以H5PV2Mo10O40 为催化剂,在发烟硫酸中进行了甲烷液相部分氧化,考察了催化剂用量、反应温度、反应时间和发烟硫酸浓度等工艺条件对反应收率的影响. 甲烷在反应中首先转化为硫酸甲酯,硫酸甲酯随后水解为甲醇. 对于甲烷液相部分氧化反应,发烟硫酸中游离的SO3是非常重要的影响因素. 在工艺条件为催化剂用量7.0 mmol, 反应温度473 K, 反应压力3.5 MPa, 反应时间3 h和发烟硫酸中SO3含量50%时,甲烷转化率可达48.5%, 目的产物甲醇收率为41.5%.
The partial oxidation of methane by the H5PV2Mo10O40 catalyst in oleum was studied. The effects of catalyst amount, reaction temperature, reaction time, and sulfur trioxide concentration on the methane conversion and methanol yield were investigated. Methane was transformed to methyl bisulfate first, and then methyl bisulfate was hydrolyzed to methanol. Sulfur trioxide in oleum was necessary for the reaction system. The maximum methane conversion of 48.5% and methanol yield of 41.5% were obtained under the conditions of 7.0 mmol catalyst, methane pressure of 3.5 MPa, reaction temperature of 473 K, reaction time of 3 h, and 50% sulfur trioxide concentration.
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