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The First Use Of MXene Material As A Catalyst For The Dehydrogenation Of Alkanes

wallpapers Industry 2020-06-02

As a critical organic monomer raw material, olefin is closely related to the daily production and life of human beings. For example, ethylene, propylene, and styrene are widely used in the synthesis of various engineering plastics, rubber, and resins. Industrially, styrene is mainly produced by dehydrogenation of ethylbenzene catalyzed by potassium-promoted iron oxide catalyst under the protection of excessive superheated steam. This traditional production method consumes a lot of energy and water resources, which is not conducive to the development of a green economy. Therefore, exploring and developing new catalytic materials and reducing reaction energy consumption have always been the focus of research in the field of industrial dehydrogenation.

As a new type of transition metal carbide two-dimensional crystal, MXene has a structure similar to graphene. It can be obtained by etching the MAX phase of the layered ceramic material with hydrofluoric acid. It has excellent mechanical, electronic, and magnetic properties. It is widely used in the fields of electrochemical energy storage, composite material reinforcement, lubrication, electromagnetic shielding and other areas.

The Ti3C2TxMXene material was used in the reaction of ethylbenzene dehydrogenation to styrene. It was found that the MXene material per unit specific surface area had an ethylbenzene dehydrogenation activity of 92 μmol m-2 h-1 and a styrene selectivity of 97.5%, which was much higher. It is a highly active non-metal dehydrogenation catalyst known at present and exhibits excellent high-temperature stability. Through various characterization methods and first-principles calculations, it is found that the reaction uses the C-Ti-O functional group generated during the etching process as the dehydrogenation active site. Which, in turn, removes the two hydrogen atoms on the ethyl group in the ethylbenzene molecule. Styrene is obtained. At the same time, the layered structure of MXene material is also conducive to heat and mass transfer during the reaction process, so that the catalyst has higher specific activity and stability.

This work is the first use of MXene material as a catalyst for the dehydrogenation of alkanes, and successfully revealed the active site and reaction path of the incentive to catalyze the dehydrogenation of alkanes, thereby providing new options for the development of industrial alkane dehydrogenation catalysts.

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