Effects of W/Ni on the Catalytic Performance of NiO-WO3/γ-Al2O3 Catalyst for Oxidative Dehydrogenation of Isobutane

Related Articles

Abstract NiO-WO₃/γ-Al₂O₃catalysts were prepared by stepwise impregnation method. The catalysts were characterized by X-ray diffraction, FT-Raman spectroscopy, temperature programmed reduction, NH₃-temperature programmed desorption, UV-diffuse reflectance spectrum. The effects of W/Ni ratio on surface structure, distribution of active species and catalytic performance for selective oxidation of isobutane were investigated. The results show that n(W)/n(Ni) has a significant impact to surface active species of catalysts. WO₃ crystal and Ni-Al spinel are mainly observed when the W content increases. However, in Ni-rich catalysts, polytungstate, NiWO₄ and Ni-Al spinel species are mainly observed on the surface of catalysts. Addition of W at a proper amount obviously improves the catalytic performance of catalyst for selective oxidation of isobutene and the number of strong acid sites on the catalyst surface. The catalysts have the best performance for selective oxidation of isobutene when n(W)/n(Ni+W)=0.2, which is especially related to dehydrogenation capability of active species, lattice oxygen activity and surface acidity of the catalyst.

	Service

	Email this article
	Add to my bookshelf
	Add to citation manager
	Email Alert
	RSS
	Articles by authors

Keywords： n(W)/n(Ni); NiO-WO₃/γ-Al₂O₃ catalyst; selective oxidative dehydrogenation; isobutane; isobutene

Received 2013-03-25;

About author:

Cite this article:

Chen Chuan, Wang Xitao.Effects of W/Ni on the Catalytic Performance of NiO-WO₃/γ-Al₂O₃ Catalyst for Oxidative Dehydrogenation of Isobutane[J] Chemcial Industry and Engineering, 2015,V32(1): 26-30

[1]	张明杰, 阎子峰. 异丁烷脱氢催化剂的研究进展[J].石油化工.2004, 33(4):377-381
[2]	宋艳敏, 孙守亮, 孙振乾. 异丁烷催化脱氢制异丁烯技术研究[J].精细与专用化学品.2006, 14(17):10-12
[3]	王绍卿. 由异丁烷脱氢制异丁烯的生产技术问题[J]. 石化技术, 1994, 1: 57-60
[4]	Elbashir N O, Al-Zahrani S M, Abasaeed A E, et al. Alumina-Supported chromium-based mixed-oxide catalysts in oxidative dehydrogenation of isobutane to isobutene[J].Chemical Engineering and Processing: Process Intensification.2003, 42(10):817-823
[5]	李丽, 阎子峰. 异丁烷脱氢催化剂的研究[J].化学进展.2005, 17(4):651-659
[6]	Heracleous E, Lee A F, Wilson K, et al. Investigation of Ni-based alumina-supported catalysts for the oxidative dehydrogenation of ethane to ethylene: Structural characterization and reactivity studies[J].Journal of Catalysis.2005, 231(1):159-171
[7]	SalvatiJr L, Makovsky L E, Stencel J M, et al. Surface spectroscopic study of tungsten-alumina catalysts using X-ray photoelectron, ion scattering, and Raman spectroscopies[J]. The Journal of Physical Chemistry, 1981, 85(24): 3 700-3 707
[8]	Song C J, Kwak C, Moon S H. Effect of fluorine addition on the formation of active species and hydrotreating activity of NiWS/Al₂O₃ catalysts[J].Catalysis Today.2002, 74(3):193-200
[9]	Scheffer B, Heijeinga J J, Moulijn J A. An electron spectroscopy and X-ray diffraction study of nickel oxide/alumina and nickel-oxide-tungsten trioxide/alumina catalysts[J].Journal of Physical Chemistry.1987, 91(18):4-
[10]	Zhang Y, Xiong G, Sheng S, et al. Interaction of NiO with γ-Al₂O₃ supporter of NiO/γ-Al₂O₃ catalysts[J]. Acta Phys Chim Sin, 1999, 15(8): 735-741