高效甲烷转化技术一直是学术界及工业界的研究热点，其中，甲烷转化制甲醇颇受业界关注。然而，甲烷分子结构稳定且C—H键能大（413 kJ/mol）导致转化困难。采用新型介质阻挡放电反应器，以循环水为接地极，在低温常压条件下通过分子氧实现甲烷直接氧化制甲醇。结果表明，在短停留时间和低功率条件下可以达到较高的甲醇选择性，在温度为85℃、n（CH₄）：n（O₂）为2：1、停留时间为0.393 s和功率为30 W条件下，甲烷转化率达到4.1%，甲醇选择性达到42.2%，液体产物选择性达到76.2%。

The development of efficient methane conversion technologies,especially methane to methanol,has been intensively studied worldwide.Due to methane's stable molecular structure and strong C—H bond energy (413 kJ/mol),selective activation and direct conversion of methane have been regarded as Holy Grail in catalysis.In this study,a novel dielectric barrier reactor (DBD) with circulating water as the grounding electrode is proposed to oxidize methane to methanol by molecular oxygen.It is found in the study that high selectivity of methanol can be realized under short residence time and low power condition.The conversion of methane,the selectivity of methanol and the selectivity of liquid products can reach 4.1%,42.2% and 76.2% when the temperature remains at 85℃,n(CH₄):n(O₂)=2:1,residence time is 0.393 s and the power is 30 W.

李尚昆(1994-),男,硕士研究生,研究方向为等离子体催化,lishangkun@mail.dlut.edu.cn