催化学报 ›› 2008, Vol. 29 ›› Issue (5): 421-425.

• 研究论文 • 上一篇    下一篇

Pt/Al2O3涂层金属蜂窝催化剂的制备及其CO选择性氧化催化性能

张建国1,2,郏景省1,张纯希1,王树东1   

  1. 1 中国科学院大连化学物理研究所, 辽宁大连 116023; 2 中国科学院研究生院, 北京 100049
  • 收稿日期:2008-05-25 出版日期:2008-05-25 发布日期:2012-05-02

Preparation of Pt/Al2O3 Metallic Honeycomb Catalyst and Its Catalytic Properties for CO Preferential Oxidation

ZHANG Jianguo1,2, JIA Jingsheng1, ZHANG Chunxi1, WANG Shudong\{1*\}   

  1. 1 Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian 116023, Liaoning, China; 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2008-05-25 Online:2008-05-25 Published:2012-05-02

摘要: 将孔密度为400 cells/in2的Fe-20Cr-5Al金属蜂窝基体经过高温氧化后,负载Al2O3涂层,再浸渍贵金属铂,制备出用于CO选择性氧化的Pt/Al2O3涂层金属蜂窝催化剂. 金属蜂窝基体经过900 ℃高温氧化10 h后,表面呈现钉针状结构,这种结构可以提高基体与Al2O3涂层的相容性. 最佳的Al2O3涂层负载顺序为乳胶-溶胶-乳胶. 在120 ℃时, Pt/Al2O3涂层金属蜂窝催化剂的CO选择性氧化反应活性和选择性分别为54.0%和42.5%, 为相同条件下陶瓷蜂窝催化剂的1.7和1.4倍.

关键词: 金属蜂窝催化剂, 高温氧化, 一氧化碳, 选择性氧化

Abstract: A Pt/Al2O3 metallic honeycomb catalyst was prepared and studied in the CO preferential oxidation. The surface of the Fe-20Cr-5Al metallic substrate (400 cells/in2) appeared needle shape structure when it was oxided at 900 ℃ for 10 h. The optimal Al2O3 coating procedure was slurry-sol-slurry. The metallic honeycomb catalyst showed CO conversion of 54.0% and CO selectivity of 42.5% in CO preferential oxidation at 120 ℃, which were 1.7 and 1.4 times that of the ceramic honeycomb catalyst, respectively.

Key words: metallic honeycomb catalyst, high-temperature oxidation, carbon monoxide, preferential oxidation