Ethylbenzene Dehydrogenation to Styrene Upgrade
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This achievement will have a good application prospect in the ethylbenzene dehydrogenation industry. For the first time, researchers have used non-metal materials to catalyze direct dehydrogenation reactions. Advanced in-situ characterization techniques have made important breakthroughs in non-metallic catalytic reaction mechanisms, active-site structures, and reaction intermediates, and other key scientific issues for non-metallic catalysts. The in-depth development and technical upgrading of ethylbenzene dehydrogenation in traditional industries provide important references.
According to reports, carbon deposition has been a key issue for the alkane conversion industry. Traditional catalysts use metals and their oxides as active components. Alkane molecules of the reactants inevitably form carbon deposits at the same time, which ultimately results in loss of catalyst activity. The traditional solution is to add additives such as alkali metals and rare earth oxides to delay the deactivation process properly, or to introduce a large amount of water vapor to perform in-situ carbon removal to protect the active center. There is an urgent need to develop a new generation of energy-efficient, clean and highly efficient paraffin removal. Hydrogen catalytic material.
In cooperation with the Fritz Haber Institute of Germany, Changchun Institute of Chemistry of the Chinese Academy of Sciences and the Croatian researchers, the Department of Catalytic Materials of the State (Joint) Laboratory of Materials Science in Shenyang discovered that the carbon atoms on the surface of nanodiamonds undergo partial graphitization under the action of large surface curvature. A unique "diamond-graphene" core-shell nanostructure was formed. They examined the activity and stability of nanodiamonds and typical industrial iron oxide catalysts under the direct dehydrogenation reaction conditions without water vapor protection. The results showed that after 5 hours from the start of the reaction, the conversion rate on the iron oxide catalyst rapidly decreased from 20.2% to 7.1%, while the conversion rate on the nanodiamond was higher than 20.5% in 120 hours and the styrene selectivity was as high as 97.3%. After the reaction, serious carbon deposition occurred on the iron oxide, but the surface structure of the nano diamond did not change significantly.