Abstract
Super-microporous material (pore size 1–2 nm) can bridge the pore size gap between the zeolites (<1 nm) and the mesoporous oxides (>2 nm). A series of super-microporous titania–alumina materials has been successfully prepared via a facile one-pot evaporation-induced self-assembly (EISA) strategy by different solvents using fatty alcohol polyoxyethylene ether (AEO-7) as the template. Moreover, no extra acid or base is added in our synthesis process. When titanium isopropylate is used as the titanium source, these materials exhibit high BET surface areas (from 275 to 396 m2/g) and pore volumes (from 0.14 to 0.18 cm3/g). The sample prepared using methanol as the solvent shows the largest Brunauer–Emmett–Teller (BET) surface area of 396 m2/g. When tetrabutyl titanate is used as the titanium source, these materials exhibit high BET surface areas (from 282 to 396 m2/g) and pore volumes (from 0.13 to 0.18 cm3/g). The sample prepared using ethanol as the solvent shows the largest BET surface area of 396 m2/g.
Highlights
Porous materials have received considerable attention owing to their ability to interact with atoms, ions, molecules, and nanoparticles at their surfaces, but throughout the bulk of the materials [1]
The as-prepared super-microporous titania–alumina samples were labeled, starting with a prefix of MTA followed by the type of solvent (M, E, B, IB, and O, which refer to methanol, ethanol, 1-butanol, isobutanol, and 1-octanol, respectively), titanium precursors (i and b, which refer to titanium isopropoxide and tetrabutyl titanate), and calcination temperature
MTA-M-i-400 refers to super-microporous titania–alumina prepared from titanium isopropoxide with methanol solvent calcined at 400 ◦ C for 5 h
Summary
Porous materials have received considerable attention owing to their ability to interact with atoms, ions, molecules, and nanoparticles at their surfaces, but throughout the bulk of the materials [1]. The presence of pores in nanostructured materials greatly promotes their physical and chemical properties Among these non-siliceous oxides, TiO2 –Al2 O3 is of interest for many applications in wide fields, such as catalysis [2,3,4,5], ceramic [6,7], gas sensor [8], solar cells [9,10], and others [11]. Mixed titania–alumina oxides exhibit properties superior to those of single-metal oxides (alumina or titania) Such a mixture may broaden the range of applications available to this hybrid material. Materials 2020, 13, 1126 preparation of super-microporous (pore size 1–2 nm) titania–alumina mixed oxides. The materials in this pore size range could bridge the pore size gap between the zeolites (2nm). By varying the solvent used among methanol, ethanol, 1-butanol, isobutanol, or 1-octanol, we successfully obtained titania–alumina materials with tailored framework properties
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