2-Methylfuran Vapor-phase Hydrogenation on Nickel-based Catalysts:The Effect of Support
2-Methyltetrahydrofuran(2-MTHF)is an important new green solvent,which can be prepared by catalytic hydrogenation of the biomass derivative 2-methylfuran(2-MF).Supported nickel-based catalysts(Ni/SiO2,Ni/ZSM-5 and Ni/MgO)were prepared by impregnation method.The performance of the catalysts,for the synthesis of 2-MTHF from 2-MF hydrogenation in vapor-phase was studied,and the influence of support properties on catalyst performance was investigated.The catalysts were characterized by N2 isothermal adsorption-desorption,XRD,H2-TPR,NH3-TPD,Py-IR and TEM.The results showed that the activity of the catalysts followed the order of Ni/SiO2>Ni/ZSM-5>Ni/MgO.The SiO2 support with large specific surface area and pore size can improve the dispersion of Ni species,reduce the grain size of Ni,and thus improve the activity of the catalyst.The specific surface area of the MgO support is small,and it forms the MgNiO2 species with Ni,which is difficult to be reduced,so it can only provide a small amount of active Ni,and the activity of the catalyst is relatively low.The acidity of the catalyst has a significant impact on the selectivity of 2-MTHF,with the order of acidity being Ni/MgO<Ni/SiO2<Ni/ZSM-5.The surface acidity of Ni/MgO catalyst is low,resulting in higher selectivity for 2-MTHF.The Ni/ZSM-5 catalyst has the highest acidity,leading to an increase in by-products and a decrease in 2-MTHF selectivity.The catalyst of Ni/SiO2 exhibited optimal catalytic performance with a large specific surface area,pore volume,pore size and moderate acidity,with a 2-MF conversion rate of 97.4%and a 2-MTHF selectivity of 98.4%.
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