摘要
研究了在含氧 10 %的气氛中 ,贵金属元素Au复合LaCeMn钙钛矿系列稀土催化剂的NOx 还原性能。用比表面测定、X射线衍射、扫描电镜等方法分析了催化剂的结构、形貌 ,探讨了产生催化活性的机制。结果表明 ,以γ Al2 O3 为分散层 ,用盐溶液负载制备方法 ,在LaCeMn氧化物表面负载微量贵金属Au ,所制备的催化剂在富氧条件下其催化活性具有明显的改善。在 30 0～ 5 0 0℃温度区间内具有较好的NOx 还原性能 ,在 36 0～ 40 0℃最大还原效率可达 47%。Au负载量在 1g·L- 1 以内时 ,随着Au负载量增加 ,催化活性提高。另外 ,活性层的表面分散性和均匀性 。
The improvement of the reducibility of NO x by La Ce Mn catalyst due to the addition of gold was studied under a combustion gas flow containing 10% oxyen. The catalyst characteristics were analyzed by BET, XRD, SEM, etc. The results show that the performance of the synthesized perovskite catalyst with a little gold is evidently enhanced in lean combustion. Specially a satisfying reducibility for NO x decomposition was demonstrated between 300～500 ℃, and the maximum conversion rate reached 47% in the range of 360～400 ℃. When loading quantity of gold is less than 1.0 g·L -1 , the catalytic ability increases with the quantity. The micro particulate of gold in active coating can be seen by morphology analysis. Moreover, the surface distribution and uniformity of perovskite with gold have important influence on the reactive performance of catalyst.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2001年第5期402-405,共4页
Journal of the Chinese Society of Rare Earths
基金
教育部首批高等学校骨干教师资助计划项目
