物理化学学报 >> 2004, Vol. 20 >> Issue (04): 428-431.doi: 10.3866/PKU.WHXB20040421

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Au/SnO2的制备及其低温CO氧化催化性能

王淑荣;吴世华;石娟;郑修成;黄唯平   

  1. 南开大学化学系,天津　300071
  • 收稿日期:2003-09-23 修回日期:2003-11-28 发布日期:2004-04-15
  • 通讯作者: 吴世华 E-mail:jackmxd808@163.com

Preparation and Catalytic Activity of Au/SnO2 for Low-temperature CO Oxidation

Wang Shu-Rong;Wu Shi-Hua;Shi Juan;Zheng Xiu-Cheng;Huang Wei-Ping   

  1. Department of Chemistry, Nankai University, Tianjin　300071
  • Received:2003-09-23 Revised:2003-11-28 Published:2004-04-15
  • Contact: Wu Shi-Hua E-mail:jackmxd808@163.com

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摘要： 用沉积-沉淀法制备了不同金含量的Au/SnO2催化剂.采用XRD和UV-Vis等手段对催化剂样品进行了表征并考察了沉积溶液的pH值、金的负载量、焙烧温度和气氛等对Au/SnO2催化CO氧化活性的影响.结果表明：当沉积溶液的pH=9～10时,所制得的金属金的平均粒径最小；随着金的负载量的增大,金属金的粒径增大, Au/SnO2的催化活性降低；在所研究的条件下, Au/SnO2前驱体在空气中473 K下焙烧4 h,得到的催化剂活性最高；在氢气中373 K下处理2 h的Au/SnO2的催化活性在所有样品中是最高的.

关键词: Au/SnO2催化剂, 沉积-沉淀法, 催化活性, 低温CO氧化

Abstract: Three Au/SnO2 catalysts with different gold loading were prepared via deposition-precipitation method, and characterized by XRD and UV-Vis. The effects of pH of deposition solution, Au loading and pretreatment condition on the catalytic activity of Au/SnO2 catalysts for low-temperature CO oxidation were investigated. The results showed that (1) the mean Au particle size of Au/SnO2 catalyst prepared at pH=9～10 deposition condition was the smallest among the samples obtained at different deposition pH; (2) the catalytic activity decreased with the increase of Au loading; (3) among the 2％Au/SnO2 catalyst samples calcined at different temperatures in air for 4 h, the catalytic activity of the sample calcined at 473 K was the highest; (4) the catalyst samples pretreated at low temperature in H2 exhibited higher activity, and the activity of the sample obtained at 373 K for 2 h was the highest among all Au/SnO2 samples in this work.

Key words: Au/SnO2 catalyst, Deposition-precipitation method, Catalytic activity, Low-temperature CO oxidation