催化学报

催化学报 ›› 2009, Vol. 30 ›› Issue (11): 1085-1090.

• 研究论文 • 上一篇    下一篇

规则中孔氧化铈的纳米铸型合成及作为高CO氧化活性金催化载体的应用

张慧丽, 阎晓洁, 李文翠   

  1. 大连理工大学化工学院精细化工国家重点实验室, 辽宁大连 116012
  • 收稿日期:2009-11-25 出版日期:2009-11-25 发布日期:2013-07-17

Nanocast Ordered Mesoporous CeO2 as Support for Highly Active Gold Cata-lyst in CO Oxidation

ZHANG Huili, YAN Xiaojie, LI Wencui*   

  1. State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116012, Liaoning, China
  • Received:2009-11-25 Online:2009-11-25 Published:2013-07-17

PDF

1023

被引次数

14

摘要： 以有序的中孔炭材料 CMK-3 为模板, 以硝酸铈为前体, 利用纳米铸型法合成了具有规则结构的中孔氧化铈, 考察了模板脱除温度对中孔氧化铈微结构的影响. 热重、元素分析、X 射线衍射、透射电镜和氮气物理吸附结果表明, 炭模板的脱除温度可低至 350 oC, 所得氧化铈具有二维六方规则结构, 比表面积高达 167 m2/g, 孔径分布集中在 3~5 nm. 采用胶体沉积法将 2~5 nm 的金溶胶粒子沉积到所得氧化铈表面制得了 Au/CeO2 催化剂, 考察了 Au/CeO2 在 CO 氧化反应中的活性. 结果表明, 该催化剂的活性较常规氧化铈制备的金催化剂有明显提高, 这可能与载体的规则结构有关.

关键词: 氧化铈, 炭模板, 纳米铸型, 金, 一氧化碳, 氧化

Abstract: Ordered mesoporous ceria oxides (CeO2) were synthesized by nanocasting using ordered mesoporous carbon (CMK-3) as the template and cerium nitrate as the CeO2 precursor. The as-prepared materials were characterized by thermogravimetry, elemental analysis, powder X-ray diffraction, transmission electron microscopy, and N2 adsorption. The obtained ceria exhibits a 2-D hexagonal ordered structure with a high surface area of up to 167 m2/g and pore size in the range of 3–5 nm. The carbon template can be completely removed at a temperature as low as 350 oC. Such ceria was then employed as the support for the preparation of gold catalysts by the colloid deposition method. The catalytic activity of the Au/CeO2 catalyst was evaluated in CO oxidation. An enhanced catalytic activity was observed over such a catalyst possibly due to the nano-sized particle and narrow pore size of the ordered mesoporous ceria.

Key words: ceria, carbon template, nanocasting, gold, carbon monoxide, oxidation