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Macroporous Monolithic Pt/γ-Al2O3 and K–Pt/γ-Al2O3 Catalysts Used for Preferential Oxidation of CO

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Abstract

Macro-porous monolithic γ-Al2O3 was prepared by using macro-porous polystyrene monolith foam as the template and alumina sol as the precursor. Platinum and potassium were loaded on the support by impregnation method. TG, XRD, N2 adsorption–desorption, SEM, TEM, and TPR techniques were used for catalysts characterization, and the catalytic performance of macro-porous monolithic Pt/γ-Al2O3 and K–Pt/γ-Al2O3 catalysts were tested in hydrogen-rich stream for CO preferential oxidation (CO-PROX). SEM images show that the macropores in the macro-porous monolithic γ-Al2O3 are interconnected with the pore size in the range of 10 to 50 μm, and the monoliths possess hierarchical macro-meso(micro)-porous structure. The macro-porous monolithic catalysts, although they are less active intrinsically than the particle ones, exhibit higher CO conversion and higher O2 to CO oxidation selectivity than particle catalysts at high reaction temperatures, which is proposed to be owing to its hierarchical macro-meso(micro) -porous structure. Adding potassium lead to marked improvement of the catalytic performance, owing to intrinsic activity and platinum dispersion increase resulted from K-doping. CO in hydrogen-rich gases can be removed to 10 ppm over monolithic K–Pt/γ-Al2O3 by CO-PROX.

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Acknowledgments

The financial support of this work by Hi-tech Research and Development Program of China (863 program, Granted as No. 2006AA05Z115 and 2007AA05Z104) and the Cheung Kong Scholar Program for Innovative Teams of the Ministry of Education (No IRT0641) are gratefully acknowledged.

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Authors and Affiliations

  1. Tianjin Key Laboratory of Applied Catalysis Science and Engineering, Department of Catalysis Science and Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China

    Yuan Zhang, Cun Yu Zhao, Hao Liang & Yuan Liu

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  1. Yuan Zhang
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  2. Cun Yu Zhao
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  3. Hao Liang
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Correspondence to Yuan Liu.

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Zhang, Y., Zhao, C.Y., Liang, H. et al. Macroporous Monolithic Pt/γ-Al2O3 and K–Pt/γ-Al2O3 Catalysts Used for Preferential Oxidation of CO. Catal Lett 127, 339–347 (2009). https://doi.org/10.1007/s10562-008-9686-z

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  • DOI: https://doi.org/10.1007/s10562-008-9686-z

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