【摘要】：采用化學(xué)修飾法將磺酸功能化離子液體[SO_3H-(CH_2)_3-HIM][HSO_4]負(fù)載在磁性納米顆粒Fe_3O_4表面,制備了一種磁性顆粒負(fù)載磺酸催化劑Fe_3O_4@SiO_2-IL,并將Fe_3O_4@SiO_2-IL用于催化纖維素水解反應(yīng)。采用FT-IR和TEM對(duì)催化劑進(jìn)行了表征,并考察了反應(yīng)溫度、反應(yīng)時(shí)間、催化劑用量和水用量對(duì)纖維素水解還原糖產(chǎn)率的影響。Fe_3O_4@SiO_2-IL樣品在FT-IR光譜中的—SO3H吸收峰和咪唑環(huán)的峰,說(shuō)明離子液體被成功地負(fù)載到Fe_3O_4@SiO_2表面;TEM分析顯示,Fe_3O_4磁核的顆粒大小約為250 nm,經(jīng)過(guò)包裹和離子液體修飾的磁性顆粒表面并無(wú)明顯變化。當(dāng)纖維素用量為0.1 g,離子液體1-丁基-3-甲基咪唑氯鹽([Bmim]Cl)的用量為2.0g,磁性催化劑用量為0.2g,水用量為0.2g,反應(yīng)溫度100℃,反應(yīng)時(shí)間40 min時(shí),纖維素水解還原糖產(chǎn)率可達(dá)52.5%,并且磁性催化劑具有較好的磁性分離性能和重復(fù)使用性能,重復(fù)使用5次后,纖維素水解還原糖產(chǎn)率并無(wú)明顯降低。
[Abstract]:The sulfonic acid functionalized ionic liquid [SO_3H- (CH_2) 3-HIM] [HSO_4] was supported on the surface of magnetic nanoparticles Fe_3O_4 by chemical modification method. A kind of Fe_3O_4 catalyst Fe_3O_4@SiO_2-IL, supported by magnetic particles was prepared and used to catalyze the hydrolysis of cellulose by Fe_3O_4@SiO_2-IL. The catalysts were characterized by FT-IR and TEM. The effects of reaction temperature, reaction time, amount of catalyst and amount of water on the yield of cellulose hydrolysis reduction sugar. Tem analysis shows that the particle size of the magnetic core is about 250 nm, and the surface of the magnetic particle modified by ionic liquid has no obvious change. When the amount of cellulose was 0.1 g, the amount of ionic liquid 1-Ding Ji -3-methylimidazolium chloride ([Bmim] Cl) was 2.0 g, the amount of magnetic catalyst was 0.2 g, the amount of water was 0.2 g, the reaction temperature was 100 鈩，

本文編號(hào)：2256693