Inorganic Chemicals Industry ›› 2021, Vol. 53 ›› Issue (12): 43-48.doi: 10.19964/j.issn.1006-4990.2021-0557

• Inorganic Noval Materials—Carbon Resources Conversion and Utilization • Previous Articles     Next Articles

Oxidative dehydrogenation of ethane with carbon dioxide to ethylene over Cr/SSZ-13 catalyst

ZHOU Wei1,2(),YU Haibin2,MA Xinbin1()   

  1. 1. Institute of Chemical Engineering,Tianjin University,Tianjin 300350,China
    2. CenterTech Tianjin Chemical Research and Design Institute Co.Ltd.
  • Received:2021-09-13 Online:2021-12-10 Published:2021-12-16
  • Contact: MA Xinbin E-mail:362200922@163.com;xbma@tju.edu.cn

Abstract:

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

CLC Number: