Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (11): 2697-2704.doi: 10.3866/PKU.WHXB201207091

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Highly-Dispersed NiO Nanoparticles on SBA-15 for Oxidative Dehydrogenation of Propane to Propylene

LU Huai-Qian, SHI Lei, HE Chong, WENG Wei-Zheng, HUANG Chuan-Jing, WAN Hui-Lin   

  1. State Key Laboratory of Physical Chemistry of Solid Surfaces, National Engineering Labo-ratory for Green Chemical Productions of Alcohols, Ethers and Esters, Department of Chem-istry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, P. R. China
  • Received:2012-05-25 Revised:2012-07-09 Published:2012-10-17
  • Contact: WENG Wei-Zheng, WAN Hui-Lin E-mail:wzweng@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), and Key Scientific Project of Fujian Province, China (2009HZ0002-1).

Abstract:

A series of NiO/SBA-15 (wNiO=20%) catalysts were prepared by impregnating SBA-15 with an aqueous solution of nickel nitrate followed by calcining under three different atmospheres. The resulting materials were studied with regard to the oxidative dehydrogenation of propane (ODHP) to propylene. Compared to the catalysts calcined under either static or moving air, the NiO/SBA-15-NO catalyst calcined under flowing 1%NO/He (VNO/VHe=1:99) atmosphere demonstrated greater activity for this reaction at low temperature. Propylene yield of ~13% with propane conversion of ~29% was obtained at 350 ℃ and the propylene selectivity remained at about 45% even when the reaction temperature was raised to 450 ℃. X-ray diffraction (XRD), transmission electron microscopy (TEM), H2-temperature program reduction (H2-TPR), and O2-temperature program desorption (O2-TPD) characterizations were used to investigate the intrinsic differences between these NiO/SBA-15 catalysts. It was found that NiO species in the catalyst calcined under 1%NO/He atmosphere were highly dispersed inside the mesopores of SBA-15. With the increasing of NiO dispersion on the support, the quantity of NiO species with a reduction temperature above 450 ℃ increased significantly. In addition, the density of O-species on the catalyst calcined under 1%NO/He was much higher than that in the case of the other two samples. These factors are responsible for the superior performance of the NiO/SBA-15-NO catalyst for the ODHP reaction over the temperature range 350 to 450 ℃.

Key words: NiO/SBA-15, Propane, Oxidative dehydrogenation, Propylene, Calcination atmosphere

MSC2000: 

  • O643