Direct deoxygenation of lignin model compounds into aromatic hydrocarbons through hydrogen transfer reaction

被引:68
|
作者
Guo, Tianye [1 ]
Xia, Qineng [1 ]
Shao, Yi [1 ]
Liu, Xiaohui [1 ]
Wang, Yanqin [1 ]
机构
[1] East China Univ Sci & Technol, Shanghai Key Lab Funct Mat Chem, Res Inst Ind Catalysis, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China
关键词
Lignin model compounds; Direct deoxygenation; Aromatic hydrocarbons; Ru/Nb2O5-SiO2; catalyst; Catalytic hydrogen transfer; O BOND-CLEAVAGE; DIRECT HYDRODEOXYGENATION; WOODY BIOMASS; CATALYTIC CONVERSION; HIGH-YIELD; BIO-OIL; ACID; FRACTIONATION; VALORIZATION; PHENOL;
D O I
10.1016/j.apcata.2017.07.050
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A new route is reported for the direct deoxygenation of lignin model compounds to aromatic hydrocarbons via the catalytic hydrogen transfer reactions over Ru/Nb2O5-SiO2 catalyst with 2-PrOH as a hydrogen donor. It is found that Ru/Nb2O5-SiO2 catalyst is active for the hydrodeoxygenation of p-cresol with 98.5% conversion and 84.0% yield of toluene at 230 degrees C, owing to the significant promotion effect of NbOX species on C-O bond cleavage and the proper transfer hydrogenation activity of Ru. Furthermore, Ru/Nb2O5-SiO2 catalyst also shows excellent performances in the transfer hydrodeoxygenation of various lignin model compounds such as 2-methoxy-4-methyl phenol, benzyl phenyl ether (alpha-O-4 model compound), 2-(2-methoxyphenyl)oxy-l-phenethanol (beta-O-4 model compound) and even the real lignin extracted from birch, into aromatic hydrocarbons with 2-PrOH as the hydrogen donor. The reaction pathway studies of these model compounds demonstrate that the direct deoxygenation (DDO) is the main reaction route over Ru/Nb2O5-SiO2 catalyst in the presence of 2-PrOH. Here, using 2-PrOH as a hydrogen source is found to be more selective to aromatic hydrocarbons than using molecular hydrogen. This work provides a new way for the high selective production of aromatic hydrocarbons from renewable lignin via the catalytic hydrogen transfer reactions.
引用
收藏
页码:30 / 36
页数:7
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