Low-Temperature Water-Gas Shift Reaction over Au/ZrO₂ Catalysts Using Hydrothermally Synthesized Zirconia as Supports

详细信息	查看全文 | 推荐本文 |

• 作者：Yanjie ZHANG ; Yingying ZHAN ; Yanning CAO ; Chongqi CHEN ; Xingyi LIN ; Qi ZHENG ; ^{qizheng2005@gmail.com}
• 关键词：hydrothermal method ; hydrothermal synthesis temperature ; gold ; zirconia ; supported catalyst ; water-gas shift reaction
• 刊名：Chinese Journal of Catalysis
• 出版年：2012
• 期刊代码：3_18722067
• 类别：ce
• 出版时间：February-March, 2012
• 卷：33
• 期：2-3
• 页码：230-236
• 文件大小：431 K

摘要

Au/ZrO₂ catalysts with a nominal gold loading of 1.0%were prepared by a deposition-precipitation method employing a series of ZrO₂ samples synthesized by a convenient hydrothermal route as supports. These catalysts were evaluated for low-temperature water-gas shift reaction under a model reformed methanol gas atmosphere. The effect of the hydrothermal synthesis temperature of zirconia on the catalytic activity of Au/ZrO₂ was investigated. The optimal hydrothermal synthesis temperature of ZrO₂ was 150 掳C. The corresponding catalyst offers a CO conversion of 87%at a reaction temperature of 240 掳C, which is significantly higher than that of the previously reported Au/Fe₂O₃, Au/CeO₂, and Au/CeZrO₄ catalysts. The Au/ZrO₂ catalysts were characterized by X-ray diffraction, atomic absorption spectrometry, N₂-physisorption, and scanning electron microscopy. The results indicate that the catalytic performance of the Au/ZrO₂ catalysts is mainly influenced by the morphology and pore structure of the ZrO₂ that was hydrothermally synthesized at different temperatures. A uniform nanodisk morphology and increase in the pore volume and pore diameter of the ZrO₂ particles lead to a higher catalytic activity of the Au/ZrO₂ catalyst.