使用担载型贵金属催化剂和磷酸在不同温度下通过两步法加氢降解二氧六环木质素.第一步反应使用Rh/C和浓度为1%(w)的磷酸为催化剂,在270°C和4MPa氢气气氛下反应后通过气相色谱(GC)和气相色谱-质谱(GC-MS)分析木质素单体和二聚体,总收率最高可达16.9%.通过傅里叶变换红外(FTIR)光谱、X射线光电子能谱(XPS)、元素分析(EA)和凝胶渗透色谱(GPC)等方法研究第一步反应产物的变化.结果发现,二氧六环木质素中的C-O-C键被打断,木质素分子量降低,部分羰基和羧基被脱除.随着反应温度的上升,产物的含氧量不断下降,在270°C反应10h后氧含量从35%(w)降低至21%(w).结合不同的表征方法,提出二氧六环木质素的第一步反应路径.第二步反应中使用Pd/C和磷酸为催化剂在250°C可以将木质素单体、二聚体高选择性地加氢脱氧转化为对应的烃类产物. Diol lignin was hydrogenated by a two-step process at different temperatures using a supported noble metal catalyst and phosphoric acid.The first reaction was performed using Rh / C and 1% (w) phosphoric acid as a catalyst at 270 ° The total yield of lignin and dimer was analyzed by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS) under C and 4MPa hydrogen atmosphere, and the total yield could reach 16.9% .Four Fourier transform infrared FTIR spectroscopy, X-ray photoelectron spectroscopy (XPS), elemental analysis (EA) and gel permeation chromatography (GPC) were used to investigate the changes of the first step reaction products.It was found that the COC bonds in dioxane lignin Was interrupted, lignin molecular weight decreased, part of the carbonyl and carboxyl groups were removed.With the rise of the reaction temperature, the oxygen content of the product continues to decline, after the reaction at 270 ° C 10h oxygen content decreased from 35% (w) to 21 % (w) .According to different characterization methods, the first reaction path of dioxane lignin is proposed.The second step reaction using Pd / C and phosphoric acid as catalyst at 250 ° C can lignin monomer, The polyesters are hydro-deoxygenated selectively to the corresponding hydrocarbon products.