Enhanced selective hydrogenation of glycolaldehyde to ethylene glycol over Cu^(0)-Cu^(+)sites  

作　　者：Qi Yang Weikang Dai Maoshuai Li Jie Wei Yi Feng Cheng Yang Wanxin Yang Ying Zheng Jie Ding Mei-Yan Wang Xinbin Ma 

机构地区：[1]Key Laboratory for Green Chemical Technology of Ministry of Education,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China [2]Joint School of National University of Singapore and Tianjin University,International Campus of Tianjin University,Fuzhou 350207,China [3]Haihe Laboratory of Sustainable Chemical Transformations,Tianjin 300192,China

出　　处：《Chinese Journal of Chemical Engineering》2023年第5期141-150,共10页中国化学工程学报（英文版）

基　　金：supported by the National Key Research and Development Program of China (2018YFA0704502);Haihe Laboratory of Sustainable Chemical Transformations (CYZC202101)。

摘　　要：Selective hydrogenation of hydroxyaldehydes to polyalcohols is challenging due to the competitive hydrogenation of C=O and CAO.This study develops heterogeneous Cu catalysts for the selective synthesis of ethylene glycol via batch liquid-phase hydrogenation of glycolaldehyde.SiO_(2)supported Cu,fabricated by ammonia evaporation,enables to catalyze the C=O bond hydrogenation with retaining the CAO bond intact,yielding higher selective hydrogenation activity with ethylene glycol selectivity up to 99.8%relative to MgO,Al_(2)O_(3),CeO_(2),and TiO_(2)supports and Cu/SiO_(2)synthesized by deposition–precipitation and impregnation.Characterizations confirm that highly efficient 20Cu/SiO_(2)-AE-623 K catalyst fabricated by ammonia evaporation is featured with larger Cu^(0)and Cu^(+)surface areas,of which the Cu^(+)species created from reducing copper phyllosilicate exhibit higher reactivity.A synergistic effect between Cu^(+)and Cu^(0)facilitates the selective adsorption/activation of glycolaldehyde on Cu^(+)sites and the dissociation of H_(2)on Cu^(0)sites,bringing a remarkable improvement in the selective hydrogenation performance.

关 键 词：HYDROGENATION Multiphase reaction Biomass Copper phyllosilicate Ammonia evaporation 

分 类 号：TQ223.162[化学工程—有机化工]