Citation: LI Feng-xu, WANG Xiao-fei, ZHENG Ying, CHEN Ji-xiang. Influence of metallic promoters on the performance of Ni/SiO₂ catalyst in the hydrodeoxygenation of anisole[J]. Journal of Fuel Chemistry and Technology, ;2018, 46(1): 75-83. shu

Influence of metallic promoters on the performance of Ni/SiO₂ catalyst in the hydrodeoxygenation of anisole

Tianjin Key Laboratory of Applied Catalysis Science and Technology, Department of Catalysis Science and Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China

Corresponding author: CHEN Ji-xiang, jxchen@tju.edu.cn
Received Date: 6 June 2017
Revised Date: 16 October 2017

Fund Project: The project was supported by the National Natural Science Foundation of China (21576193)the National Natural Science Foundation of China 21576193

Figures(8)

Ni/SiO₂ and Ni-based bimetallic Ni₃₀M/SiO₂ catalysts (with a Ni/M atomic ratio of 30; M=Fe, Co, Cu, Zn and Ga) were prepared by the impregnation method and characterized by the means of H₂-TPR, XRD, H₂ chemisorption, NH₃-TPD and N₂ sorption; the effect of M promoters on the structure and performance Ni-based catalysts in the hydrodeoxygenation of anisole was investigated. The results indicated that the metallic promoters have a significant influence on the reducibility of nickel species, due to the interaction between M and Ni species, although the sizes of Ni-M bimetallic crystallites in Ni₃₀M/SiO₂ are similar to that of Ni crystallite in Ni/SiO₂. Because of the interaction between Ni and M and the enrichment of certain M promoters on the surface of Ni-M bimetallic particles, the adsorption quantity of H₂ on Ni₃₀M/SiO₂ is lower than that on Ni/SiO₂. In addition, the Ni₃₀M/SiO₂ catalysts also have more acid sites (especially the weak ones) than Ni/SiO₂. For the hydrodeoxygenation of anisole under 300℃, 0.1 MPa, weight hourly space velocity (WHSV) of anisole of 1.0 h^-1 and H₂/anisole molar ratio of 25, the Ni₃₀M/SiO₂ catalysts exhibit lower anisole conversion than Ni/SiO₂, probably due to the lower H₂ uptakes on the bimetallic catalysts. However, Ni₃₀Ga/SiO₂ and Ni₃₀Zn/SiO₂ give much higher selectivities to BTX (benzene, toluene and xylene) (81.7% and 76.8%, respectively) than Ni/SiO₂ (71.5%). Meanwhile, Ni₃₀Zn/SiO₂ exhibits higher activity in methyl transfer and lower activity in C-C bond hydrogenolysis than other catalysts; owing to the high oxophilicity of Zn, from the aspects of increasing carbon yield and reducing H₂ consumption, Ni₃₀Zn/SiO₂ is probably an appropriate catalyst in hydrodeoxygenation.
- Ni-based catalyst,
- metallic promoter,
- anisole,
- hydrodeoxygenation,
- hydrogenolysis,
- methanation.
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Influence of metallic promoters on the performance of Ni/SiO2 catalyst in the hydrodeoxygenation of anisole

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Influence of metallic promoters on the performance of Ni/SiO₂ catalyst in the hydrodeoxygenation of anisole