Beilstein J. Nanotechnol.2011,2, 785–801, doi:10.3762/bjnano.2.87
mesoporousmaterials with intrinsic zeolitic features. These materials are thought to be superior, because they are able to combine (i) the enhanced diffusion and accessibility for larger molecules and viscous fluids typical of mesoporousmaterials with (ii) the remarkable stability, catalytic activity and
selectivity of zeolites. This review gives an overview of the state of the art concerning combined zeolitic/mesoporousmaterials. Focus is put on the synthesis and the applications of the combined zeolitic/mesoporousmaterials. The different synthesis approaches and formation mechanisms leading to these
materials are comprehensively discussed and compared. Moreover, Ti-containing nanoporous materials as redox catalysts are discussed to illustrate a potential implementation of combined zeolitic/mesoporousmaterials.
Keywords: catalysis; characterization; combined zeolitic/mesoporousmaterials; synthesis
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Figure 1:
Different degrees and types of hierarchy can be defined in porous materials [48]. Reproduced by permiss...
Beilstein J. Nanotechnol.2011,2, 486–498, doi:10.3762/bjnano.2.52
solvent (N,N-dimethylformamide, 1,1,3,3-tetramethylurea, 1,3-dimethyl-2-imidazolidinone) or a protic solvent that can form hydrogen bonds, such as water, was used.
Keywords: inorganic–organic hybrid materials; mesoporousmaterials; nucleophilic substitution; silica; sol–gel chemistry; Introduction
mesoporousmaterials, whose syntheses are based on block copolymers such ethylene oxide (EO)x–propylene oxide (PO)y–ethylene oxide (EO)x, this can be achieved by variation of the length of the EO or PO blocks, by increasing the synthesis temperature or by the addition of inorganic salts [6][9][13]. Currently
alkaline solutions and hydrothermal conditions, from amorphous mesoporousmaterials to well-organized mesoporous structures [22][23].
Many silica gels are functionalized by organic groups specific for their eventual applications. Typical examples are the hydrophobization with methyl or phenyl groups, and
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Figure 1:
Schematic description of the nucleophilic substitution reaction for chloromethyl-modified silica po...