催化学报

催化学报 ›› 2011, Vol. 32 ›› Issue (4): 652-656.DOI: 10.3724/SP.J.1088.2011.01218

• 研究论文 • 上一篇    下一篇

凹凸棒石负载的 Cu-Mn-Ce 催化剂上甲苯氧化反应性能

宋磊, 陈天虎, 李云霞, 刘海波, 孔德军, 陈冬   

  1. 合肥工业大学资源与环境工程学院, 安徽合肥 230009
  • 收稿日期:2010-12-09 修回日期:2011-02-06 出版日期:2011-04-18 发布日期:2014-08-30

Performance of Palygorskite Supported Cu-Mn-Ce Catalyst for Catalytic Oxidation of Toluene

SONG Lei, CHEN Tianhu*, LI Yunxia, LIU Haibo, KONG Dejun, CHEN Dong   

  1. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, Anhui, China
  • Received:2010-12-09 Revised:2011-02-06 Online:2011-04-18 Published:2014-08-30

PDF

1162

被引次数

77

摘要： 采用浸渍法制备了凹凸棒石 (PG) 负载 Cu-Mn-Ce 催化剂, 运用 X 射线衍射、透射电镜和 H2 程序升温还原等方法对催化剂进行了表征, 并将催化剂用于氧化降解甲苯反应中, 考察了不同活性组分、Ce 添加量以及催化剂焙烧温度对催化剂活性的影响, 探讨了催化剂中活性组分的存在形式及与催化氧化活性的关联. 结果表明, 催化剂中 Cu, Mn 和 Ce 分别以 CuO, Mn2O3 和 CeO2 的形式负载于棒状结构的 PG 表面, 且呈高度分散的纳米颗粒. Ce 的添加促进了 CuMn2O4 尖晶石结构的形成, 且显著提高了甲苯转化率. 当 Ce/Cu 摩尔比为 0.3 且在 500 oC 焙烧时催化剂活性最高, 288 oC 时甲苯转化率达到了 99%.

关键词: 凹凸棒石, 铜, 锰, 铈, 催化氧化, 挥发性有机污染物, 甲苯

Abstract: A series of Cu-Mn catalyst samples with Ce additive supported on palygorskite (PG) were prepared by the wet impregnation method. The catalyst structure was characterized by X-ray diffraction, transmission electron microscopy (TEM), and temperature-pro- grammed reduction with H2. The state of various active species and their reducibility were investigated and correlated with catalytic performance of the catalyst. The catalyst activity was examined using toluene as a model volatile organic compound. The effect of different active species, the amount of Ce additive, and catalyst calcination temperature on toluene conversion was investigated. The results demonstrated that the active species of the catalyst were loaded on the surface of PG in the form of CuO, Mn2O3, and CeO2, and highly dispersed nanoparticles of the species were observed by TEM. The addition of Ce improved the growth of spinal CuMn2O4 and increased toluene conversion. When molar ratio of Ce/Cu was 0.3, the catalyst showed the highest activity. Toluene conversion reached 99% over the Cu-Mn-Ce/PG catalyst at 288 oC.

Key words: palygorskite, copper, manganese, cerium, catalytic oxidation, volatile organic compound, toluene