Improvement of preferential co oxidation activity over cuo/co3o4-ceo2 catalysts: Effect of co/ce ratio

• RUI WANG ^[1] ; CHAO CHEN ^[1] ; SHENGJUN DENG ^[1] ; PAN SHEN ^[1] ; LEI GONG ^[1] ; NING ZHANG ^[1]
  1. [1] Nanchang University

     Nanchang University

     China

     
• Localización: Journal of the Chilean Chemical Society (Boletín de la Sociedad Chilena de Química), ISSN-e 0717-6309, ISSN 0366-1644, Vol. 59, Nº. 4, 2014, págs. 2710-2716
• Idioma: inglés
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• Resumen

  • A series of Co3O4-CeO2 supports with different Co/Ce ratio have been synthesized by using polyethyleneglycol (PEG) as a surfactant. The catalytic performance tests indicated the activity of the catalysts is better than the corresponding support. In addition, CuO/(0.7)Co3O4-CeO2 displayed the best activity with 100% CO conversion and 93% O2 selectivity at 120 °C. Furthermore, the stability test of CuO/(0.7)Co3O4-CeO2 expressed the activity can be retained at 80% for 80h at 100 °C. Catalysts and supports were characterized by BET, XRD, TPR and TPD techniques. Discussion of the results showed that the strongest lattice distortion and the best reducibility of Co3O4-CeO2 supports were both negative factors for the catalytic activity. More precisely, an appropriate Co/Ce ratio can restrain the stronger interaction between cobalt oxide and ceria to promote the formation of reducible copper species.