Preparation, characterisation and testing of CuO/Ce_0.8Zr_0.2O₂ catalysts for NO oxidation to NO₂ and mild temperature diesel soot combustion

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• 作者：Javier Gimé ; nez-Mañ ; ogil ; Agustí ; n Bueno-Ló ; pez ; Avelina Garcí ; a-Garcí ; a ; ^{a.garcia@ua.es" class="auth_mail}
• 关键词：Copper content ; NOx  ; +  ; O2 ; Ce0.8Zr0.2O2 ; NO oxidation to NO2 ; Diesel soot combustion.
• 刊名：Applied Catalysis B: Environmental
• 出版年：25 June, 2014
• 年：2014
• 卷：152-153
• 期：Complete
• 页码：99-107
• 全文大小：2271 K

文摘

CuO/ceria-zirconia catalysts have been prepared, deeply characterised (N₂ adsorption-desorption isotherms at 鈭?96 掳C, XRD, Raman spectroscopy, XPS, TEM and H₂-TPR) and tested for NO oxidation to NO₂ in TPR conditions, and for soot combustion at mild temperature (400 掳C) in a NO_x/O₂ stream. The behaviour has been compared to that of a reference Pt/alumina commercial catalyst. The ceria-zirconia support was prepared by the co-precipitation method, and different amounts of copper (0.5, 1, 2, 4 and 6 wt%) were loaded by incipient wetness impregnation.

The results revealed that copper is well-dispersed onto the ceria-zirconia support for the catalysts with low copper loading and CuO particles were only identified by XRD in samples with 4 and 6% of copper. A very low loading of copper increases significantly the activity for the NO oxidation to NO₂ with regard to the ceria-zirconia support and an optimum was found for a 4% CuO/ceria-zirconia composition, showing a very high activity (54% at 348 掳C). The soot combustion rate at 400 掳C obtained with the 2% CuO/ceria-zirconia catalyst is slightly lower to that of 1% Pt/alumina in terms of mass of catalyst but higher in terms of price of catalyst.