Dehydrogenation of propane to propylene with lattice oxygen over CrOy/Al2O3-ZrO2 catalysts

作者：Kim Tae Hyeop; Kang Ki Hyuk; Baek Minsung; Song Ji Hwan; Hong Ung Gi; Park Deuk Soo; Choi Won Choon; Park Yong Ki; Song In Kyu^*

来源：Molecular Catalysis, 2017, 433: 1-7.

DOI：10.1016/j.mcat.2016.12.004

• Propane
• Dehydrogenation
• Propylene
• Chromia catalyst
• Oxygen capacity

A series of CrOy/Al2O3-ZrO2 (denoted as Cr/AZ-X) catalysts with different Zr/Al molar ratio (X) were prepared by an epoxide-driven sol-gel method and a subsequent impregnation method. They were then applied to the dehydrogenation of propane to propylene with lattice oxygen of the catalysts. The effect of zirconia addition on the physicochemical properties and catalytic activities of Cr/AZ-X catalysts was investigated. Surface area and pore volume of Cr/AZ-X (X = 0, 0.05, 0.10, 0.15, and 0.20) catalysts decreased with increasing Zr/Al molar. It was found that the amount of penta-coordinated aluminum species increased with increasing Zr/Al molar ratio. It was also observed that dispersion and coordination state of chromium species could be controlled by the addition of zirconia into alumina support. Initial conversion of propane and initial yield for propylene showed volcano-shaped trends with respect to Zr/Al molar ratio. This result was well correlated with the amount of lattice oxygen of Cr/AZ-X catalysts. Among the catalysts, Cr/AZ-0.10 catalyst with the largest amount of lattice oxygen showed the best catalytic performance in the dehydrogenation of propane to propylene with lattice oxygen.

• 出版日期2017-5