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  • Ordered hexagonal mesoporous aluminosilicates with low Si/Al ratio: synthesis, characterization, and catalytic application.

Ordered hexagonal mesoporous aluminosilicates with low Si/Al ratio: synthesis, characterization, and catalytic application.

Journal of nanoscience and nanotechnology (2014-04-18)
Aifeng Liu, Hongwei Che, Chuanzhi Liu, Quanrong Fu, Ruijiao Jiang, Cheng Wang, Liang Wang
ABSTRACT

Ordered hexagonal mesoporous aluminosilicates with lower Si/Al ratio below 5 have been successfully synthesized via the co-assembly of preformed aluminosilicate precursors with Gemini surfactant [C12H25N+(CH3)2(CH2)6N+(CH3)2C12H25] x 2Br(-) as the template. Powder X-ray diffraction, transmission electron microscopy, scanning electron microscopy, N2 adsorption-desorption isotherm measurements, Fourier transform infrared spectroscopy, 27Al nuclear magnetic resonance, thermogravimetric analysis, and temperature-programmed desorption of cyclohexylamine are employed to characterize the resulting samples. The phenol alkylation reaction is carried out to evaluate their catalytic performances. These studies indicate that the sample with a low Si/Al ratio of 3 still retains a highly ordered hexagonal mesoporous structure. And it also possesses the highest acidity of 0.96 mmol among the samples with lower Si/Al ratios below 5 due to its higher specific surface area together with more content of tetrahedrally coordinated Al in the framework. The catalytic tests confirm that the acidity of the samples plays a key role in determining their catalytic performances.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Aluminum, wire, diam. 0.58 mm, ≥99.99% trace metals basis
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Aluminum, pellets, 3-8 mesh, ≥99.999% trace metals basis
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Aluminum, wire, diam. 1.0 mm, 99.999% trace metals basis
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Aluminum, granular, <1 mm, 99.7% trace metals basis
Aluminum, IRMM®, certified reference material, 1.0 mm wire
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Drying pearls orange
Aluminum, IRMM®, certified reference material, 1.0 mm foil
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Aluminum, powder, ≥91% (complexometric)
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Aluminum, evaporation slug, diam. × L 6.3 mm × 6.3 mm, 99.999% trace metals basis
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Cyclohexylamine, ReagentPlus®, ≥99.9%
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Aluminum, foil, thickness 8 μm, 99% trace metals basis
Aluminum, wire reel, 1000m, diameter 0.30mm, as drawn, 99.5%
Aluminum, wire reel, 100m, diameter 0.063mm, annealed, 99.99%
Aluminum, honeycomb, 600x600mm, thickness 5mm, cell size 3.2mm, cell wall 0.025mm, core density 0.072g/cm3, phenolic adhesive (resin), 99.5%
Aluminum, foam, 150x150mm, thickness 30mm, bulk density 0.2g/cm3, porosity 0.93, aluminum 6101 grade, 98.5%
Aluminum, honeycomb, 600x600mm, thickness 20mm, cell size 3.2mm, cell wall 0.025mm, core density 0.072g/cm3, phenolic adhesive (resin), 99.5%
Aluminum, honeycomb, 300x300mm, thickness 10mm, cell size 6.3mm, cell wall 0.064mm, core density 0.083g/cm3, phenolic adhesive (resin), 99.5%
Aluminum, honeycomb, 300x300mm, thickness 52.3mm, cell size 6.3mm, cell wall 0.064mm, core density 0.083g/cm3, phenolic adhesive (resin), facing skin glass fiber 0.75mm, 99.9%
Aluminum, wire reel, 50m, diameter 1.0mm, as drawn, 99.95+%
Aluminum, wire reel, 20m, diameter 1.5mm, as drawn, 99.999%
Aluminum, wire reel, 50m, diameter 1.0mm, as drawn, 99.999%
Aluminum, wire reel, 10m, diameter 0.125mm, as drawn, 99.5%
Aluminum, wire reel, 500m, diameter 0.25mm, as drawn, 99.5%
Aluminum, wire reel, 20m, diameter 0.063mm, annealed, 99.99%
Aluminum, wire reel, 1m, diameter 0.125mm, as drawn, 99.99+%
Aluminum, wire reel, 5m, diameter 1.5mm, as drawn, 99.999%
Aluminum, wire reel, 50m, diameter 0.063mm, annealed, 99.99%
Aluminum, wire reel, 20m, diameter 0.02mm, hard, 99.99%
Aluminum, wire reel, 5m, diameter 2.0mm, as drawn, 99.999%