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《Journal of Chemical Engineering of Chinese Universities》 2009-06
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The Preparation of Monolithic La_(0.8)Sr_(0.2)MnO_3 Catalysts and its Performance for VOCs Catalytic Combustion

LU Han-feng, HUANG Hai-feng, LIU Hua-yan, CHEN Yin-fei, LIU Hua-zhang (College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310014, China)  
The 316L wire-mesh honeycomb and the ceramic honeycomb (cordierite) coated separately with a thick layer of γ-Al2O3, were prepared by electrophoretic deposition and wash-coating, respectively. The subsequent depositions of 2.0%(wt) La0.8Sr0.2MnO3 on the coated monoliths were performed by impregnation method. The SEM images show that the La0.8Sr0.2MnO3 particles with size of 100 nm are dispersed on the surfaces of wire-mesh honeycomb and ceramic honeycomb; they combine strongly with the structured support and lose only 5.0%(wt) after vibration for 30 min. The monolithic catalysts have no cracks happened after being treated at 550℃ for 5 h. The catalytic activities of the La0.8Sr0.2MnO3 powder and monolithic catalysts exposed in toluene combustion both in fixed bed and in monolithic reactor were measured. The results show that the La0.8Sr0.2MnO3 powder, wire-mesh honeycomb and ceramic honeycomb catalysts show almost the similar catalytic performance. The wire-mesh honeycomb catalyst exhibits better mass transfer characteristic and higher thermal response rate, and it is more adaptable to be used for treating VOCs with large blast volume and big temperature fluctuation.
【Fund】: 浙江省科技厅重大专项资助(2007C13042)
【CateGory Index】: TQ426.6
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