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环境化学  2015 

全Pd三效催化剂研究——涂层材料的研究

Keywords: Pd三效催化剂,涂层,氧化物添加剂,SO2中毒

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Abstract:

制备了作为Pd三效催化剂涂层材料组成的活性Al2O3/金属氧化物添加剂试样,用BET法、XRD法及H2-TPR法对这些涂层原材料体系进行表征。结果表明金属氧化物添加剂提高了活性Al2O3的热稳定性;添加ZrO2改善了CeO2的热稳定性;与含Ce的试样不同,含La试样没有贮氧能力。用含有Al2O3-CeO2/ZrO2和Al2O3-La2O3/BaO的涂层材料制备的Pd催化剂有好的CO,HC和NOx同时净化的三效性能和低的起燃活性。加入0.003%(V/V)SO2降低了催化剂活性,含La2O3/BaO涂层材料的Pd催化剂上NOx反应易被SO2中毒。

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