| 초록 |
Hierarchical pore systems (HPS) are defined by the different porosity levels in two or multiple length scales. HPS are naturally or artificially designed for accommodation of maximum functions in a limited volume or area, and also achievement of their maximum efficiencies (e.g., mass transfer or transportation). In particular, hierarchically mesoporous/microporous materials (HMM) are composed by two levels of porosities corresponding to the mesoporous range (2-50 nm) and microporous range (＜ 2-50 nm), respectively. In the present lecture, recent progresses in our laboratory on synthesis, characterization and applications of HMM are reviewed. A particular attention is given to the direct, hydrothermal crystallization of meso-/microporous HMM zeolites, for which we have developed a hydrothermally self-assembling route to hierarchical zeolites with various structures, using organosilane surfactants as a mesopore-generating agent. Various zeolites such as MFI, BEA and LTA have been successfully synthesized with a narrow distribution of mesopore diameters. |
