Method for preparing micron spherical mesoporous silicon dioxide
A mesoporous silica, spherical technology, applied in the direction of silicon oxide, etc., can solve the problem of low yield and achieve a wide range of effects
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[0020] Example 1
[0021] (1) Prepare hydrochloric acid solution, the concentration of hydrochloric acid is 2.0 mol / L.
[0022] (2) Prepare a solution of surfactant, add surfactant to step (1), so that the concentration of cetyltrimethylammonium bromide in the mixed solution is 0.05 mol / L; the concentration of polyvinyl alcohol is 8.0 G / L; the concentration of poly(oxyethylene)-poly(oxypropylene)-poly(oxyethylene) is 3.5×10 -4 Moles / liter.
[0023] (3) Add ethyl orthosilicate to the mixed solution obtained in step (2) so that the concentration of the mixed ethyl orthosilicate is 0.50 mol / L, continue to stir for 7 minutes, and then stand for a period of time to obtain white The precipitated solution is centrifuged, washed, dried, and calcined at 600°C to obtain mesoporous silica with an average particle size of 1.3μm and a specific surface area of 860m 2 / g, the mesopore size is 4.4nm.
Example Embodiment
[0024] Example 2
[0025] (1) Prepare nitric acid solution, the concentration of nitric acid is 6.0 mol / L.
[0026] (2) Prepare a solution of surfactant, add surfactant in (1), so that the concentration of cetyltrimethylammonium chloride in the solution after mixing and dissolution is 0.040 mol / L; the concentration of polyvinyl alcohol 6.0 g / L; the concentration of poly(oxyethylene)-poly(oxypropylene)-poly(oxyethylene) is 6×10 -4 Moles / liter.
[0027] (3) Add ethyl orthosilicate to the mixed solution obtained in step (2) so that the concentration of the mixed methyl orthosilicate is 4.0 mol / L, continue to stir for 15 minutes, and then stand for a period of time to obtain white The precipitated solution is centrifuged, washed, dried, and calcined at 550°C to obtain mesoporous silica with an average particle size of 2.1μm and a specific surface area of 920m 2 / g, the mesopore size is 2.7nm.
Example Embodiment
[0028] Example 3
[0029] As in Example 1, the hydrochloric acid in step (1) was changed to sulfuric acid, and other conditions were unchanged to obtain mesoporous silica with an average particle size of 3.1 μm and a specific surface area of 1090 m 2 / g, the mesopore size is 2.3nm.
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