摘要
通过分子束与表面散射实验确定甲烷在La2O3清洁表面是平动能激活吸附,阈值平动能53.48kJ/mol.氧在La2O3清洁表面的吸附服从Arrhenius方程关系,其脱附峰在960K。甲烷只在吸咐氧的La2O3表面发生催化氧化反应,催化剂样品温度在800K以后反应产物CO2出现,但其关键因素还是CH4分子的平动能。在阈值平动能以下,样品温度超过850K也无反应产物出现。
The methane molecular beam scattering experiments of La2O3 surface have been made. The adsorption of methane on the clean surface of La2O3 is the translational energy activation adsorption ,its threshold value is 53. 58 kJ/mol. The adsorption of oxygen on the clean surface of La2O3 is suited to the Arrhenius equation ,the desorption peak of oxygen is on 960K. The La2O3 surface coated oxygen can catalyze the oxidative reaction of methane ,its reaction product co_2 appeared above 800K. The key factor of this reaction is the translational energy of methane molecule. No product can be seen below the threshold value of thetranslational energy even though higher than 850K.
出处
《南开大学学报(自然科学版)》
CAS
CSCD
1995年第2期72-76,96,共6页
Acta Scientiarum Naturalium Universitatis Nankaiensis
基金
天津大学内燃机燃烧学国家重点实验室科学基金
关键词
分子束
甲烷
催化氧化反应
稀土氧化物
催化剂
molecular beam technigues
translational energy
sticking probability
catalysis