摘要
制备了 V2 O5 、 Mo O3和 V2 O5 · Mo O3复合氧化物催化剂 ,并进行了 IR表征 ;对催化剂表面乙烷的吸附性能进行了 IR和 TPD表征 .用激光促进表面反应 (L SSR)技术 ,考察了乙烷氧化脱氢生成乙烯的反应规律 .结果表明 ,氧化物表面的 V =O和 Mo=O键是乙烷主要的吸附位 . V2 O5 与 Mo O3的相互作用 ,减弱了 Mo=O键的吸附能力 .在不同的激光激发频率下 ,L SSR反应遵循吸附态激发机理或固体表面键激发机理 .温度对 L
The oxides V 2O 5, MoO 3 and the complex compound V 2O 5·MoO 3 were prepared, and their surface structures were studied using IR method. The chemisorption properties of ethane on these compounds were investigated with IR and TPD. The reaction of ethane oxidative dehydrogenation to ethylene was studied using the method of laser stimulated surface reaction (LSSR). The experimental results show that the main ethane adsorption sites on the surfaces of the catalysts are Mo=O and V=O bonds. In complex compound V 2O 5· MoO 3 , the interaction of V 2O 5 with MoO 3 can retard the adsorption ability of Mo=O bond. LSSR reaction follows the surface bond excitation model or the adsorbed molecular excitation model according to the different exciting frequencies of laser. Increase of temperature can help the conversion of ethane without decreasing the selectivity of C 2H 4.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2000年第2期119-124,共6页
Journal of Molecular Catalysis(China)
关键词
乙烷
氧化脱氢反应
钼
钒
金属氧化物
Ethane
Ethylene
Oxidative dehydrogenation
Laser stimulated surface reaction
Mental oxides
