Activity, selectivity and stability of praseodymium-doped CeO₂ for chlorinated VOCs catalytic combustion

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• 作者：B. de Rivas^a ; N. Guillé ; n-Hurtado^b ; R. Ló ; pez-Fonseca^a ; F. Coloma-Pascual^b ; A. Garcí ; a-Garcí ; a^b ; J.I. Gutié ; rrez-Ortiz^a ; A. Bueno-Ló ; pez^b ; ^agus@ua.es
• 关键词：Chlorinated VOC combustion ; 1 ; 2-Dichloroethane ; CexPr1&minus ; xO2 ; Cerium&ndash ; praseodymium mixed oxide
• 刊名：Applied Catalysis B ; Environmental
• 出版年：2012
• 期刊代码：4_09263373
• 类别：ce
• 出版时间：13 June, 2012
• 卷：121-122
• 期：Complete
• 页码：162-170
• 文件大小：939 K

摘要

Ce-Pr mixed oxides, namely Ce_0.8Pr_0.2O₂, Ce_0.5Pr_0.5O₂ and Ce_0.2Pr_0.8O₂, were prepared by conventional coprecipitation and evaluated for the catalytic combustion of 1,2-dichloroethane, which was selected as a model reaction for chlorinated VOC abatement. For comparison purposes, the pure oxides were also prepared and catalytically tested. A certain decrease in catalytic activity was observed after three consecutive temperatures cycles from 150 to 500 掳C for all catalysts, except for Ce_0.5Pr_0.5O₂. This deactivation was particularly noticeable for pure praseodymia and Ce_0.2Pr_0.8O₂, while Ce_0.8Pr_0.2O₂ and Ce_0.5Pr_0.5O₂ exhibited a superior stability. The catalysts deactivation was attributed to bulk and/or surface chlorination, as revealed by X-ray diffraction, Raman spectroscopy and X-ray photoelectron spectroscopy. Interestingly, the Ce_0.5Pr_0.5O₂ mixed oxide, which converted the chlorinated feed at the lowest temperature due to its substantial resistance to chlorination, showed a constant activity in a 115 h lifetime test at 335 掳C.