A macroporous-mesoporous ordered magnesium-aluminum composite oxide material and its preparation method
A mesoporous ordered, aluminum composite technology, applied in the preparation of alumina/hydroxide, the preparation of liquid hydrocarbon mixtures, chemical instruments and methods, etc. , poor base catalytic conversion activity, etc., to achieve the effect of high catalytic reaction activity, simple and easy process, and high thermal stability
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Embodiment 1
[0038] Under strong stirring at 30°C, add 0.4g citric acid and 3.2g EO to 20mL absolute ethanol solution containing 1.5g 6M nitric acid 106 PO 70 EO 106 , 0.51g of magnesium nitrate hexahydrate and 3.27g of aluminum isopropoxide were completely dissolved to obtain a clear solution; the resulting clear solution was poured into a sealed autoclave for solvothermal pretreatment at 80°C for 24 hours; subsequently, the resulting reaction solution was poured 0.7 g of polystyrene microspheres with a particle diameter of 200 nm were added to a petri dish, and after ultrasonication at 25 °C for 1 h, the solvent was volatilized at 60 °C for 24 h in an open state; finally, the obtained solid sample was roasted at 550 °C for 5 h, In addition to organic templates existing in mesoporous channels and polystyrene microspheres with macroporous structures, magnesium-aluminum composite oxides with highly ordered two-dimensional hexagonal mesoporous structures and network-like three-dimensional o...
Embodiment 2
[0047] Under vigorous stirring at 35°C, add 0.6 g of glacial acetic acid and 3.5 g of EO to 20 mL of absolute ethanol solution containing 1.8 g of 6M hydrochloric acid 106 PO 70 EO 106 , 1.0g magnesium nitrate hexahydrate and 3.95g aluminum tert-butoxide were completely dissolved to obtain a clear solution; the resulting clear solution was poured into a sealed high-pressure reactor, and solvothermal pretreatment was performed at 100°C for 24 hours; subsequently, the resulting reaction solution was poured into 0.7 g of polystyrene microspheres with a particle size of 200 nm were added to a petri dish, and after ultrasonication at 35 °C for 1 h, the solvent was volatilized at 60 °C for 24 h in an open state; finally, the obtained solid sample was roasted at 650 °C for 5 h, The magnesium-aluminum composite oxide sample is obtained by removing the organic template agent existing in the mesoporous channel and the polystyrene microspheres that produce a macroporous structure.
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Embodiment 3
[0052] Under strong stirring at 40°C, add 0.4g oxalic acid and 2.0g EO to 20mL absolute ethanol solution containing 1.0g 6M nitric acid 20 PO 70 EO 20 , 0.1g of magnesium oxide and 6.0g of aluminum nitrate were completely dissolved to obtain a clear solution; the resulting clear solution was poured into a sealed autoclave, and solvothermal pretreatment was performed at 120°C for 24 hours; then, the resulting reaction solution was poured into a petri dish , adding 0.7g of polystyrene microspheres with a particle size of 300nm, ultrasonication at 40°C for 1h, and solvent volatilization at 80°C for 24h in an open state; finally, the obtained solid sample was roasted at 650°C for 5h to remove the The organic template agent in the pore channel and the polystyrene microspheres with macroporous structure were used to obtain the magnesium-aluminum composite oxide sample.
[0053] The XRD, SEM and nitrogen adsorption characterization results confirmed that the obtained magnesium-alum...
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