Partial oxidation of propane over metal oxide catalysts pretreated with NO2

被引:10
作者
Ueda, A
Ejima, K
Azuma, M
Kobayashi, T
机构
[1] Osaka Natl Res Inst, AIST, Ikeda, Osaka 563577, Japan
[2] Osaka Inst Technol, Dept Appl Chem, Asashi Ku, Osaka 5350002, Japan
关键词
nitrogen dioxide; titania; propene; selective oxidation; adsorption;
D O I
10.1023/A:1019010023365
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
Titania pretreated with NO2 has been found to catalyze the partial oxidation of propene into oxygenates such as acetone and acrolein at around 623 K, while fresh TiO2 produces only carbon oxides. Temperature-programmed desorption (TPD) revealed that nitrogen oxides adsorbed on TiO2 are stable at temperatures below 673 K. Even after the propene oxidation at 573 K for 2 h, nitrogen oxides were confirmed still to exist on the TiO2 surface. At temperatures higher than 673 K, however, the desorption and/or the reduction of the adsorbed nitrogen oxides took place, and concomitantly the catalytic ability giving oxygenates disappeared.
引用
收藏
页码:73 / 76
页数:4
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