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2MPaN2压力、1 90℃下反应60min,乳酸的收率达到42.35%。
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.
作者
王石维
王启宝
WANG Shiwei;WANG Qibao(China University of Mining & Technology(Beijing), School of Chemical & Environmental Engineering, Beijing 100083, China)
出处
《生物质化学工程》
CAS
北大核心
2019年第3期15-23,共9页
Biomass Chemical Engineering
基金
中央级公益性科研院所基本科研业务费专项资金(Z2060302149054)
