PREPARATION AND SURFACE-COMPOSITION OF TUNGSTEN CARBIDE POWDERS WITH HIGH SPECIFIC SURFACE-AREA

被引：89

作者：

RIBEIRO, FH ^{[1
]}

BETTA, RAD ^{[1
]}

GUSKEY, GJ ^{[1
]}

BOUDART, M ^{[1
]}

机构：

[1] STANFORD UNIV,DEPT CHEM ENGN,STANFORD,CA 94305

来源：

CHEMISTRY OF MATERIALS | 1991年 / 3卷 / 05期

关键词：

D O I：

10.1021/cm00017a015

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：

Unsupported tungsten carbide powders of beta-W2C and WC have been prepared with specific surface area of 100 and 30 m2 g-1, respectively. WC surfaces are equilibrated with a stoichiometric carbide, lack carbon-carbon bonded surface residues, and contain less than 10% of a monolayer of residual oxygen. Beta-W2C and WC surfaces chemisorbed CO and H irreversibly with an uptake of 20 and 40% of a monolayer, respectively. Carbide sites chemisorb oxygen and NH3 strongly: about half of the oxygen desorbed in a TPR as CO at 1150 K and NH3 desorbed in a TPD as N2 at 800 and 1200 K.

引用

页码：805 / 812

页数：8

共 28 条

[1] CHARACTERIZATION OF SURFACE CARBIDES OF TUNGSTEN [J].