Effective conversion of cellobiose and glucose to sorbitol using non-noble bimetallic NiCo/HZSM-5 catalyst

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2018,（9）
• 页码范围: 1167-1174
• 页数: 8页
• 语种: 英文

摘要

The tandem hydrolysis and hydrogenation of saccharides into sorbitol is an especially attractive reaction in the conversion of biomass.Here,an economical and efficient bimetallic catalyst for the transformation of glucose and cellobiose into sorbitol is reported.Non-precious metal based catalysts such as NiCo,Ni,and Co,were prepared via modified impregnation method,and NiCo/HZSM-5 showed superior performance for the synthesis of sorbitol (86.9％ from cellobiose,98.6％ from D-glucose).Various characterizations,such as Brunner-Emmet-Teler (BET),X-ray diffraction (XRD),transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS),confirmed that NiCo alloy formed and highly dispersed in NiCo/HZSM-5 catalyst.The high performance of fabricated catalyst would be attributed to the formation of nickel-cobalt alloy over HZSM-5 zeolite surface.High temperature and H2 pressure were favorable for the tandem hydrolysis and hydrogenation reaction.Besides,the reaction pathway was also proposed based on the kinetics study.Cellobitol was detected as the intermediate in the reaction mixture.Furthermore,in the catalytic stability study,it was found that active metal species of NiCo/HZSM-5 were stable.The deactivation of catalyst would be due to the covering of acidic sites over NiCo/HZSM-5.