MFI topological structure silicon molecular sieve as well as preparation method and application thereof
A technology of silicon molecular sieve and molecular sieve, which is applied in the field of MFI topological structure silicon molecular sieve and its preparation, can solve the problems of high content of amorphous silicon oxide, poor relative crystallinity, large crystal particles, etc., achieve good catalytic performance and improve conversion rate , Improve the effect of economy
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[0037]The second aspect of the present invention provides a method for preparing a silicon molecular sieve with an MFI topology structure, the method comprising:
[0038](1) Mix the silicon source, organic amine, organic template, metal source, organic alcohol and water to obtain a colloidal mixture, wherein the molar ratio of silicon source, organic amine, organic template, organic alcohol and water is 1:(0.05 -0.5): (0.05-0.5): (4-20): (5-100), the amount-mass ratio of silicon source to metal source is (10000-200000):1, silicon source is SiO2Calculated, the metal source is calculated as the metal element;
[0039](2) The colloidal mixture is subjected to two-stage temperature-changing alcohol-hydrothermal system crystallization, and the conditions for the two-stage temperature-changing alcohol-hydrothermal system crystallization include: crystallization at 40-70°C for 0.5-5 days, then Crystallize at 80-130℃ for 0.5-5 days;
[0040](3) filtering, drying and roasting the crystallization moth...
Example Embodiment
[0053]According to a specific embodiment of the present invention, the first mixing is performed under stirring conditions, and the stirring time is not particularly limited, as long as the ethanol, organic amine and organic template are mixed uniformly. Specifically, the method may further include, after adding the metal source and water, stirring, and then adding the ethyl orthosilicate.
Example Embodiment
[0054]According to a specific embodiment of the present invention, the method may further include: after adding ethyl orthosilicate, stirring to obtain the colloidal mixture. In the present invention, there is no particular limitation on the stirring conditions, as long as the colloidal mixture can be obtained. For example, it can be stirred at room temperature (25°C) for 2-6 hours.
[0055]According to another preferred embodiment of the present invention, the silicon source is methyl orthosilicate, and the organic alcohol is methanol. The inventor of the present invention discovered during the research that the combined use of methyl orthosilicate as a silicon source and methanol as an organic alcohol is more conducive to further improving the catalytic performance of the prepared molecular sieve. Preferably, the mixing in step (1) includes: performing a second mixing of methanol, organic amine and organic template, then adding the metal source and water, and then adding methyl ortho...
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