Study the Effect on Activity of Alumina Supported CuO-CeO2-ZrO2 Catalysts Prepared by Four Methods for CO Oxidation

Gaurav Rattan; R. Prasad

Gaurav Rattan Dr.S.S.Bhatnagar University Institute of Chemical Engineering & Technology, Panjab University, Chandigarh 160014, India
R. Prasad Department of Chemical Engineering & Technology, IIT-BHU., Varanasi 221005, India

Keywords: CO Oxidation\, Alumina, Sol-Gel, Combustion, Oxidation, Ceria, Catalyst

Abstract

In the present study four catalysts, prepared by four different methods i.e. co- impregnation, citric acid sol-gel, urea nitrate combustion and urea gelation co- precipitation methods, have been used to study the effect of CO oxidation. The precursor Cu(NO₃)₂3H₂O has been used as for the preparation of catalysts having the composition CuCe_5.17Zr_3.83Ox/-Al₂O₃(25wt%). Catalysts were calcined at 500^oC and characterized by BET, XRD, TGA/DSC and SEM. A fixed weight (100 mg) of the catalyst was taken in a tubular fixed bed reactor at atmospheric pressure. 2.0% CO in air at a total feed rate of 60 ml/min was used in the reactor. The oxidation of CO to carbon dioxide was carried out at temperature ambient to 280^oC. The preparation methods effect the catalytic activity of the catalysts as is discussed in the results. Excellent activity for CO oxidation is shown by the catalyst prepared by sol – gel method followed by co-impregnation, urea gelation and urea nitrate combustion methods. It exhibited the total conversion at 210^oC. All the four catalysts prepared did not show any deactivation activity for 50 hours of continuous runs.

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