Effect of the preparation of supported gold particles on the catalytic activity in CO oxidation reaction

被引:56
作者
Dobrosz, I
Jiratova, K
Pitchon, V
Rynkowski, JM
机构
[1] CNRS, ECPM, Lab Mat Surfaces & Proc Catalyse, LMSPC,UMR 7515, F-67087 Strasbourg, France
[2] Acad Sci Czech Republic, Inst Chem Proc, CR-16502 Prague, Czech Republic
[3] Tech Univ Lodz, Inst Chem & Ecol Chem, PL-90924 Lodz, Poland
关键词
gold catalysts; CO oxidation; catalyst preparation; hydrotalcite;
D O I
10.1016/j.molcata.2005.02.032
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
Gold catalysts supported on hydrotalcite (HT) with a Mg:Al molar ratio 4:2 were prepared by direct anionic exchange (DAE) or by deposition-precipitation (DP) with NaOH or urea, in order to investigate the influence of the synthesis parameters on the catalytic conversion in CO oxidation. The highest activity was obtained for Au/Mg4Al2 prepared by DAE. The influence of various parameters on CO conversion such as the HAuCl4 concentration in the initial solution, the washing procedure, the pre-treatment temperature, the precursor of HT and the gold loadings were investigated. This study confirms the poisoning effect of chloride. The average gold particle size is higher for the catalysts with higher residual chloride content. In order to remove the remaining chloride from the sample, different washing procedures were used, i.e. either with warm water or with ammonia. Changes in activity and particle size were observed according to the washing procedure. Higher calcination temperature increases the surface area of HT contributing to better dispersion of gold. A smaller particle size, as measured by XRD and TEM, is obtained on HT prepared from sulfate precursor rather than nitrate. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:187 / 197
页数:11
相关论文
共 30 条
[11]   NOVEL GOLD CATALYSTS FOR THE OXIDATION OF CARBON-MONOXIDE AT A TEMPERATURE FAR BELOW 0-DEGREES-C [J].
HARUTA, M ;
KOBAYASHI, T ;
SANO, H ;
YAMADA, N .
CHEMISTRY LETTERS, 1987, (02) :405-408
[12]   Size- and support-dependency in the catalysis of gold [J].
Haruta, M .
CATALYSIS TODAY, 1997, 36 (01) :153-166
[13]   A new preparation method for the formation of gold nanoparticles on an oxide support [J].
Ivanova, S ;
Petit, C ;
Pitchon, V .
APPLIED CATALYSIS A-GENERAL, 2004, 267 (1-2) :191-201
[14]   Preparation and characterisation of activated Ni (Mn)/Mg/Al hydrotalcites for combustion catalysis [J].
Jirátová, K ;
Cuba, P ;
Kovanda, F ;
Hilaire, L ;
Pitchon, V .
CATALYSIS TODAY, 2002, 76 (01) :43-53
[15]   Characterization of activated Cu/Mg/Al hydrotalcites and their catalytic activity in toluene combustion [J].
Kovanda, F ;
Jirátová, K ;
Rymes, J ;
Kolousek, D .
APPLIED CLAY SCIENCE, 2001, 18 (1-2) :71-80
[16]   Catalysts for lean NOx reduction: structure-property relationship [J].
Kung, MC ;
Bethke, KA ;
Yan, J ;
Lee, JH ;
Kung, HH .
APPLIED SURFACE SCIENCE, 1997, 121 :261-266
[17]   Supported Au catalysts for low-temperature CO oxidation prepared by impregnation [J].
Lee, SJ ;
Gavriilidis, A .
JOURNAL OF CATALYSIS, 2002, 206 (02) :305-313
[18]   LOW-TEMPERATURE CO OXIDATION OVER AU/TIO2 AND AU/SIO2 CATALYSTS [J].
LIN, SD ;
BOLLINGER, M ;
VANNICE, MA .
CATALYSIS LETTERS, 1993, 17 (3-4) :245-262
[19]   Au/MgO catalysts modified with ascorbic acid for low temperature CO oxidation [J].
Margitfalvi, JL ;
Fási, A ;
Hegedus, M ;
Lónyi, F ;
Gobölös, S ;
Bogdanchikova, N .
CATALYSIS TODAY, 2002, 72 (1-2) :157-169
[20]   Hydrotalcite-supported palladium catalysts Part I: Preparation, characterization of hydrotalcites and palladium on uncalcined hydrotalcites for CO chemisorption and phenol hydrogenation [J].
Narayanan, S ;
Krishna, K .
APPLIED CATALYSIS A-GENERAL, 1998, 174 (1-2) :221-229