介孔空心碳球限域酸碱液滴促进水-油两相反应研究  

Acid or Alkali droplets Confined in Mesoporous Hollow Carbon Nanospheres for Improving Water-Oil Biphasic Reactions

作　　者：张天宇 张晓明[1] 关茹群 郝雅娟[1] 杨恒权[1] ZHANG Tianyu;ZHANG Xiaoming;GUAN Ruqun;HAO Yajuan;YANG Hengquan(School of Chemistry and Chemical Engineering,Shanxi University,Taiyuan 030006,China)

机构地区：[1]山西大学化学化工学院,山西太原030006

出　　处：《山西大学学报（自然科学版）》2021年第2期327-334,共8页Journal of Shanxi University(Natural Science Edition)

基　　金：国家自然科学基金(21603128)。

摘　　要：以介孔空心碳球为载体,采用等体积浸渍法将酸和碱的液滴限域在其纳米空腔内,制备了具有较大反应界面的固体酸/碱催化剂,并用于水-油两相反应体系。通过TEM、SEM、N2吸附等测试表明所得到的空心碳球尺寸均匀、可调(280 nm~510 nm),且具有较高的比表面积(797 m^(2)/g~1305 m^(2)/g)和较大的介孔孔径(6 nm~10 nm)。限域酸/碱后的催化剂在硫酸催化醇的加成反应和碱催化醛的缩合反应中,均表现出远高于传统介孔SBA-15负载催化剂和Pickering乳液体系的反应活性(如酸催化:TOF 689 vs 228,32 h^(-1))。此外,该限域型催化剂也可用于连续流动反应,在连续反应500 h后催化活性未见明显降低,表明所制备的催化剂在水油两相反应中具有较高的稳定性。A solid acid/alkali catalyst with large reaction interface was prepared by using mesoporous hollow carbon nanospheres as a matrix for water-oil biphasic reaction system, in which acids and alkalis droplets were confined within the nanocavities by an equal volume impregnation method.Various characterization techniques such as TEM, SEM, and N2 adsorption had proved that the obtained hollow carbon spheres possess uniform morphology, tunable size(280 nm-510 nm), high specific surface area(797 m^(2)/g-1305 m^(2)/g) and large mesoporous diameter(6 nm-10 nm).After confining with acid/alkalis, the yielded catalyst showed much higher activity than those catalysts prepared from SBA-15 and Pickering emulsion catalytic system in the acid-catalyzed alcohol addition reactions and alkali-catalyzed aldehyde condensation reactions(such as acid catalysis: TOF 689 vs 228, 32 h^(-1)).In addition,the confined solid catalyst can also be used for continuous flow reactions, and the catalytic activity does not decrease obviously over 500 h, indicating that the prepared catalyst has high stability in water-oil biphasic systems.

关 键 词：水-油两相反应 介孔空心碳球 限域 连续流动反应 

分 类 号：O613[理学—无机化学]