《PdC催化剂对碱木质素的活化作用》.pdf

中国林学会木材科学分会第九次学术研讨会论文集 Pd/C 催化剂对碱木质素的活化作用 李丽英 方桂珍 任世学 （东北林业大学材料科学与工程学院, 黑龙江 哈尔滨 150040） 要：本论文采用甲醛还原法制备钯/炭-Pd/C 催化剂，考察了活性炭负载钯催化剂对麦秆碱木质素的催化作 用，用化学法对反应前后碱木质素官能团进行了定量测定，用FTIR 和UV 光谱对木质素化学结构进行了分析，结果 表明，负载钯催化剂对碱木质素官能团反应具 较高的催化活性，碱木质素总羟基含量增加了46.95 ％，酚羟基含量 增加了33.74% ，醇羟基含量增加了63.93% ；羧基含量降低，总酸性基变化不大，木质素的苯环结构稳定，活性官能 团增加，反应活性提高，钯/炭-Pd/C 催化剂对木质素还原活化反应具有良好的催化作用。 关键词：Pd/C 催化剂, 碱木质素, 活化 Alkali Lignin Activated by Pd/C Catalyst Li Liying Fang Guizhen Ren Shixue (College of Materials Science and Engineering, Northeast Forestry University, Harbin, 150040, China) Abstract: This paper has introduced that the Pd/C catalyst was made by the method of formaldehyde deoxidation. The catalytic activity of active carbon supported palladium in the alkali lignin from the straw was investigated. The function group of alkali lignin mensurated quantificationally by the chemical methods and the chemical structure analysed by the spectrum of FTIR and UV were indicated that the catalyst had higher catalytic activity on alkali lignin. It was found that the content of reactive function group, the total hydroxyl increased 49.95 percent, the phenolic hydroxyl increased 33.74 percent, the aliphatic hydroxyl increased 63.93 percent. The content of carboxyl was reduced and the total acidic group had little changes. The phenyl structure of lignin was steady. The active function group of alkali lignin was increased so that the reactive activity was enhanced. So the alkali lignin deoxidized by the Pd/C catalyst had better catalytic acti