Influence of Cr/Zr Ratio on Activity of Cr-Zr Oxide Catalysts in Non-Oxidative Propane Dehydrogenation

Two series of chromium-zirconium mixed oxide catalysts with different Cr/Zr molar ratio are prepared by co-precipitation method. Porous structure of the catalysts is studied by low-temperature N-2 adsorption-desorption. Phase composition and chromium states in the catalysts are characterized by X-ray diffraction (XRD), UV-visible spectroscopy, and temperature-programmed reduction with hydrogen (TPR-H-2). The mixed catalysts are tested in non-oxidative dehydrogenation of propane at 550 & DEG;C. The catalysts synthesized without ageing of precipitate show higher activity in propane dehydrogenation due to the higher content of reducible Cr+5/(+6) species due to its stabilization on the ZrO2 surface.

Automated summary

Two series of chromium-zirconium mixed oxide catalysts with different Cr/Zr molar ratio were prepared by co-precipitation method. The catalysts synthesized without ageing of precipitate showed higher activity in propane dehydrogenation, likely due to the higher content of reducible Cr+5/(+6) species stabilized on the ZrO2 surface.