Heteroatom-containing molecular sieve and modification method and application thereof
A heteroatom molecular sieve and molecular sieve technology, applied in molecular sieve catalysts, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of waste of template agents, harsh conditions, insufficient utilization of template agents, etc., and achieve good effects and simple processes. , the effect of easy implementation
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preparation example 1
[0053] This preparation example is used to prepare TS-1 molecular sieve containing template agent.
[0054] About 3 / 4 of the tetrapropylammonium hydroxide (TPAOH, 20wt%) solution was added to the tetraethyl orthosilicate (TEOS) solution to obtain a liquid mixture with a pH of about 13, and then to the The required amount of n-butyl titanate [Ti(OBu) was added dropwise to the obtained liquid mixture 4 ] in anhydrous isopropanol and stirred for 15 minutes. Finally, the remaining TPAOH was slowly added to the mixture and stirred at 348-353K for about 3 hours to obtain a chemical composition of 0.02TiO 2 : SiO 2 :0.36TPA:35H 2 The sol of O was then crystallized at 443K for 3 days, and then the obtained solid was filtered, washed with distilled water, and dried at 373K for 5 hours to obtain a molecular sieve sample, numbered TS-1-A.
[0055] The weight loss of TS-1-A measured between 200-600° C. by thermogravimetric method is 15%.
preparation example 2
[0057] This preparation example is used to prepare TS-1 molecular sieve containing template agent.
[0058] The difference from Preparation Example 1 is that the obtained chemical composition is 0.008TiO 2 : SiO 2 :0.36TPA:35H 2 The sol of O, the molecular sieve sample number is TS-1-B.
[0059] The weight loss of TS-1-B at 200-600° C. was measured to be 12% by thermogravimetric method.
preparation example 3
[0061] This preparation example is used to prepare a Sn-MFI molecular sieve containing a template agent.
[0062] About 3 / 4 of the tetrapropylammonium hydroxide (TPAOH, 20wt%) solution was added to the tetraethyl orthosilicate (TEOS) solution to obtain a liquid mixture with a pH of about 13, and then to the The required amount of SnCl was added dropwise to the resulting liquid mixture 4 ·5H 2 O, stirred for 15 minutes. Finally, the remaining TPAOH was slowly added to the mixture and stirred at 348-353K for about 3 hours to obtain a chemical composition of 0.02SnO 2 : SiO 2 :0.36TPA:35H 2 The sol of O was then crystallized at 443K for 3 days, and then the obtained solid was filtered, washed with distilled water, and dried at 373K for 5 hours to obtain a molecular sieve sample, numbered Sn-MFI-A.
[0063] The weight loss of Sn-MFI-A at 200-600° C. was measured to be 13% by thermogravimetric method.
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