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  • 1 Catalysis Division, CSIR-National Chemical Laboratory, Pune 411008, India
  • | 2 Surface Engineering Division, CSIR-National Aerospace Laboratories, Bangalore 560017, India
  • | 3 Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
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Abstract

Preferential oxidation of CO (CO-PROX) was carried out over Ni supported on CeO2 prepared by the co-precipitation method. The influence of metal loadings (2.5, 5 and 10 wt.% Ni) and the reaction conditions such as reaction temperature and feed composition on CO oxidation and oxidation selectivity were evaluated by using dry reformate gas. No other reactions like CO or CO2 methanation, coking, reverse water gas shift (RWGS) reaction is observed in the temperature range of 100–200 °C on these catalysts. Hydrogen oxidation dominates over CO oxidation above the temperature of 200 °C. An increase in oxygen leads to an increase in CO conversion but a simultaneous decrease in the O2 selectivity. It has been noticed that 5 and 10 % Ni/CeO2 show better catalytic activity towards CO-PROX reaction. These catalysts were characterized by SBET, XRD, TEM, XPS and H2-TPR.

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