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    Home > Coatings News > Paints and Coatings Market > Methane oxidation coupled olefins enable low temperature catalysis

    Methane oxidation coupled olefins enable low temperature catalysis

    • Last Update: 2021-01-02
    • Source: Internet
    • Author: User
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    China Coatings Online News News
    Professor Lu Yong of Shanghai Green Chemistry and Chemical Process Greening Key Laboratory of East China Normal University has made important progress in the study of low-temperature methane oxidation coupled olefins, and the results of "TiO2 doping Mn2O3-Na2WO4/SiO2 catalyst MnTiO3 drive low temperature methane oxidation coupled olefins" was published recently in Science Advances. Ph.D. students Wang Pengwei and Zhao Guofeng are co-authors of the paper, Professor Lu Yong and Zhao Guofeng are co-authors of the paper, and East China Normal University is an independent completion unit for the work.ethylene and other low-carbon olefins are important basic chemical raw materials, widely used in the production of plastics, fibers and rubber and other chemical products, its output is an important indicator to measure the rise and fall of a country's petrochemical industry. For a long time, its production mainly depends on the cracking of python oil vapor; However, the resources of pneumothyl oil derived from petroleum processing routes are becoming increasingly scarce, so it is a strategic subject of great academic significance and great application value to open up and develop new routes for the synthesis of low-carbon olefins from non-oil resources such as methane (the main components of natural gas, shale gas and coal seam gas), coal and biomass.Inspired by research reports such as "Methane cryogenic electrochemical oxidation methanol", luyong task force put forward a new idea of "low temperature chemical cycle active O2 molecules to drive low temperature OCM reaction", and objectively selected TiO2 additives that can form compounds with MnxOy at low temperatures. Mn2O3-Na2WO4/SiO2 was modified to significantly reduce the reaction temperature from 800 degrees C to 650 degrees C, and still obtained more than 20% methane conversion rate and more than 60% product selectivity.the essence of this study lies in the formation of the cryogenic chemical cycle "MnTiO3↔Mn2O3", i.e. the introduction of TiO2 "low temperature catalytic" Mn2O3 oxidation of CH4 molecules to generate MnTiO3, the resulting MnTiO3 can be at lower temperatures and O2 molecular reactions into Mn2O3 and TiO2., the cryogenic chemical cycle and Na2WO4 have a co-catalytic effect, achieving the high selective regulation of the target product. The judgment of the catalyst lattic oxygen conversion rate threshold is also proposed, that is, no matter what the reaction temperature, as long as the catalyst lattic oxygen conversion rate can reach the threshold and above, the catalyst has good catalytic properties. In addition, the catalyst is stable and operates steadily for 500 hours at 720 degrees C with no signs of incasion. This research result provides a new way for the direct biogas transformation of methane, and also provides a new way for the high-value chemical utilization of shale gas and coal seam gas resources in China.
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