摘要
以V2O5为催化剂,在发烟硫酸中进行了甲烷液相选择性氧化的研究工作,考察了V2O5催化剂用量、反应温度、反应时间、发烟硫酸浓度等工艺条件对反应收率的影响,进行了甲烷液相选择性氧化的催化机理探讨和宏观动力学推导。甲烷在部分氧化反应中首先转化为硫酸甲酯,后者进一步水解得到甲醇。甲烷转化率可达54.5%,选择性45.5%,相应的工艺条件为催化剂用量0.0175mol、反应温度180℃、发烟硫酸中SO3含量50%(wt)、反应时间2h。V2O5催化甲烷液相部分氧化反应遵循亲代取代机理,甲烷液相部分氧化反应为一级反应。
The partial oxidation of methane catalyzed by V2O5 in oleum was studied. The effects of concentration of V2O5, reaction temperature, residence time and concentration of oleum on the conversion of methane and the yield of methanol were investigated. The mechanism of V2O5 catalytic cycle for methane partial oxidation in oleum was discussed and the macro-kinetic model was deduced. It is found that the methane is transformed firstly into methyl bisulfate and the methyl bisulfate is then hydrolyzed to form the methanol. The maximum methanol yield of 45.5% and the methane conversion of 54.5% can be obtained when the content of sulfur trioxide in oleum is about 50% and the concentration of V2O5 0.0175 mol, reaction temperature 180℃, pressure of methan 4.0 MPa and reaction time 2 h are used. The macro-kinetic model shows that the process of methane partial oxidation catalyzed by V2O5 follows the electrophilic alternative mechanisms and the methane oxidation reaction is a first-order reaction.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2006年第3期417-421,共5页
Journal of Chemical Engineering of Chinese Universities
基金
陕西省教育厅专项基金(01JK097)。
