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生物质化学工程 ›› 2019, Vol. 53 ›› Issue (3): 15-23.doi: 10.3969/j.issn.1673-5854.2019.03.003

• 研究报告 • 上一篇    下一篇

介孔氧化硅固载Yb(OTf)3的制备及催化葡萄糖生产乳酸

王石维,王启宝*()   

  • 收稿日期:2018-05-31 出版日期:2019-05-30 发布日期:2019-06-04
  • 通讯作者: 王启宝 E-mail:wqb@cumtb.edu.cn
  • 作者简介:王石维(1989—),男,安徽安庆人,博士生,主要从事有机化学工艺研究工作
  • 基金资助:
    中央级公益性科研院所基本科研业务费专项资金(Z2060302149054)

Preparation of Yb(OTf)3 Immobilized on Mesoporous Silica and Its Catalytic Activity for Lactic Acid Productionfrom Glucose

Shiwei WANG,Qibao WANG*()   

  • Received:2018-05-31 Online:2019-05-30 Published:2019-06-04
  • Contact: Qibao WANG E-mail:wqb@cumtb.edu.cn
  • Supported by:
    中央级公益性科研院所基本科研业务费专项资金(Z2060302149054)

摘要:

采用溶剂法和焙烧法制备了SBA-15和MCM-41两类介孔氧化硅,并以此为载体制备固载型三氟甲基磺酸镱(Yb(OTf)3)催化剂。通过小角X射线衍射(SAXD)、氮气吸附/脱附、29Si固体核磁共振光谱(NMR)、透射电子显微镜(TEM)及热重分析(TG)等方法对载体及催化剂进行表征,研究其在葡萄糖制备乳酸反应中的催化性能。结果表明:溶剂法制备的氧化硅表面羟基含量比焙烧法高,负载的磺酸基团和三氟甲基磺酸镱都更多,催化活性更高;SBA-15的平均孔径比MCM-41的大3 nm左右,这使得SBA-15具有更好的传质性能以及Yb(OTf)2-SBA-15具有更好的催化性能。以Yb(OTf)2-SBA-15-S为催化剂,在2 MPa N2压力、190 ℃下反应60 min,乳酸的收率达到42.35%。

关键词: 介孔氧化硅, 三氟甲基磺酸镱, 葡萄糖, 乳酸

Abstract:

Two kinds of SBA-15 and MCM-41 mesoporous silica were prepared by solvent and calcination method, and they were used as the carrier of the supported ytterbium triflate(Yb(OTf)3) catalysts. The carriers and catalysts were characterized by small angle X-ray diffraction(SAXD), nitrogen adsorption/desorption, 29Si solid state nuclear magnetic resonance spectroscopy(NMR), transmission electron microscope(TEM) and thermogravimetric analysis(TG), and the catalytic performances of these catalysts in the preparation of lactic acid from glucose were evaluated. The experimental results showed that the amount of hydroxyl group of mesoporous silica by solvent method was higher than that of mesoporous silica by calcination method, so its catalytic activity was higher. The average pore size of SBA-15 was about 3 nm larger than that of MCM-41, which led to better mass transfer performance of SBA-15 and better catalytic performance of Yb(OTf)2-SBA-15. The yield of lactic acid could reach 42.35% when it reacted at 2 MPa N2 pressure and 190 ℃ for 60 min with Yb(OTf)2-SBA-15-S as catalyst.

Key words: mesoporous silica, ytterbium triflate, glucose, lactic acid

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