2.1 Materials
All chemicals used were analytical grade without further purification. Glucosamine hydrochloride, melamine, Ni(OAc)2•4H2O, active carbon (AC), Raney nickel and Ru/C were purchased from Aladdin Chemistry Co. Ltd (China). 2-phenoxy-1-phenethanol, phenethoxybenzene, phenol, ethylbenzene, phenylethyl alcohol were purchased from Alfa Aesar Co. Inc. (China). Birch wood was purchased from Shandong wood Co. Ltd. (China).