Au/MnO2-TiO2 catalyst for preferential oxidation of carbon monoxide in hydrogen stream

被引:43
作者
Chang, Li-Hsin [1 ]
Sasirekha, Natarajan [1 ]
Chen, Yu-Wen [1 ]
机构
[1] Natl Cent Univ, Nanocatalysis Res Ctr, Dept Chem Engn, Chungli 320, Taiwan
关键词
D O I
10.1016/j.catcom.2006.08.050
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The catalytic activity of nanosize gold catalysts supported on MnO2-TiO2 and prepared by deposition-precipitation method has been investigated for preferential oxidation of carbon monoxide in H-2 stream. The catalysts were characterized by inductively coupled plasmaatomic emission spectroscopy, X-ray diffraction, nitrogen sorption, transmission electron microscopy, and X-ray photoelectron spectroscopy. The influence of pH in the preparation process and the amount of MnO2 loading on the catalytic properties of the Au/MnO2-TiO2 catalysts were also studied. Fine dispersion of gold nanoparticles on all the supports was obtained. Especially, Au/MnO2-TiO2 with Mn02/TiO2 mol ratio of 2:98, showed a mean An particle size of 2.37 nm. The nanosized support constrained the size of gold. The addition of MnO2 on Au/TiO2 catalyst improved the selectivity of CO oxidation without sacrificing CO conversion in hydrogen stream between 50 and 100 degrees C. This could be attributed to the interactions of gold metal with MnO2-TiO2 support and the optimum combination of metallic and electron-deficient gold on the catalyst surface. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:1702 / 1710
页数:9
相关论文
共 46 条
[1]   The influence of the preparation methods on the catalytic activity of platinum and gold supported on TiO2 for CO oxidation [J].
Bamwenda, GR ;
Tsubota, S ;
Nakamura, T ;
Haruta, M .
CATALYSIS LETTERS, 1997, 44 (1-2) :83-87
[2]   FTIR study of CO oxidation on Au/TiO2 at 90 K and room temperature.: An insight into the nature of the reaction centers [J].
Boccuzzi, F ;
Chiorino, A .
JOURNAL OF PHYSICAL CHEMISTRY B, 2000, 104 (23) :5414-5416
[3]   Catalysis by gold [J].
Bond, GC ;
Thompson, DT .
CATALYSIS REVIEWS-SCIENCE AND ENGINEERING, 1999, 41 (3-4) :319-388
[4]   Preferential oxidation of CO in H2 stream over Au/MnO2-CeO2 catalysts [J].
Chang, Li-Hsin ;
Sasirekha, Natarajan ;
Chen, Yu-Wen ;
Wang, Wei-Jye .
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 2006, 45 (14) :4927-4935
[5]   Novel oxygen storage components for advanced catalysts for emission control in natural gas fueled vehicles [J].
Chang, YF ;
McCarty, JG .
CATALYSIS TODAY, 1996, 30 (1-3) :163-170
[6]   On the potential role of hydroxyl groups in CO oxidation over Au/Al2O3 [J].
Costello, CK ;
Yang, JH ;
Law, HY ;
Wang, Y ;
Lin, JN ;
Marks, LD ;
Kung, MC ;
Kung, HH .
APPLIED CATALYSIS A-GENERAL, 2003, 243 (01) :15-24
[7]   Performance of Au/TiO2 catalyst under ambient conditions [J].
Daté, M ;
Ichihashi, Y ;
Yamashita, T ;
Chiorino, A ;
Boccuzzi, F ;
Haruta, A .
CATALYSIS TODAY, 2002, 72 (1-2) :89-94
[8]   CO adsorption and oxidation on Au/TiO2 [J].
Dekkers, MAP ;
Lippits, MJ ;
Nieuwenhuys, BE .
CATALYSIS LETTERS, 1998, 56 (04) :195-197
[9]   Surface characterization study of Au/alpha-Fe2O3 and Au/Co3O4 low-temperature CO oxidation catalysts [J].
Epling, WS ;
Hoflund, GB ;
Weaver, JF ;
Tsubota, S ;
Haruta, M .
JOURNAL OF PHYSICAL CHEMISTRY, 1996, 100 (23) :9929-9934
[10]   A highly active catalyst for CO oxidation at 298 K:: mononuclear AuIII complexes anchored to La2O3 nanoparticles [J].
Fierro-Gonzalez, JC ;
Bhirud, VA ;
Gates, BC .
CHEMICAL COMMUNICATIONS, 2005, (42) :5275-5277