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 who...

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[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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