zn,Zr掺杂的催化剂.w(Ce)为20%,催化剂对CO的氧化活性最高.与浸渍法相比,助剂以沉积沉淀法加入催化剂具有更高的活性.CeO2在载体中的掺杂对提高CO的催化氧化活性和选择性起关键作用.(Ce-Zr-O2)x复合氧化物做载体比单纯的纳米A l2O3有利于CO催化氧化选择性的提高.Cu-Ce二元复合氧化物作载体时,催化剂活性最高,CO的完全转化温度在105℃.Cu-Zr复合氧化物作载体时,催化活性较差.降低CO氧化反应温度是提高富氢气氛中CO选择性氧化的关键.
The activity and selectivity for CO selective catalytic oxidation in hydrogen-rich gas on nanosized oxides with surface modification and （Ce-Zr-O2）x composites supported CuO catalysts were investigated. The results show that the activity and selectivity for CO oxidation on nanosized oxides supported CuO catalysts by adding Ce are much higher than that by adding K, Mg, Zn and Zr. CO activity is the highest by adding w（Ce） of 20%. The catalyst produced by depositionprecipitation mixed with promoter is of higher activity than that by impregnation. CeO2 doped into support plays a critical role in improving the activity and selectivity of CO oxidation. The catalytic selectivity of CO with （Ce-Zr-O2）x composites as carrier is much higher than that with nano-Al2O3. The acitivity of Cu-Ce binary composite supported CuO catalysts is the highest and CO complete conversion temperature is 105C. The catalyst with Cu-Zr binary composite as carrier has a lower acitivity for CO oxidation. The pivotal factor of CO selective oxidation in hydrogen-rich gas is decreasing CO oxidation reaction temperature.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2005年第6期774-778,共5页
Journal of China University of Mining & Technology
基金
江苏石油化工省重点实验室项目(KJS02112)
