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A method for synthesizing highly active ts-1 molecular sieves using high-impurity silicon raw materials

A silicon raw material, high activity technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of complex process, low catalytic activity and high synthesis cost

Active Publication Date: 2017-12-15
ZHENGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention provides a method for synthesizing high-activity TS-1 molecular sieves by using high-impurity silicon raw materials, which solves the problems of high synthesis cost, complicated process and low catalytic activity of existing TS-1 molecular sieves.

Method used

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  • A method for synthesizing highly active ts-1 molecular sieves using high-impurity silicon raw materials
  • A method for synthesizing highly active ts-1 molecular sieves using high-impurity silicon raw materials
  • A method for synthesizing highly active ts-1 molecular sieves using high-impurity silicon raw materials

Examples

Experimental program
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Effect test

Embodiment 1

[0022] First mix 4.36 parts of ethanolamine with 0.61 parts of hydrogen peroxide, and oxidize ethanolamine at 80°C to form ethanolamine oxide, then use ethanolamine oxide as a system stabilizer, and then in parts by weight: 28 parts of silicon source, 4.09 parts of butyl titanate, four The ratio of 36.7 parts of propylammonium bromide, 0.61 part of ethanolamine oxide and 540 parts of water, the fumed silica A, butyl titanate, Mix tetrapropylammonium bromide and water to prepare a precursor solution, put it into a hydrothermal reaction kettle, crystallize at 175°C for 96 hours, dry at 120°C for 12 hours after centrifugation, and roast in air at 550°C for 7 hours to obtain TS-1 molecular sieve.

[0023] figure 1 It is the XRD characterization result of the TS-1 molecular sieve in Example 1. It can be seen from the XRD that the product has a typical MFI type zeolite molecular sieve structure and has a high degree of crystallinity.

[0024] figure 2 , 3 Respectively, the ultra...

Embodiment 2

[0037] The silicon source is Xinzheng Yongfa silica sol B with a molybdenum content of 0.006%, and the others are the same as in Example 1.

[0038] The obtained TS-1 molecular sieve is used in the propylene epoxidation reaction, the yield of propylene oxide is 78.0%, the conversion rate of hydrogen peroxide is 79.5%, the selectivity of propylene oxide is 98.1%, and the effective utilization of hydrogen peroxide is 100%.

Embodiment 3

[0040] The silicon source is Xinzheng Yongfa silica sol C with a sodium content of 0.202%, and the others are the same as in Example 1.

[0041] The obtained TS-1 molecular sieve is used in the propylene epoxidation reaction, the yield of propylene oxide is 80.8%, the conversion rate of hydrogen peroxide is 81.2%, the selectivity of propylene oxide is 99.5%, and the effective utilization of hydrogen peroxide is 100%.

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Abstract

The invention relates to a method for synthesizing high-activity TS-1 molecular sieves by using high-impurity silicon raw materials, comprising the following steps: using alcohol amine oxide as a titanium complexing agent, adding it to cheap silicon sources containing different amounts of heteroatoms, titanium In the mixed solution of butyl ester and tetrapropylammonium bromide, the TS-1 molecular sieve with high catalytic performance is synthesized by hydrothermal method, and the alcohol amine oxide is the yellow-brown oxidation formed by alcohol amine and hydrogen peroxide at high temperature. degraded mixture. The TS-1 molecular sieve of the present invention can use cheap low-purity silicon raw materials containing a large amount of impurities to replace high-purity silicon raw materials, which greatly reduces the requirements for raw materials and technological processes and production costs, and can be used within a relatively large range of impurity content. The catalytic performance of the molecular sieve to the propylene epoxidation reaction is guaranteed, and even the catalytic performance of the molecular sieve can be improved with the increase of the content of impurities in the silicon raw material.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, and in particular relates to a method for synthesizing high-activity TS-1 molecular sieves by using high-impurity silicon raw materials. Background technique [0002] The application of TS-1 to propylene epoxidation reaction is a reaction with outstanding advantages such as mild reaction conditions, good atom economy, and no pollution to the environment. It overcomes the disadvantages of severe corrosion of equipment in the chlorohydrin method, excessive waste liquid and waste residue, etc., and there is no shortage of co-products in the co-oxidation method. After the reaction, only propylene oxide and water are produced. The product yield is high, the process flow is simple, and it is clean. Pollution-free, it is an internationally recognized environment-friendly production technology. The traditional TS-1 molecular sieve uses ethyl silicate (TEOS) as the silicon source, butyl titanate (TBOT...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/89
Inventor 王向宇黄晓艳温贻强李保军刘猛刘杨青
Owner ZHENGZHOU UNIV
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