催化学报

催化学报 ›› 2009, Vol. 30 ›› Issue (11): 1114-1118.

• 研究论文 • 上一篇    下一篇

Birnessite和Cryptomelane型氧化锰的可控合成及其催化性能

刁贵强, 余林, 孙明, 余倩, 范方强, 那秀辉   

  1. 广东工业大学轻工化工学院, 广东广州 510006
  • 收稿日期:2009-11-25 出版日期:2009-11-25 发布日期:2013-07-17

Controllable Synthesis of Birnessite and Cryptomelane Types of Manganese Oxide and Their Catalytic Performance

DIAO Guiqiang, YU Lin*, SUN Ming, YU Qian, FAN Fangqiang, NA Xiuhui   

  1. Faculty of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, Guangdong, China
  • Received:2009-11-25 Online:2009-11-25 Published:2013-07-17

PDF

1253

被引次数

22

摘要： 以葡萄糖和高锰酸钾为原料, 采用溶胶-凝胶法合成了 birnessite (K1.35MnO2, 简写为 Bir) 和 cryptomelane (K0.27MnO2, 简写为 Cry) 型氧化锰; 采用 X 射线衍射、原子吸收光谱等考察了凝胶处理方法、反应物浓度比、焙烧温度和反应时间等对氧化锰晶型的影响. 结果表明, 采用不同方法处理凝胶可实现对 Bir 和 Cry 型氧化锰的可控合成. 以不同的处理方法, 葡萄糖和高锰酸钾的浓度比为 0.74, 反应 20 s 制成凝胶, 并在 400 oC 焙烧 2 h, 可分别制取高结晶度和高纯度的 Bir 和 Cry 型氧化锰. Bir 和 Cry 型氧化锰在二甲醚燃烧反应中表现出优异的催化性能, 且 Cry 型氧化锰的催化活性更高.

关键词: 溶胶-凝胶法, 氧化锰, 可控合成, 二甲醚, 催化燃烧

Abstract: The birnessite and cryptomelane types of manganese oxide were prepared by the sol-gel method using KMnO4 and glucose. The optimum conditions were investigated by varying different process variables such as c(glucose)/c(KMnO4) ratio, calcination temperature, reaction time, and gel treatment methods. The results of X-ray diffraction and atomic absorption spectroscopy indicated that the crystal phases of manganese oxide were controllable with different gel treatment methods. Under the conditions of c(glucose)/c(KMnO4) = 0.74, t = 20 s and by different gel treatment methods, the birnessite and cryptomelane with high purity and high crystallinity were synthesized. The catalytic performance of both types of manganese oxide for the combustion of dimethyl ether was excellent, but the cryptomelane showed much higher catalytic activity than the birnessite.

Key words: sol-gel method, manganese oxide, controllable synthesis, dimethyl ether, catalytic combustion