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Method for synthesizing TS-2 molecular sieves

A TS-2, molecular sieve technology, applied in the field of chemical engineering, can solve the problems of complex gel preparation process and not widely used

Inactive Publication Date: 2011-03-30
邓宇辰
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Problems solved by technology

This method can reduce the amount of template agent TBAOH, but the whole gel preparation process is quite complicated and has not been widely used

Method used

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Embodiment Construction

[0007] The method adopted in the present invention is: take tetrabutyl titanate (TBOT), put it into the dripping tube and add it dropwise into the flask containing it; in alcohol (IPA); under the condition of vigorous stirring, the above-mentioned mixed solution was slowly dripped in the three-necked flask; h 2 o 2 ) / n(Ti) ratio by adding H 2 o 2 , to obtain a light yellow solution; to remove alcohol by heating in a water bath to obtain a clear glue.

[0008] Add a small amount of H 2 o 2 The prepared TS-2 molecular sieve has good catalytic activity, and when it is used for the epoxidation of propylene to prepare propylene oxide, H 2 o 2 The conversion rate of 94.4%, H 2 o 2 The selectivity to propylene oxide was 97.7%. h 2 o 2 The order of addition has little effect on the performance of molecular sieves.

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Abstract

The invention relates to a method for synthesizing TS-2 molecular sieves, in particular to a method for synthesizing the TS-2 molecular sieves under the condition of adding H2O2, which belongs to the technical field of chemical engineering. The method for synthesizing the TS-2 molecular sieves has the advantages of simple operation and high framework titanium content and can effectively avoid the formation of anatase TiO2. The method comprises the following steps of: placing tetraethoxysilane (TEOS) into a dripping tube, dripping the TEOS into a flask, and properly accelerating the stirring speed; adding tetrabutyl orthotitanate (TBOT) into anhydrous isopropyl alcohol (IPA); slowly dripping the mixed liquid into a three-neck flask under the condition of severe stirring; adding 10 percent (wt) of TBAOH template agents into the three-neck flask after the dripping is completed, and adding H2O2 according to a certain n(H2O2) / n(Ti) ratio to obtain light yellow solution; and carrying out heating and alcohol removal through water baths to obtain clear glue solution.

Description

Technical field: [0001] The invention belongs to the technical field of chemical engineering, more specifically, relates to a 2 o 2 Under the same conditions, the method of synthesizing TS-2 molecular sieve; this method is simple to operate, has a high content of framework titanium, and can effectively avoid anatase TiO 2 form. Background technique: [0002] TS-2 molecular sieve has MEL topological structure, and has good catalytic oxidation performance like TS-1. High catalytic activity. In 1990, Reddy et al. used orthoethyl silicate (TEOS), tetrabutyl titanate (TBOT) and tetrabutylammonium hydroxide (TBAOH) as raw materials to synthesize TS-2 by hydrothermal crystallization method. During the hydrolysis process, TiO2 should be strictly prevented 2 The generation of precipitation. Because the template agent TBAOH is expensive, Tuel et al. used tetrabutylphosphine hydroxide (TBPOH) as the template agent to synthesize TS-2. Uguina et al. proposed a new synthesis method...

Claims

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Application Information

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IPC IPC(8): C01B39/08
Inventor 邓宇辰
Owner 邓宇辰
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