Dehydrogenation of Isobutane to Isobutene over Nickel Phosphide Catalyst in the Presence of Hydrogen

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Abstract

Nickle phosphide catalysts were prepared by combining the method of incipient wetness impregnation and temperature-programmed reduction, using silica as the support. The effects of different Ni/P molar ratios and different loadings on catalysts structure and isobutane dehydrogenation performance were investigated. The structure and constitute, reducing property and hydrogen adsorption performance were characterized by TEM, XRD, H₂-TPR and H₂-TPD. The results prove that Ni/P molar ratios make great effect on the surface material, that catalysts contained phase-pure Ni₂P on the silica when Ni/P molar ratios were 1.0 and 0.5, and when Ni/P molar ratio was 1.5 to yield Ni₁₂P₅. Ni₂P particles with low loading were well distributed, but the particles become larger and uniformly with the increase of loading. Nickel phosphide catalysts have dehydrogenation activities and Ni₂P have a better performance than Ni₁₂P₅, the catalyst have the best performance for isobutene selectivity higher than 80% when n(Ni)/n(P)=1.0, loading 10%, n(H₂)/n(i-C₄H₁₀)=1.0, 800 h^-1, 460 ℃.

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	Articles by authors
	Xu Yanli
	Wang Xitao

Keywords： nickel phoside； isobutane； isobutene； dehydrogenation

Received 2014-03-03;

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Xu Yanli, Wang Xitao.Dehydrogenation of Isobutane to Isobutene over Nickel Phosphide Catalyst in the Presence of Hydrogen[J] Chemcial Industry and Engineering, 2016,V33(2): 17-22

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