催化学报 ›› 2014, Vol. 35 ›› Issue (2): 270-276.DOI: 10.1016/S1872-2067(12)60749-9

• 研究论文 • 上一篇    

Effects of Bi and Ni on the properties of a vanadium phosphorus oxide catalyst

Yun Hin Taufiq-Yapa,b, Choon Seon Yuena,b, Nawi @ Mohamed Nurul Suzianaa,b, Ramli Irmawatia,b   

  1. a Catalysis Science and Technology Research Centre, Faculty of Science, University Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia;
    b Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
  • 收稿日期:2013-08-05 修回日期:2013-11-14 出版日期:2014-01-16 发布日期:2014-01-17
  • 通讯作者: Yun Hin Taufiq-Yap
  • 基金资助:

    This work was supported by the Ministry of Science, Technology and Innovation of Malaysia.

Effects of Bi and Ni on the properties of a vanadium phosphorus oxide catalyst

Yun Hin Taufiq-Yapa,b, Choon Seon Yuena,b, Nawi @ Mohamed Nurul Suzianaa,b, Ramli Irmawatia,b   

  1. a Catalysis Science and Technology Research Centre, Faculty of Science, University Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia;
    b Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
  • Received:2013-08-05 Revised:2013-11-14 Online:2014-01-16 Published:2014-01-17
  • Contact: Yun Hin Taufiq-Yap
  • Supported by:

    This work was supported by the Ministry of Science, Technology and Innovation of Malaysia.

摘要:

Vanadium phosphorus oxide (VPO) catalysts were synthesized by the dihydrate method which involved the two steps for the preparation of the dihydrate (VOPO4×2H2O) and the precursor hemihydrate (VOHPO4×0.5H2O). Bi and Ni salt were added into the mixture of VOPO4×2H2O and isobutanol, and the obtained precursors were calcined in a flow of a n-butane/air mixture to produce the promoted VPO catalysts. The catalysts were characterized by X-ray diffraction (XRD), N2 adsorption-desorption, inductively coupled plasma-atomic emission spectroscopy, scanning electron microscopy (SEM), and H2 temperature-programmed reduction (H2-TPR). Their catalytic properties were tested using a fixed-bed microreactor. All the catalysts gave main XRD peaks at 2θ = 22.9°, 28.5°, and 30.0°, attributing to the (020), (204), and (221) planes of the pyrophosphate phase (VO)2P2O7, respectively. The promoted catalysts have smaller crystallite size and higher specific surface areas. SEM micrographs revealed the formation of more prominent plate-like crystallites that were arranged as rosette clusters. H2-TPR results showed that the promoted catalysts had lower reduction peak temperatures and possessed higher amounts of V5+-O2- and V4+-O- pairs, which gave higher selectivity and activity in the selective oxidation of n-butane to maleic anhydride.

关键词: Vanadium phosphorus oxide catalyst, Promoter, n-Butane oxidation, Maleic anhydride selectivity

Abstract:

Vanadium phosphorus oxide (VPO) catalysts were synthesized by the dihydrate method which involved the two steps for the preparation of the dihydrate (VOPO4×2H2O) and the precursor hemihydrate (VOHPO4×0.5H2O). Bi and Ni salt were added into the mixture of VOPO4×2H2O and isobutanol, and the obtained precursors were calcined in a flow of a n-butane/air mixture to produce the promoted VPO catalysts. The catalysts were characterized by X-ray diffraction (XRD), N2 adsorption-desorption, inductively coupled plasma-atomic emission spectroscopy, scanning electron microscopy (SEM), and H2 temperature-programmed reduction (H2-TPR). Their catalytic properties were tested using a fixed-bed microreactor. All the catalysts gave main XRD peaks at 2θ = 22.9°, 28.5°, and 30.0°, attributing to the (020), (204), and (221) planes of the pyrophosphate phase (VO)2P2O7, respectively. The promoted catalysts have smaller crystallite size and higher specific surface areas. SEM micrographs revealed the formation of more prominent plate-like crystallites that were arranged as rosette clusters. H2-TPR results showed that the promoted catalysts had lower reduction peak temperatures and possessed higher amounts of V5+-O2- and V4+-O- pairs, which gave higher selectivity and activity in the selective oxidation of n-butane to maleic anhydride.

Key words: Vanadium phosphorus oxide catalyst, Promoter, n-Butane oxidation, Maleic anhydride selectivity