Preferential oxidation of CO in H2 stream over Au/MnO 2-CeO2 catalysts

Li Hsin Chang, Natarajan Sasirekha, Yu Wen Chen, Wei Jye Wang

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Abstract

A series of nanosized gold supported on CeO2, MnO2, and MnO2-CeO2 composite oxides have been prepared by a deposition-precipitation (DP) method and the effects of Mn/Ce atomic ratio on Au/MnO2-CeO2 catalysts and calcination temperature after loading gold for preferential oxidation of CO (PROX) in H2 stream have been investigated using a fixed-bed continuous-flow reactor at various temperatures. The catalysts were characterized by XRD, nitrogen sorption, TEM, and XPS. XRD analysis confirms the phase purity of CeO2 and MnO 2 phases and the fine dispersion of Au on Au/MnO2-CeO 2 catalysts. XPS analysis shows the formation of MnO 2-CeO2 solid phase with manganese loading on ceria support accompanied by an increase in Ce4+ surface concentration. ICP-AES demonstrates the increase in gold loading with manganese addition by DP method. A synergistic catalytic effect on conversion and selectivity was observed in the case of Au/MnO2-CeO2 catalysts, due to the coexistence of metallic and nonmetallic gold species within nano gold particle and the minor presence of Ce3+ species.

Original languageEnglish
Pages (from-to)4927-4935
Number of pages9
JournalIndustrial and Engineering Chemistry Research
Volume45
Issue number14
DOIs
StatePublished - 5 Jul 2006

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