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

240648

Sigma-Aldrich

Cyclohexylamine, ReagentPlus^®, ≥99.9%

433705

Sigma-Aldrich

Aluminum, evaporation slug, diam. × L 6.3 mm × 6.3 mm, 99.999% trace metals basis

326887

Sigma-Aldrich

Aluminum, wire, diam. 0.58 mm, ≥99.99% trace metals basis

94098

Sigma-Aldrich

Drying pearls orange

GF65371327

Aluminum, wire reel, 50m, diameter 0.5mm, as drawn, 99.5%

GF58771301

Aluminum, honeycomb, 600x600mm, thickness 5mm, cell size 13mm, cell wall 0.1mm, core density 0.062g/cm³, phenolic adhesive (resin), 99.5%

GF24569602

Aluminum, foam, 150x150mm, thickness 30mm, bulk density 0.2g/cm³, porosity 0.93, aluminum 6101 grade, 98.5%

GF26773230

Aluminum, honeycomb, 300x300mm, thickness 13.9mm, cell size 6.3mm, cell wall 0.064mm, core density 0.083g/cm³, phenolic adhesive (resin), facing skin aluminum 0.55mm, 99.9%

GF37306267

Aluminum, foam, 150x150mm, thickness 6.35mm, bulk density 0.2g/cm³, porosity 0.93, 2 pores/cm, aluminum 6101 grade, 98.5%

GF10029596

Aluminum, foam, 150x150mm, thickness 6.35mm, bulk density 0.2g/cm³, porosity 0.93, 8 pores/cm, aluminum 6101 grade, 98.5%

GF23840221

Aluminum, honeycomb, 300x300mm, thickness 26.5mm, cell size 6.3mm, cell wall 0.064mm, core density 0.083g/cm³, phenolic adhesive (resin), facing skin aluminum 0.55mm, 99.9%

GF33400224

Aluminum, honeycomb, 600x600mm, 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%

GF31987525

Aluminum, honeycomb, 300x300mm, thickness 10mm, cell size 6.3mm, cell wall 0.064mm, core density 0.083g/cm³, phenolic adhesive (resin), 99.5%

GF63970498

Aluminum, honeycomb, 300x300mm, thickness 26.5mm, cell size 6.3mm, cell wall 0.064mm, core density 0.083g/cm³, phenolic adhesive (resin), facing skin carbon fiber / epoxy, 99.9%

GF19760081

Aluminum, honeycomb, 600x600mm, thickness 5mm, cell size 3.2mm, cell wall 0.025mm, core density 0.072g/cm³, phenolic adhesive (resin), 99.5%

GF06197014

Aluminum, rod, 200mm, diameter 10.0mm, as drawn, 99.999%

GF27426944

Aluminum, insulated wire, 2m, conductor diameter 0.1mm, insulation thickness 0.005mm, polyimide insulation, 99.95+%

GF49694743

Aluminum, tube, 100mm, outside diameter 0.6mm, inside diameter 0.3mm, wall thickness 0.15mm, as drawn, 99.5%

GF21896039

Aluminum, rod, 200mm, diameter 12.0mm, as drawn, 99.999%

GF62984346

Aluminum, tube, 2m coil, as drawn, outside diameter 0.30mm, inside diameter 0.2mm, wall thickness 0.05mm, 99.5%

GF12712610

Aluminum, sphere, 100pcs, diameter 6.0mm, 99%

GF10105524

Aluminum, microleaf disks, 25mm, thinness 0.25μm, specific density 68.8μg/cm², removable support, 99.999%

GF36470178

Aluminum, honeycomb, 300x300mm, thickness 5mm, cell size 13mm, cell wall 0.1mm, core density 0.062g/cm³, phenolic adhesive (resin), 99.5%

GF03467202

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%

GF19654803

Aluminum, rod, 200mm, diameter 5.0mm, as drawn, 99.999%

GF18607473

Aluminum, tube, 1000mm, outside diameter 0.55mm, inside diameter 0.4mm, wall thickness 0.075mm, as drawn, 99.5%

GF20784360

Aluminum, sphere, 100pcs, diameter 2.5mm, aluminum alloy 2017 precision sphere, grade 200, 95.2%

GF28125390

Aluminum, tube, 200mm, outside diameter 0.30mm, inside diameter 0.2mm, wall thickness 0.05mm, as drawn, 99.5%

GF01863097

Aluminum, wire reel, 5m, diameter 0.05mm, as drawn, 99.99+%

GF11053606

Aluminum, wire reel, 5m, diameter 0.30mm, as drawn, 99.5%