Sorbitol Hydrogenolysis to Glycols over Baisic Additive Promoted Ni-based Catalysts

Abstract

A series of Ni based catalysts with different supports and basic additives were prepared by sequential impregnation method. The catalysts were characterized by XRD, BET, H 2-TPR and CO 2-TPD techniques. It was found that the introduction of basic additives enhanced the basicities of catalyats and promoted the dispersities of Ni particles by strong interaction between Ni 2+ and basic additives. Among the Ni based catalysts, 10%Ni/10%La 2 O 3 /ZrO 2 showed the superior performance in sorbitol hydrogenolysis. The synergistic effect of Ni and La 2 O 3 was proven to play an essential role in selective synthesis of EG and 1,2-PG. In the optimal reaction condition, the catalyst presented 100% sorbitol conversion and over 48% glycols (EG and 1,2-PG) yield. The kinetics study of polyols (sorbitol, xylitol and glycerol) hydrogenolysis showed that polyols with more hydroxyl number have higher activity and products distribution was final results of kinetic balance, which could give us some inspiration about how to change the products selectivity.

Hydrogenolysis of biomass-derived sorbitol over La-promoted Ni/ZrO2 catalysts

“…With La 2 O 3 introduction, the intensity of NiO decreased, which indicated that La 2 O 3 improved the dispersion of NiO by the enhanced interaction between Ni 2+ and La 2 O 3 . 30 With increasing La 2 O 3 in the catalysts, no obvious changes in NiO diffraction patterns could be observed. However, with further increasing La 2 O 3 loading to >10%, the intensity of ZrO 2 and NiO decreased remarkably.…”