作　　者： ; ; ; ; ;

机构地区： 汕头大学理学院化学系

出　　处： 《精细化工》 2002年第12期720-726,共7页

摘　　要： 利用浸渍法制备含Ce-La稀土助剂改性的Pt-Rh三效催化剂,采用多种表征手段和高温抗硫水热老化实验,考察Ce-La稀土对Al2O3载体的热稳定性和催化剂活性的影响。结果表明:稀土La2O3的添加主要改善载体Al2O3的高温高比表面性能;CeO2的引入明显提高了CO和NO的催化转化活性,但对HC的转化几乎无影响;CeO2的添加也促进了催化剂的抗硫水热老化性能,并显著拓宽催化剂的三效窗口。主要归因于CeO2的添加促进了催化剂上CO、HC和NO间的相互作用以及CeO2所特有的储氧功能。 A series of Ce-La promoted Pt-Rh catalysts were prepared by wet impregnation method and evaluated by characterization method and aging experiments under SO2 and water vapor at 900 ℃.The results showed that La2O3 could stabilize BET surface area at high temperature,and CeO2 might significantly increase the conversion activities of CO and NO but had no effect on the conversion of HC.Addition of CeO2 also improved the thermal stability in the presence of SO2 and water vapor in feed and widened the window of threeway catalyst.This might be mainly due to oxygenstoring capability and interaction of CO,HC and NO.

关 键 词： 汽车尾气 稀土催化剂 热稳定性 催化活性 稀土助剂

领　　域： [化学工程]