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| 2023-10-09 09:31:44 | onclick： | Direct catalytic conversion of methane and oxygen at room temperature |
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Methane is widespread in nature and can be used directly as a fossil fuel or converted into a more valuable chemical by catalytic reactions.In general, methane catalytic conversion provides an important way for its high-value utilization.Recently, Deng Dehui, a researcher at Dalian Institute of Chemical Physics, Chinese Academy of Sciences, and Yu Liang, an associate researcher, made new progress in the study of methane catalytic conversion at room temperature.The team found that coordinated unsaturated double Mo sites in the two-dimensional MoS2-side sulphur vacancy limit could catalyze the highly selective conversion of methane and oxygen to C1 oxygen-containing products at room temperature.The results were published in Nature-Catalysis.
Schematic diagram of catalytic conversion of methane.Dalian chemical supply map
Methane direct catalytic conversion to high value-added chemicals is a world problem, known as the "holy grail" of the chemical field, mainly because of the low polarizability and high C-H bond energy of methane.Directly directed methane conversion at low temperatures and even room temperatures using cheap, green oxygen is a "dream reaction."However, it is extremely difficult for oxygen molecules to continuously form active oxygen species that can activate methane C-H bonds under mild conditions, making direct catalytic conversion of methane to oxygen at room temperature challenging.
In this work, the team simulated the bi-nuclear metal center of methane monooxygenase in nature to construct the coordinated unsaturated bi-Mo site of MoS2 side sulphur vacancy limit region.Compared with previous reports, the catalytic system can convert methane and oxygen directly into C1 oxygen products such as methanol at 25℃, with a maximum conversion rate of 4.2%.At the same time, the selectivity of C1 oxygen-containing products is greater than 99%, which effectively inhibits the production of CO2.
Then, the team combined time-resolved in situ characterization and theoretical calculation to find that the coordinated unsaturated double Mo sites in the MoS2-side sulphur vacancy domain can dissociate oxygen molecules directly at room temperature.
This study provides a new idea for the development of catalytic conversion between methane and oxygen at room temperature.
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