Effect of Cu Loading to Catalytic Selective CO Oxidation of CuO/CeO₂ –Co₃O₄

P. Aunbamrung, A. Wongkaew

Department of Chemical Engineering, Faculty of Engineering, Burapha University, Chonburi, Thailand.

DOI: 10.4236/aces.2013.34B003                

Abstract

This work studied CuO/CeO₂-Co₃O₄ with wt% Ce:Co ratio 95:5 for selective CO oxidation with effect of  wt% Cu loading. The catalysts were prepared by co-precipitation. Characterizations of catalysts were carried out by XRD and BET techniques. The results showed a good dispersion of CuO for 5 wt% Cu loading catalysts and showed high specific surface area of catalyst. For selective CO oxidation, both 5CuO and 30CuO catalysts could remove completely CO in the presence of excess hydrogen at 423 K and 20CuO could eliminate CO completely at 443 K. Moreover, considering the selectivity to CO oxidation, the 5CuO catalyst has shown the highest selectivity of 85% while the 30CuO catalyst obtains the selectivity of 65% at the reaction temperature of 423 K.

Keywords

Selective CO Oxidation; CuO/CeO₂ –Co₃O₄; Cu Loading; Ce:Co Ratio; Co-precipitation

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	O. Bicakova and P. Straka, “Production of Hydrogen from Renewable Resource and its Effectiveness,” International Journal of Hydrogen Energy, Vol. 33, 2008, pp. 1335-1344.
[2]	Z. Nada and L. Xianguo, “Transient of Carbon Monoxide Poisoning and Oxygen Bleeding in a PEM Fuel Cell Anode Catalyst Layer,” International Journal of Hydrogen Energy, Vol. 33, 2008, pp. 1335-1344.
[3]	A. Mishra and R. Prasad, “A Review on Preferential Oxidation of Carbon Monoxide in Hydrogen Rich Gas,” Bulletin of Chemical Reaction Engineering & Catalysis, Vol. 6, No. 1, 2011, pp. 1-14.
[4]	G. Avgouropoulos, T. Ioannides, C. Papadopoulou, J. Batista, S. Hocevar and H. K. Matralis, “A Comparative Study of Pt/γ-Al2O3, Au/α-Fe2O3 and CuO–CeO2 Catalysts for the Selective Oxidation of Carbon Monoxide in Excess Hydrogen,” Catalysis Today, Vol. 75, 2002, pp. 157-167. doi:10.1016/S0920-5861(02)00058-5
[5]	S. Salvatore, C. Carmelo, P. M. Riccobenea, P. Giacomo and P. Alessandro, “Selective Oxidation of CO in H2-rich Stream over Au/CeO2 and Cu/CeO2 Catalysts: An Insight on the Effect of Preparationmethod and Catalyst Pretreatment,” Applied Catalysis A: General, Vol. 417- 418, 2012, pp. 66-75.
[6]	M. Kang, M. W. song and C. H. Lee, “Catalytic Carbon Monoxide Oxidation over CoOx/CeO2 Composite Catalysts,” Applied Catalysis A: General, Vol. 255, 2003, pp. 143-156. doi:10.1016/S0926-860X(03)00324-7
[7]	Z. Liu, R. Zhou and X. Zheng, “Influence of Preparation Methods on CuO-CeO2 Catalysts in the Preferential Oxidation of CO in Excess Hydrogen,” Journal of National Gas Chemistry, Vol. 17, 2008, pp. 125-129.
[8]	J. L. Ayastuy, E. Fernandez-Puertas, M. P. Gonzalez-Marcos and M. A. Guitierrez-Ortiz, “Transition metal Promoters in CuO/CeO2 Catalysts for CO Removal from Hydrogen-streams,” International Journal of Hydrogen Energy, Vol. 37, 2012, pp. 7385-7397. doi:10.1016/j.ijhydene.2012.02.007
[9]	S. Christopher, H. Nair and D. Chelsey, “Study of Active Sites and Mechanism Responsible for Highly Selective CO Oxidation in H2 Rich Atmospheres on a Mixed Cu and Ce Oxide Catalyst,” Journal of Catalysis, Vol. 266, 2009, pp. 308-319. doi:10.1016/j.jcat.2009.06.021
[10]	M. Meng, Y. Liu, W. L. Z.Sun, L. Zhang and X. Wang, “Synthesis of Highly-dispersed CuO-CeO2 Catalyst Through a Chemi-sorption-hydrolysis Route for CO Preferential Oxidation in H2-rich Stream,” International Journal of Hydrogen Energy, Vol. 37, 2012, pp. 14133-14142. doi:10.1016/j.ijhydene.2012.07.075
[11]	J. W. Park, J. H. Joeng, W. L. Yoon, C. S. Kim, D. K. Lee, Y. K. park and Y. W. Rhee, “Selective Oxidation of CO in Hydrogen-rich Stream over Cu-Ce Catalyst Promoted with Transition Metal,” International Journal of Hydrogen Energy, Vol. 30, 2005, pp. 209-220. doi:10.1016/j.ijhydene.2004.04.016
[12]	S. Chang, M. Li, Q. Hua, L. Zhang, Y. Ma, B. Ye and W. Huang, “Shape-dependent Interplay between Oxygen Vacancies and Ag–CeO2 Interaction inAg/CeO2 Catalysts and Their Influence on the Catalytic Activity,” Journal of Catalysis, Vol. 293, Vol. 30, 2012, pp. 195-200.