Ce-based oxides were prepared by citric acid complex method and characterized by nitrogen physisorption, XRD, BET, H2-TPR and XPS; their catalytic performances in simultaneous removal of diesel soot and NOx were investigated on a thermogravimetric apparatus and a tubular reactor. Co0.1/CeLa0.05 prevailed over all the detected materials in catalytic performance for simultaneous removal of soot and NOx. T50 of this catalyst (temperature for 50% soot combustion)was 301℃, and the yield of N2 was 41.4%. A majority of cobalt oxides were dispersed on the surface of Ce-La solid solution. The mutual transformation between Co3+ and Co2+enhanced the redox ability and oxygen storage capacity of pure ceria oxide, achieving lower temperature of combustion. Cerium-cobalt complex oxide doped with lanthanum presented a tremendous increase of surface area, leading to higher yield of N2. The formation of trace amount of LaCoO3 promoted oxygen vacancies creation, thus affecting positively to the soot combustion activity.
|Number of pages||8|
|Journal||Journal of Molecular Catalysis|
|Publication status||Published - Feb 1 2015|
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