The reporter learned from the Institute of Metal Research of the Chinese Academy of Sciences yesterday that the research institute of the Institute of Catalytic Materials of the National Materials Laboratory of the Shenyang Materials Science Institute, with the highly curved oxygen-doped graphene active structure on the surface of nanodiamonds, is anaerobic, Under the condition of low temperature steam protection, the direct dehydrogenation of ethylbenzene to styrene is achieved, and its catalytic activity is about three times that of industrial iron oxide catalyst.
This achievement will have a good application prospect in the field of ethylbenzene dehydrogenation. For the first time, researchers have used non-metallic materials to catalyze direct dehydrogenation reactions, using advanced in-situ characterization methods to achieve important breakthroughs in key scientific issues such as non-metallic catalytic reaction mechanisms, active sites and reactive intermediates. The in-depth development and technical upgrading of the traditional industry of ethylbenzene dehydrogenation provide an important reference.
According to reports, carbon deposition has been a key issue that has plagued the alkane conversion industry. Conventional catalysts use metals and their oxides as active components, and the reactant alkane molecules inevitably form carbon deposits while being activated, eventually leading to loss of catalyst activity. The traditional solution is to add alkali metal, rare earth metal oxide and other additives to delay the deactivation process, or introduce a large amount of water vapor for carbon in situ to protect the active center. It is urgent to develop a new generation of energy-saving, clean and efficient alkane removal. Hydrogen catalytic material.
The Department of Catalytic Materials of the National Materials Laboratory of Shenyang Materials Science and the Fritz Haber Institute of Germany, the Changchun Institute of Applied Chemistry of the Chinese Academy of Sciences, and the Croatian researchers found that the carbon atoms on the surface of nanodiamonds are partially graphitized under the action of large surface curvature. A unique "diamond-graphene" core-shell nanostructure is formed. They investigated the activity and stability of nanodiamonds and typical industrial iron oxide catalysts under the direct dehydrogenation conditions of anhydrous vapor protection. The results showed that after 5 hours from the start of the reaction, the conversion on the iron oxide catalyst was rapidly reduced from 20.2% to 7.1%, while the conversion on the nanodiamond was higher than 20.5% in 120 hours, and the styrene selectivity was as high as 97.3%. After the reaction, severe carbon deposition occurred on the iron oxide, and the surface structure of the nanodiamond did not change significantly.
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