| 赵水侠.NaBH4/I2催化加氢还原碱木质素的研究[J].分子催化,2012,(2):105-110 |
| NaBH4/I2催化加氢还原碱木质素的研究 |
| Hydrogenation and hydrogenolysis of Alkali Lignin Catalyzed by NaBH4/I2 |
| 投稿时间：2011-08-15 修订日期：2011-10-18 |
| DOI： |
| 中文关键词: NaBH4/I2，碱木质素，加氢还原 |
| 英文关键词:NaBH4/I2 catalyst alkali lignin hydrogenation |
| 基金项目:中科院西部之光联合学者 |
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| 摘要点击次数: 2564 |
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| 中文摘要: |
| 从麦草碱法制浆黑液中提取木质素，经精制后获得碱木质素；以NaBH4/I2为均相催化剂，在氢气气氛下还原精制的碱木质素，首次发现I2可以作为木质素加氢还原及氢解的均相催化剂；考察不同反应条件，如溶剂、温度和时间对碱木质素催化加氢效果的影响；采用红外光谱和元素分析，表征碱木质素反应前后的结构变化；用自动电位滴定法测定反应前后木质素中总羟基的含量，反应后碱木质素中总羟基的含量为10.19%，较反应前增加43.67%；NaBH4/I2催化碱木质素加氢还原反应的最优条件：以1%的NaOH水溶液作溶剂，m (NaBH4) : m(I2)=1:1，温度175℃，反应时间15 h。 |
| 英文摘要: |
| Lignin was obtained from wheat straw alkaline black liquor and refined by organic solvent. Hydrogenation and hydrogenolysis of alkali lignin was investigated in the presence of catalysts NaBH4/I2 and I2 respectively. The results showed that I2 was a homogeneous catalyst in hydrogenation and hydrogenolysis of lignin. The reaction conditions were optimized. Functional groups of alkali lignin were determined by chemical methods before and after reaction. The products were characterized by Fourier transform infrared spectra and element analysis. The contents of total hydroxyl of lignin were determined by automatic potentiometric titration. The contents of total hydroxyl were 10.19% with an increase of 43.67% compared with the original alkali lignin. The optimum conditions were as follow, NaBH4∶I2=1∶1(mass ratio), T= 175℃, reaction time of 15 h, 1% NaOH water solution as solvent. |
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