Effects of preparation method of CeOx-Al2O3 on the thermostability and activity of the monolith supported Pt-Rh catalysts for automotive exhaust control
Effects of preparation method of CeOx-Al2O3 on the thermostability and activity of the monolith supported Pt-Rh catalysts for automotive exhaust control
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CeOx-Al2O3制备方法对整体负载Pt-Rh汽车尾气催化剂热稳定性和活性的影响
DOI：
10.1007/bf00814227
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发表时间：
1995
影响因子：
2.8
通讯作者：
M. Watanabe
中科院分区：
文献类型：
--
作者：
K. Masuda;T. Sano;F. Mizukami;M. Watanabe
制备了不同的CeOx-Al_2O_3粉末，考察了载体制备方法对混合氧化铝担载铂催化剂热稳定性的影响及其对CO氧化的影响。结果表明，络合剂辅助的溶胶-凝胶法是提高氧化铝负载混合铂催化剂热稳定性的有效方法。用这些氧化铝和其他耐热氧化铝(包括Ba2+)制备了整体式铂-Rh三效催化剂。对催化剂进行加速热机老化后，考察了催化剂的活性，以考察催化剂的耐久性。在汽车发动机的正常工作条件下，用络合剂辅助溶胶-凝胶法制备的CeOx-Al_2O_3载体制备的铂-Rh三效催化剂的活性与用同样的溶胶-凝胶法制备的BaO-Al_2O_3粉末浸渍CeO_x制备的催化剂的活性接近。
Various CeOx-Al2O3 powders were prepared and the influence of the method of support preparation on the thermostability of the mixed alumina-supported Pt catalysts and on their oxidation of CO was investigated. It was found that the complexing agent-assisted sol-gel method is effective in improving the thermostability of the mixed alumina-supported Pt catalysts. Monolith Pt-Rh three-way catalysts were prepared using these aluminas and other thermostable alumina including Ba. Activity of the catalysts was also investigated after conducting accelerated thermal engine aging in order to test their durability. Under normal operating conditions of the automobile engine, the activity of the Pt-Rh three-way catalyst using the CeOx-Al2O3 support prepared by the complexing agent-assisted sol-gel method is nearly equal to that of the catalyst using the CeOx impregnated onto BaO-Al2O3 powder prepared by the same sol-gel method.