Lee SY  Lee SH  Cheon JK  Woo HC

Vol. 13,  No. 1, pp. 54-63, Mar.  2007

일산화탄소 산화반응 담지 Cu 촉매 산소 저장능력 세리아-지르코니아 수소정제

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Even traces of CO in the hydrogen-rich feed gas to proton exchange membrane fuel cells (PEMFC) poison the platimun anode electrode and dramatically decrease the power output. In this work, a variety of catalytic materials consisting of Cu/CexZr1-xO2 (x=0.0-1.0) were synthesised, characterized and tested for CO oxidation and preferential oxidation of CO (PROX). These catalysts prepared by hydrothermal and deposition-precipitation methods. The catalysts were characterized by XRD, XRF, SEM, BET, N2O titration and oxygen storage capacity (OSC) measurement. The effects of composition of the support and degree of excess oxygen were investigated for activity and CO2 selectivity with different temperatures. The composition of the support markedly influenced the PROX activity. Among the various Cu/CexZr1-xO2 catalysts having different composition, Cu/Ce0.9Zr0.1O2 and Cu/Ce0.7Zr0.3O2 showed the highest activities (>99%) and selectivities (ca.50%) in the temperature range of 150~160℃. It was found that by using of Cexzr1-xO2 mixed oxide support which possesses a high oxygen storage capacity, oxidation-reduction activity of Cu-based catalyst was improved, which resulted in the increase of catalytic activity and selectivity of CO oxidation in excess H2 environments.