CO oxidation on Cu/MgO-SiO2 sol-gel derived catalysts

被引：11

作者：

Manriquez, ME ^{[1
]}

Lopez, T ^{[1
]}

Gomez, R ^{[1
]}

机构：

[1] Univ Autonoma Metropolitana Iztapalapa, Dept Chem, Mexico City 09340, DF, Mexico

来源：

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY | 2003年 / 26卷 / 1-3期

关键词：

Cu-MgOSiO2; catalysts; CO oxidation; Si-29; MAS-NMR; sol-gel catalysts; CO2-TPD; NH3-TPD;

D O I：

10.1023/A:1020759902274

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Sol-gel Cu//MgOSiO2 catalysts were prepared gelling tetraethoxysilane (TEOS), magnesium ethoxide and copper acetylacetonate at pH 3 and pH 9. The catalysts shown specific surface areas ca. 500 m(2)/g and 140 m(2)/g for pH 9 and pH 3 preparations respectively. Si(OH) and Si(OH)(2) hydroxy groups were observed by MAS-RMN spectroscopy in both preparations. CO2-TPD and NH3-TPD desorption thermograms showed that acid and basic sites were formed on the catalysts surface. It has been found that the catalysts having the highest density of basic sites were the catalysts showing the highest activity for the CO oxidation. It is proposed that the catalytic activity depends of the relative Cu-=1/Cu-=2 stability given by the support acidity.

引用

页码：853 / 857

页数：5

共 17 条

[1] Catalytic reduction of nitric oxide on Pt and Rh catalysts supported on alumina and titania synthesized by the sol-gel method [J].

Castillo, S ;

Moran-Pineda, M ;

Molina, V ;

Gomez, R ;

Lopez, T .

APPLIED CATALYSIS B-ENVIRONMENTAL, 1998, 15 (3-4) :203-209

[2] Nonselective reduction of NO by CO under oxidizing conditions on supported rhodium sol-gel catalysts [J].

Castillo, S ;

MoranPineda, M ;

Gomez, R ;

Lopez, T .

JOURNAL OF CATALYSIS, 1997, 172 (01) :263-266

[3] CO OXIDATION OVER PD AND CU CATALYSTS .3. REDUCED AL2O3-SUPPORTED PD [J].

CHOI, KI ;

VANNICE, MA .

JOURNAL OF CATALYSIS, 1991, 131 (01) :1-21

[4] CO OXIDATION OVER PD AND CU CATALYSTS .5. AL2O3-SUPPORTED BIMETALLIC PD-CU PARTICLES [J].

CHOI, KI ;

VANNICE, MA .

JOURNAL OF CATALYSIS, 1991, 131 (01) :36-50

[5] Catalytic converters: state of the art and perspectives [J].

Farrauto, RJ ;

Heck, RM .

CATALYSIS TODAY, 1999, 51 (3-4) :351-360

[6] The current state of research on automotive lean NOx catalysis [J].

Fritz, A ;

Pitchon, V .

APPLIED CATALYSIS B-ENVIRONMENTAL, 1997, 13 (01) :1-25

[7] Carbon Monoxide Oxidation on Pt/TiO2 Sol-Gel Catalysts [J].

Gomez, R. ;

Lopez, T. ;

Castillo, S. ;

Gonzalez, R. D. .

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, 1994, 1 (02) :205-211

[8] Kinetics of the CO+NO reaction over rhodium and platinum-rhodium on alumina - II. Effect of Rh incorporation to Pt [J].

Granger, P ;

Lecomte, JJ ;

Dathy, C ;

Leclercq, L ;

Leclercq, G .

JOURNAL OF CATALYSIS, 1998, 175 (02) :194-203

[9]

Hamada H., 1997, CATAL SURV JPN, V1, P53

[10] EFFECTS OF ALTERVALENT CATION DOPING OF TIO2, ON KINETIC-PARAMETERS OF CO HYDROGENATION AND CO OXIDATION ON SUPPORTED RH [J].

IOANNIDES, T ;

VERYKIOS, XE ;

TSAPATSIS, M ;

ECONOMOU, C .

JOURNAL OF CATALYSIS, 1994, 145 (02) :491-500

← 1 2 →