Department of Polymer Science and Engineering, Hebei University of Technology, Tianjin 300130, P.R. China.
Sci Rep. 2017 Mar 16;7:44178. doi: 10.1038/srep44178.
Owing to their unique structural and surface properties, mesoporous microspheres are widely applied in the catalytic field. Generally, increasing the surface area of the specific active phase of the catalyst is a good method, which can achieve a higher catalytic activity through the fabrication of the corresponding catalytic microspheres with the smaller size and hollow structure. However, one of the major challenges in the use of hollow microspheres (microcapsules) as catalysts is their chemical and structural stability. Herein, the grape-like hypercrosslinked polystyrene hierarchical porous interlocked microcapsule (HPIM-HCL-PS) is fabricated by SiO colloidal crystals templates, whose structure is the combination of open mouthed structure, mesoporous nanostructure and interlocked architecture. Numerous microcapsules assembling together and forming the roughly grape-like microcapsule aggregates can enhance the structural stability and recyclability of these microcapsules. After undergoing the sulfonation, the sulfonated HPIM-HCL-PS is served as recyclable acid catalyst for condensation reaction between benzaldehyde and ethylene glycol (TOF = 793 h), moreover, exhibits superior activity, selectivity and recyclability.
由于介孔微球具有独特的结构和表面性能，因此被广泛应用于催化领域。通常，增加催化剂特定活性相的表面积是一种很好的方法，通过制备具有更小尺寸和空心结构的相应催化微球，可以实现更高的催化活性。然而，将空心微球（微胶囊）用作催化剂的主要挑战之一是其化学和结构稳定性。在此，通过 SiO2 胶体晶体模板制备了类葡萄状超交联聚苯乙烯分级多孔互锁微胶囊（HPIM-HCL-PS），其结构是开口结构、介孔纳米结构和互锁结构的结合。大量微胶囊组装在一起形成大致类葡萄状的微胶囊聚集体，可以增强这些微胶囊的结构稳定性和可回收性。经过磺化反应后，磺化 HPIM-HCL-PS 可用作苯甲醛和乙二醇之间缩合反应的可回收酸催化剂（TOF=793 h），并且表现出更高的活性、选择性和可回收性。
