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Cu, Fe, or Ni doped molybdenum oxide supported on Al2O3 for the oxidative dehydrogenation of ethylbenzene

Tiago Pinheiro Braga ,  Antônio Narcísio Pinheiro ,  Edson R. Leite ,  Regina Cláudia R. dos Santos ,  Antoninho Valentini

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引用本文: Tiago Pinheiro Braga, Antônio Narcísio Pinheiro, Edson R. Leite, Regina Cláudia R. dos Santos, Antoninho Valentini. Cu, Fe, or Ni doped molybdenum oxide supported on Al2O3 for the oxidative dehydrogenation of ethylbenzene[J]. 催化学报, 2015, 36(5): 712-720. doi: 10.1016/S1872-2067(14)60313-2 shu
Citation:  Tiago Pinheiro Braga, Antônio Narcísio Pinheiro, Edson R. Leite, Regina Cláudia R. dos Santos, Antoninho Valentini. Cu, Fe, or Ni doped molybdenum oxide supported on Al2O3 for the oxidative dehydrogenation of ethylbenzene[J]. Chinese Journal of Catalysis, 2015, 36(5): 712-720. doi: 10.1016/S1872-2067(14)60313-2 shu

Cu, Fe, or Ni doped molybdenum oxide supported on Al2O3 for the oxidative dehydrogenation of ethylbenzene

    通讯作者: Tiago Pinheiro Braga
摘要: Molybdenum-based catalysts supported on Al2O3 doped with Ni, Cu, or Fe oxide were synthesized and used in ethylbenzene dehydrogenation to produce styrene. The molybdenum oxide was supported using an unconventional route that combined the polymeric precursor method (Pechini) and wet impregnation on commercial alumina. The samples were characterized by X-ray diffraction (XRD), N2 adsorption-desorption isotherms, temperature-programmed reduction of H2 (H2-TPR), and thermogravimetric (TG) analysis. XRD results showed that the added metals were well dispersed on the alumina support. The addition of the metal oxide (Ni, Cu, or Fe) of 2 wt% by wet impregnation did not affect the texture of the support. TPR results indicated a synergistic effect between the dopant and molybdenum oxide. The catalytic tests showed ethylbenzene conversion of 28%-53% and styrene selectivity of 94%-97%, indicating that the addition of the dopant improved the catalytic performance, which was related to the redox mechanism. Molybdenum oxides play a fundamental role in the oxidative dehydrogenation of ethylbenzene to styrene by its redox and acid-base properties. The sample containing Cu showed an atypical result with increasing conversion during the reaction, which was due to metal reduction. The Ni-containing solid exhibited the highest amount of carbon deposited, shown by TG analysis after the catalytic test, which explained its lower catalytic stability and selectivity.

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  • 发布日期:  2015-05-20
  • 收稿日期:  2015-01-09
  • 网络出版日期:  2015-02-03
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