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http://dx.doi.org/10.7316/KHNES.2012.23.6.654

A Study on Na effect of Pt-Na/Ce(1-x)Zr(x)O2 Catalyst Structure for WGS Reaction  

Shim, Jae-Oh (Department of Environmental Engineering, Yonsei University)
Jeong, Dae-Woon (Department of Environmental Engineering, Yonsei University)
Jang, Won-Jun (Department of Environmental Engineering, Yonsei University)
Roh, Hyun-Seog (Department of Environmental Engineering, Yonsei University)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.23, no.6, 2012 , pp. 654-659 More about this Journal
Abstract
The interest in water gas shift (WGS) reaction has grown significantly, as a result of the recent advances in fuel cell technology and the need to develop small-scale fuel processors. Recently, researchers have tried to overcome the disadvantages of the commercial WGS catalysts. As a consequence, supported Pt catalysts have attracted a lot of researchers due to high activity and stability for WGS at low temperatures. In this study, $Pt-Na/Ce_{(1-x)}Zr_{(x)}O_2$ catalysts with various Ce/Zr ratio have been applied to WGS at a gas hourly space velocity (GHSV) of $45,515h^{-1}$. According to TPR patterns of $Pt-Na/Ce_{(1-x)}Zr_{(x)}O_2$ catalysts, the reducibility increases with decreasing the $ZrO_2$ content. As a result, Cubic structure $Pt-Na/Ce_{(1-x)}Zr_{(x)}O_2$ catalysts exhibited higher CO conversion than tetragonal structure $Pt-Na/Ce_{(1-x)}Zr_{(x)}O_2$ catalysts. Expecially, Pt-Na/$CeO_2$ exhibited the highest CO conversion as well as 100% selectivity to $CO_2$. Moreover, Pt-Na/$CeO_2$ catalyst showed relatively stable activity with time on stream. The high activity of cubic structure Pt-Na/$CeO_2$ catalyst was correlated to its higher oxygen storage capacity (OSC) of $CeO_2$ and easier reducibility of Pt/$CeO_2$.
Keywords
Water gas shift reaction; $Pt-Na/Ce_{(1-x)}Zr_{(x)}O_2$; Cubic structure; Oxygen storage capacity; Reducibility;
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Times Cited By KSCI : 1  (Citation Analysis)
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