Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (09): 2135-2140.doi: 10.3866/PKU.WHXB201206271

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Oxidative Dehydrogenation of Propane to Propylene over Mesoporous Alumina Supported Ni-Co Oxide Catalysts

SUN Yi-Fei, LI Guang-Chao, PAN Xin-Di, HUANG Chuan-Jing, WENG Wei-Zheng, WAN Hui-Lin   

  1. State Key Laboratory of Physical Chemistry of Solid Surfaces, National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, P. R. China
  • Received:2012-04-18 Revised:2012-06-26 Published:2012-08-02
  • Contact: HUANG Chuan-Jing, WAN Hui-Lin E-mail:huangcj@xmu.edu.cn; hlwan@xmu.edu.cn
  • Supported by:

    The project was supported by the National Key Basic Research Program of China (973) (2010CB732303), National Natural Science Foundation of China (21173173, 21073148, 21033006), Program for Innovative Research Team of the Ministry of Education of China (IRT1036), National Foundation for Fostering Talents of Basic Science, China (J1030415), and Key Scientific Project of Fujian Province, China (2009HZ0002-1).

Abstract:

A series of mesoporous alumina supported nickel oxide, cobalt oxide, and bimetallic nickelcobalt oxide catalysts were synthesized by a one-pot method, using nonionic triblock copolymer as a template and aluminum isopropoxide as the source of aluminum. For comparison, an additional supported Ni-Co oxide catalyst was prepared by impregnation, using mesoporous alumina as the support. The catalysts were tested for the oxidative dehydrogenation of propane, and their structure and properties were characterized by N2 adsorption-desorption, high-resolution transmission electron microscopy (HRTEM), powder X-ray diffraction (XRD), temperature-programmed H2 reduction (H2-TPR), and laser Raman spectroscopy (LRS). All samples synthesized by the one-pot method had large surface area, highly ordered mesoporous structure, and highly dispersed supported oxide species. However, in the sample prepared by impregnation, the mesostructure of the carrier was destroyed with the formation of Co3O4 phase. Among the catalysts studied, the mesoporous alumina supported Ni-Co oxide catalyst from one-pot synthesis showed the best catalytic performance for propane oxidation to propylene. On this catalyst a 10.3% propylene yield was obtained at 450 ° C, C3H8:O2:N2 molar ratio of 1:1:4, and gas hourly space velocity (GHSV) of 10000 mL·h-1·g-1. This result was much higher than the yield of 2.4% obtained from the catalyst prepared by impregnation. Combining the results of characterization and catalytic reaction, the relationship between structure and performance of the catalysts was discussed. The large difference observed in catalytic performance between catalysts prepared by one-pot and impregnation methods was attributed to their different structures, including textural structure, and dispersion of the supported metal oxide species.

Key words: Propane, Propylene, Oxidative dehydrogenation, Ni-Co oxide catalyst, Mesoporous alumina, One-pot method

MSC2000: 

  • O643