摘要
分别以配合物Pd/PPh3和Ni/PPh3为催化剂,二氯乙烷和乙醇的混合物为介质,非均相催化加氢裂解木质素,产物分为溶解组份和不溶解组份,反应后溶解组份明显增加;当催化剂前体为Ni(OAc)2和NiCl2时,催化活性没有Pd(OAc)2和PdCl2的高;对产物进行粘度测试、热重分析和分子量测定,溶解组份分子量大幅降低;考察反应温度、时间、溶剂、催化剂前体及其用量对催化活性的影响,得到较优化的反应条件:木质素0.5000 g,氯化钯0.0809 g,三苯基膦0.2322 g,温度150℃,时间15 h,介质为1,2-二氯乙烷和乙醇的混合物,体积比为2∶1.
The catalytic hydrogenolysis of alkaline lignin has been carried out by metal complex and PPh 3,such as Pd,Ni.When the catalyst precursors were Ni（OAc） 2 and NiCl 2,the catalytic activities were not as good as that of Pd（OAc） 2 and PdCl 2.The products were characterized by viscosity measurement and thermal gravimetric analysis.The molecular weight of soluble components reduced obviously.Reaction conditions such as temperature,time,solvent,catalyst precursor and catalyst loading were optimized.The optimal reaction conditions were as follows,lignin（0.5000 g）;PdCl 2（0.0809 g）;PPh 3（0.2322 g）;temperature 150 ℃,time 15h,1,2-dichloroethane and ethanol as medium,the volume ratio of 2 ∶ 1.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2012年第6期502-505,共4页
Journal of Molecular Catalysis(China)
基金
the National Natural Science Foundation of China(Nos.20773147,21073211 and 21174155)
Gansu Provincial Science and Technology Support Project(ID:0708NKCA119)
West Light Foundation of the Chinese Academy of Sciences(Y-236)
