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The action of VOx doping on Au/CeO2 catalysts for CO oxidation and water–gas shift reaction

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Abstract

VOx–CeO2 oxides with different Ce/V molar ratios were prepared via solution combustion synthesis method. Au/VOx–CeO2 catalysts were obtained by the impregnation method for CO oxidation and water–gas shift reaction (WGSR). The textural properties and structures of these materials were investigated by the techniques such as nitrogen physical adsorption, X-ray diffraction, UV–Visible spectroscopy, temperature-programmed reduction, and X-ray photoelectron spectroscopy. The following activity orders are obtained: Au/CeO2 ~ Au/Ce9V1 > Au/Ce7V3 > Au/Ce5V5 for CO oxidation at 20 °C and Au/Ce9V1 > Au/CeO2 > Au/Ce7V3 > Au/Ce5V5 for WGSR at 350 °C. CO oxidation proceeds more easily than WGSR at the same catalyst. The catalysts with low VOx content show better activities. The addition of high VOx content to CeO2 leads to the agglomeration of polymeric VOx or polyvanadate species. These species make the reduction of CeO2 more difficult and the interaction between gold and CeO2 weak. The presence of Au effectively enhances the reduction of CeO2 to lower temperatures. The interaction between gold, VOx, and CeO2 is favorable to improving the activity of Au/VOx–CeO2 catalyst.

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Acknowledgments

The work was supported by Natural Science Foundation of China (Grant 20973148 and 21273193) and by Natural Science Foundation of Shandong, China (Grant ZR2011BM024). The authors also gratefully thank Mrs. Ling Gao from Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, for XPS analysis.

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  1. Institute of Applied Catalysis, Yantai University, Yantai, 264005, China

    Weiping Liao, Hongying Lv & Zhanghuai Suo

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  1. Weiping Liao
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  2. Hongying Lv
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  3. Zhanghuai Suo
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Correspondence to Zhanghuai Suo.

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Liao, W., Lv, H. & Suo, Z. The action of VOx doping on Au/CeO2 catalysts for CO oxidation and water–gas shift reaction. Reac Kinet Mech Cat 116, 491–506 (2015). https://doi.org/10.1007/s11144-015-0921-5

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