Roles of surface and bulk lattice oxygen in forming CO2 and CO during methane reaction over gadolinia-doped ceria

被引：28

作者：

Huang, Ta-Jen ^{[1
]}

Wang, Chun-Hsiu ^{[1
]}

机构：

[1] Natl Tsing Hua Univ, Dept Chem Engn, Hsinchu 300, Taiwan

来源：

CATALYSIS LETTERS | 2007年 / 118卷 / 1-2期

关键词：

methane reaction; carbon dioxide; carbon monoxide; gadolinia-doped ceria; lattice oxygen;

D O I：

10.1007/s10562-007-9158-x

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：

Temperature-programmed reaction of methane and temperature-programmed reduction were performed over gadolinia-doped ceria (GDC). It was found that CO2 formation can occur at very much lower temperature than CO formation. The surface lattice oxygen acts as the active site for CH4 adsorption. This active site has a dynamic characteristic due to the mobility of the lattice oxygen. The rates of CO and CO2 formations can be controlled by the supply rate of the lattice oxygen from the GDC bulk; this supply rate depends on the mobility and the concentration of the bulk lattice oxygen. CO2 formation is associated with the existing surface lattice oxygen while CO formation depends on the oxygen species coming from the bulk lattice during methane reaction.

引用

页码：103 / 108

页数：6

共 22 条

[1] Contributions of lattice oxygen to the overall oxygen balance during methane combustion over PdO-based catalysts [J].

Ciuparu, D ;

Pfefferle, L .

CATALYSIS TODAY, 2002, 77 (03) :167-179

[2] COMPUTER MODELING OF SURFACES AND DEFECTS ON CERIUM DIOXIDE [J].

CONESA, JC .

SURFACE SCIENCE, 1995, 339 (03) :337-352

[3] Methane decomposition and self de-coking over gadolinia-doped ceria-supported Ni catalysts [J].

Huang, Ta-Jen ;

Wang, Chun-Hsiu .

CHEMICAL ENGINEERING JOURNAL, 2007, 132 (1-3) :97-103

[4] Factors in forming CO andCO2 over a cermet of Ni-gadolinia-doped ceria with relation to direct methane SOFCs [J].

Huang, Ta-Jen ;

Wang, Chun-Hsiu .

JOURNAL OF POWER SOURCES, 2006, 163 (01) :309-315

[5] A comparison of oxygen-vacancy effect on activity behaviors of carbon dioxide and steam reforming of methane over supported nickel catalysts [J].

Huang, TJ ;

Lin, HJ ;

Yu, TC .

CATALYSIS LETTERS, 2005, 105 (3-4) :239-247

[6] Effect of steam and carbon dioxide pretreatments on methane decomposition and carbon gasification over doped-ceria supported nickel catalyst [J].

Huang, TJ ;

Yu, TC .

CATALYSIS LETTERS, 2005, 102 (3-4) :175-181

[7] Effect of support modification on reduction and CO oxidation activity of doped ceria-supported copper oxide catalyst [J].

Huang, TJ ;

Kung, YC .

CATALYSIS LETTERS, 2003, 85 (1-2) :49-55

[8]

HUANG TJ, 2007, CHEM ENG J

[9] Catalytic dry reforming of methane over high surface area ceria [J].

Laosiripojana, N ;

Assabumrungrat, S .

APPLIED CATALYSIS B-ENVIRONMENTAL, 2005, 60 (1-2) :107-116

[10] Direct operation of solid oxide fuel cells with methane fuel [J].

Lin, YB ;

Zhan, ZL ;

Liu, J ;

Barnett, SA .

SOLID STATE IONICS, 2005, 176 (23-24) :1827-1835

← 1 2 3 →