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通过元素分析仪和X射线荧光光谱对碱木质素组成进行了分析。在水-乙醇〔V(水)∶V(乙醇)=50∶50〕溶剂中280℃,2 MPa初始氢压下降解碱木质素。利用傅里叶变换红外光谱(FTIR)对反应前后碱木质素结构进行了表征,反应后醚键减少,碳氢键增加。利用凝胶渗透色谱对二氯甲烷可溶产物进行了分析。利用气相色谱-质谱联用仪(GC-MS)和配有氢火焰离子化检测器的气相色谱(GC-FID)对单体产物进行定性定量分析,无催化剂时单酚收率为4.57%。磷化镍催化剂的加入可使单酚收率翻倍,磷化钼作为催化剂时单酚收率与磷化镍作为催化剂时相似,但出现苯甲醇类物质和大量的直链含氧有机物,单酚质量分数很低。
The alkali lignin composition was analyzed by elemental analysis and X-ray fluorescence spectroscopy. Alkali lignin was degraded at 280 ° C under an initial hydrogen pressure of 2 MPa in a water-ethanol [V (water): V (ethanol) = 50:50] solvent. The alkali lignin structure was characterized by Fourier transform infrared spectroscopy (FTIR) before and after the reaction. The ether bond and the hydrocarbon bond increased after the reaction. Methylene chloride soluble products were analyzed by gel permeation chromatography. Monomer products were qualitatively and quantitatively analyzed by gas chromatography-mass spectrometry (GC-MS) and gas chromatography with flame ionization detector (GC-FID). The yield of monophenol without catalyst was 4.57%. The addition of nickel phosphide catalyst can double the yield of monophenol, and the yield of monophenol is similar to that of nickel phosphide when using molybdenum phosphide as catalyst, but the presence of benzyl alcohol and a large amount of straight-chain oxygen-containing organic compounds Phenol content is low.