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林产化学与工业 ›› 2014, Vol. 34 ›› Issue (5): 15-21.doi: 10.3969/j.issn.0253-2417.2014.05.003

• 研究报告 • 上一篇    下一篇

SO42-/ZrO2固体超强酸催化碱木质素氢还原反应

张盛明, 刘亮, 马艳丽, 方桂珍   

  1. 东北林业大学 材料科学与工程学院, 黑龙江 哈尔滨 150040
  • 收稿日期:2013-08-28 出版日期:2014-10-25 发布日期:2015-08-18
  • 作者简介:张盛明(1986-),男,黑龙江哈尔滨人,硕士生,主要从事天然高分子化学方面的研究
  • 基金资助:
    国家自然科学基金资助项目(31170542)

Hydrogen Reduction of Straw Alkali Lignin Catalyzed by Solid Superacid SO42-/ZrO2

ZHANG Sheng-ming, LIU Liang, MA Yan-li, FANG Gui-zhen   

  1. Material Science and Engineering College, Northeast Forestry University, Harbin 150040, China
  • Received:2013-08-28 Online:2014-10-25 Published:2015-08-18
  • Contact: 方桂珍,教授,博士生导师,主要从事天然高分子方面的研究及教学;E-mail:Fanggz_0@163.com E-mail:Fanggz_0@163.com

摘要: 采用浸渍-焙烧法制备SO42-/ZrO2固体酸催化剂,通过XRD、FT-IR、SEM和Hammett指示剂法对固体酸的结构和酸强度进行表征。考察不同条件制备的SO42-/ZrO2固体酸催化剂,在不同反应条件下对碱木质素氢还原反应的催化作用,并用化学法对反应前后碱木质素官能团进行定量测定。结果表明,硫酸浸渍浓度为1 mol/L,550 ℃焙烧3.5 h制备的SO42-/ZrO2固体超强酸对碱木质素氢还原反应具有较高的催化活性,在催化剂添加量5 %,反应温度100 ℃,时间4 h,氢气压力3 MPa时,反应后碱木质素总羟基、酚羟基和醇羟基分别为9.34%、3.28%和6.06%,较反应前分别增加55.15%、13.89%和93.00%;木质素的苯环结构稳定,活性官能团含量增加,反应活性提高。

关键词: SO42-/ZrO2, 固体超强酸, 碱木质素, 还原反应, 活化

Abstract: Solid superacid SO42-/ZrO2 was prepared by impregnation-calcination method and characterized by XRD, elementary analysis, FT-IR, SEM and Hammett indicator. The reduction reaction of alkali lignin catalyzed by SO42-/ZrO2 with different preparation conditions was conducted under different conditions. The number of functional groups of lignin before and after chemical reaction was determined. The results showed that SO42-/ZrO2 has higher superacidity and catalytic activity after being impregnated with 1 mol/L sulfuric acid and calcined at 550 ℃ for 3.5 h. Under the condition of catalyst dosage 5%, temperature 100 ℃, time 4 h, and H2 pressure 3 MPa, the contents of total hydroxyl, phenolic hydroxyl and alcoholic hydroxyl of alkali lignin were 9.34%, 3.28% and 6.06% after reaction, and increased by 55.15 %, 13.89 % and 93.00 %, respectively, compared with those before reaction. After reaction, the stability of phenyl structure, the content of active functional groups and the reactivity of lignin increased.

Key words: SO42-/ZrO2, solid superacid, alkali lignin, reduction reaction, activation

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