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Water-gas shift reaction over supported Pt and Pt-CeOx catalysts

  • Catalysis, Reaction Engineering
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Abstract

A comparison study was performed of the water-gas shift (WGS) reaction over Pt and ceria-promoted Pt catalysts supported on CeO2, ZrO2, and TiO2 under rather severe reaction conditions: 6.7 mol% CO, 6.7 mol% CO2, and 33.2 mol% H2O in H2. Several techniques—CO chemisorption, temperature-programmed reduction (TPR), and inductively coupled plasma-atomic emission spectroscopy (ICP-AES)—were employed to characterize the catalysts. The WGS reaction rate increased with increasing amount of chemisorbed CO over Pt/ZrO2, Pt/TiO2, and Pt-CeO x /ZrO2, whereas no such correlation was found over Pt/CeO2, Pt-CeO x /CeO2, and Pt-CeO x /TiO2. For these catalysts in the absence of any impurities such as Na+, the WGS activity increased with increasing surface area of the support, showed a maximum value, and then decreased as the surface area of the support was further increased. An adverse effect of Na+ on the amount of chemisorbed CO and the WGS activity was observed over Pt/CeO2. Pt-CeO x /TiO2 (51) showed the highest WGS activity among the tested supported Pt and Pt-CeOx catalysts. The close contact between Pt and the support or between Pt and CeO x , as monitored by H2-TPR, is closely related to the WGS activity. The catalytic stability at 583K improved with increasing surface area of the support over the CeO2- and ZrO2-supported Pt and Pt-CeO x catalysts.

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Authors and Affiliations

  1. Division of Energy Systems Research and Division of Chemical Engineering and Materials Engineering, Ajou University, Wonchun-dong, Yeongtong-gu, Suwon, 443-749, Korea

    Yong Tae Kim & Eun Duck Park

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  1. Yong Tae Kim
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  2. Eun Duck Park
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Correspondence to Eun Duck Park.

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Kim, Y.T., Park, E.D. Water-gas shift reaction over supported Pt and Pt-CeOx catalysts. Korean J. Chem. Eng. 27, 1123–1131 (2010). https://doi.org/10.1007/s11814-010-0210-y

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  • DOI: https://doi.org/10.1007/s11814-010-0210-y

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