燃料化学学报（中英文）2026，Vol.54Issue(5)：138-152,15.DOI:10.1016/S1872-5813(25)60623-2
Mn2O3-TiO2-Na2WO4/SiO2+SiC催化剂上微波催化高效甲烷氧化偶联反应
Robust microwave catalytic oxidative coupling of methane over Mn2O3-TiO2-Na2WO4/SiO2+SiC
摘要
Abstract
Oxidative coupling of methane(OCM)is an important way for the high-value utilization of methane(CH4),but there are still some problems such as insufficient conversion and selectivity under traditional thermal catalysis.Herein,a new Mn2O3-TiO2-Na2WO4/SiO2+SiC microwave catalyst was developed for the oxidative coupling of methane under microwave irradiation.The results indicate that the calcined Mn2O3-TiO2-Na2WO4/SiO2+SiC catalyst is superior to the uncalcined counterpart in performance and the microwave catalytic reaction mode(MCRM)is significantly advantageous to the conventional reaction mode(CRM)for the OCM.For OCM at 700 ℃ in MCRM,the conversion of CH4,the selectivity to C2-C3 hydrocarbons,and the yield of C2-C3 are 26.6％,76.5％and 20.4％,respectively,much superior to the values of 12.3％,61.9％and 7.5％in CRM under identical reaction conditions.That is,microwave irradiation can significantly enhance the yield of C2-C3 for OCM at a lower reaction temperature.The Mn2O3-TiO2-Na2WO4/SiO2+SiC catalyst shows favorable stability at 700 ℃ during the OCM reaction in MCRM for 20 h,with a methane conversion of above 25％and a selectivity of above 76％to C2-C3 hydrocarbons.Further study illustrates that the microwave irradiation can significantly reduce the apparent activation energy to 27.5 kJ/mol,compared with the value of 173 kJ/mol in the conventional mode,promote the free radical coupling and inhibit deep oxidation of OCM products.These results provide a new idea for the efficient conversion of CH4 at a low temperature and for the sustainable development of green chemical industry.关键词
微波催化/低温高效/Mn2O3-TiO2-Na2WO4/SiO2+SiC/甲烷氧化偶联Key words
microwave catalysis/low temperature and high efficiency/Mn2O3-Na2WO4/SiO2+SiC/oxidative coupling of methane分类
化学化工引用本文复制引用
孙瑞泽,李冉,周继承,徐文涛..Mn2O3-TiO2-Na2WO4/SiO2+SiC催化剂上微波催化高效甲烷氧化偶联反应[J].燃料化学学报（中英文）,2026,54(5):138-152,15.基金项目
Supported by the National Natural Science Foundation of China(22178295,21706225),Natural Science Foundation of Hunan Province(2025JJ50085)and Hunan Collaborative Innovation Center of New Chemical Technologies for Environmental Benignity and Efficient Resource Utilization. （22178295,21706225）
