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Oxidative dehydrogenation of ethane with carbon dioxide to ethylene over Cr/SSZ-13 catalyst
Received date: 2021-09-13
Online published: 2021-12-16
The conversion of light alkanes into olefins with the same carbon number through dehydrogenation reaction is an important approach for high-value utilization of alkanes and diversification of olefin raw materials.Oxidative dehydrogenation of alkanes to olefins has been a hot issue due to its advantages such as no limit of reaction equilibrium,less carbon deposition and low reaction temperature.CRX/SSZ-13 series catalysts with different Cr loading were prepared by impregnation method.The physical properties of the catalysts were characterized by nitrogen physical adsorption,ammonia-temperature programmed desorption（NH3-TPD）,carbon dioxide-temperature programmed desorption（CO2-TPD）,hydrogen-temperature programmed reduction（H2-TPR）,ultraviolet-visible spectroscopy（UV-Vis） and high-angle circular dark-field scanning transmission electron microscope（HAADF-STEM） coupled energy spectrum analysis（EDX-Mapping）.The catalytic performance of the catalysts for oxidative dehydrogenation of ethane to ethylene was evaluated in a micro fixed bed reactor.Finally,the structure-activity relationship of Cr/SSZ-13 catalyst was established.It was found that Cr1.5/SSZ-13-10 catalyst[n（SiO2）/n（Al2O3）=10] contained rich Cr3+ species,and the coordination unsaturated Cr3+ was an excellent dehydrogenation active site,which was co-nducive to the dehydrogenation of ethane by carbon dioxide oxidation.Therefore,Cr1.5/SSZ-13-10 catalyst showed excellent catalytic performance at 650 ℃,the carbon dioxide conversion and ethane conversion reached 26.41% and 53.2%,respectively,and the ethylene yield was 38.83%.
Key words： Cr/SSZ-13; carbon dioxide; oxidative dehydrogenation; ethane; ethylene
Wei ZHOU , Haibin YU , Xinbin MA . Oxidative dehydrogenation of ethane with carbon dioxide to ethylene over Cr/SSZ-13 catalyst[J]. Inorganic Chemicals Industry, 2021 , 53(12) : 43 -48 . DOI: 10.19964/j.issn.1006-4990.2021-0557
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