Citation:
Xiaofei Wang, Jixiang Chen. 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[J]. Chinese Journal of Catalysis,
;2017, 38(11): 1818-1830.
doi:
10.1016/S1872-2067(17)62910-3
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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.
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