Chinese Journal of Catalysis

Chinese Journal of Catalysis ›› 2017, Vol. 38 ›› Issue (11): 1818-1830.DOI: 10.1016/S1872-2067(17)62910-3

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Effects of indium on Ni/SiO2 catalytic performance in hydrodeoxygenation of anisole as model bio-oil compound:Suppression of benzene ring hydrogenation and C-C bond hydrogenolysis

Xiaofei Wang, Jixiang Chen   

  1. Tianjin Key Laboratory of Applied Catalysis Science and Technology, Department of Catalysis Science and Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
  • Received:2017-06-06 Revised:2017-09-01 Online:2017-11-18 Published:2017-11-24
  • Contact: 10.1016/S1872-2067(17)62910-3
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21576193, 21176177).

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Abstract:

SiO2-supported monometallic Ni and bimetallic Ni-In catalysts were prepared and used for hydro-deoxygenation of anisole, which was used as a model bio-oil compound, for BTX (benzene, toluene, and xylene) production. The effects of the Ni/In ratio and Ni content on the structures and perfor-mances of the catalysts were investigated. The results show that In atoms were incorporated into the Ni metal lattice. Although the Ni-In bimetallic crystallites were similar in size to those of mono-metallic Ni at the same Ni content, H2 uptake by the bimetallic Ni-In catalyst was much lower than that by monometallic Ni because of dilution of Ni atoms by In atoms. Charge transfer from In to Ni was observed for the bimetallic Ni-In catalysts. All the results indicate intimate contact between Ni and In atoms, and the In atoms geometrically and electronically modified the Ni atoms. In the hy-drodeoxygenation of anisole, although the activities of the Ni-In bimetallic catalysts in the conver-sion of anisole were lower than that of the monometallic Ni catalyst, they gave higher selectivities for BTX and cyclohexane as a result of suppression of benzene ring hydrogenation and C-C bond hydrogenolysis. They also showed lower methanation activity. These results will be useful for en-hancing carbon yields and reducing H2 consumption. In addition, the lower the Ni/In ratio was, the greater was the effect of In on the catalytic performance. The selectivity for BTX was primarily de-termined by the Ni/In ratio and was little affected by the Ni content. We suggest that the perfor-mance of the Ni-In bimetallic catalyst can be ascribed to the geometric and electronic effects of In.

Key words: Ni-In bimetallic catalyst, Hydrodeoxygenation, C-C bond hydrogenolysis, Anisole, BTX