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Process for preparing titanium-silicon molecular sieve/nano-carbon fiber fiber composite catalyst

A technology of titanium-silicon molecular sieve and nano-carbon fiber, which is applied in the direction of molecular sieve catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., to achieve the effects of improved filtration performance, simple preparation process, and wide application range

Inactive Publication Date: 2008-06-18
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, no one has directly mixed TS-1 powder and CNF to prepare composite catalysts to solve the liquid phase dispersion and separation problems of TS-1 industrial applications.

Method used

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  • Process for preparing titanium-silicon molecular sieve/nano-carbon fiber fiber composite catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 1 g of TS-1 for industrial use, 1 g of CNF and 50 ml of distilled water into a 150 ml three-necked flask, and stir at 500 rpm for 24 hours to obtain a mixture.

[0028] Filter the mixture and dry it at 120°C for 12 hours to obtain the mixed TS-1 / CNF composite catalyst of the present invention, which is ready for use.

[0029] Wherein: the weight percent of the titanium silicon molecular sieve TS-1 is 50.0%, and the carbon nanofiber is 50.0%. The particle size of the titanium-silicon molecular sieve is less than or equal to 150nm, and the particle size range of the composite catalyst is 5-50 μm. The scanning electron microscope photo is shown in Figure 1.

Embodiment 2

[0031] Add 1 g of TS-1 for industrial use, 4 g of CNF and 50 ml of distilled water into a 150 ml three-necked flask, and stir at 500 rpm for 24 hours to obtain a mixture.

[0032]Filter the mixture and dry it at 120°C for 12 hours to obtain the mixed TS-1 / CNF composite catalyst of the present invention, which is ready for use.

[0033] Wherein: the weight percent of the titanium silicon molecular sieve TS-1 is 20.0%, and the carbon nanofiber is 80.0%. The particle size of the titanium-silicon molecular sieve is 100-300 nm, and the particle size range of the composite catalyst is 5-80 μm.

Embodiment 3

[0035] Add 2 g of TS-1 for industrial use, 1 g of CNF and 50 ml of distilled water into a 150 ml three-necked flask, and stir at 500 rpm for 24 hours to obtain a mixture.

[0036] Filter the mixture and dry it at 120°C for 12 hours to obtain the mixed TS-1 / CNF composite catalyst of the present invention, which is ready for use.

[0037] Wherein: the weight percent of titanium silicon molecular sieve TS-1 is 66.7%, and the carbon nanofiber is 33.3%. The particle size of the titanium-silicon molecular sieve is 100-500 nm, and the particle size range of the composite catalyst is 1-80 μm.

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Abstract

The invention relates to a preparation method of composite catalyst of the titanium silicate molecular sieve and the nano-carbon fiber. The composite catalyst of the titanium silicate molecular sieve and the nano-carbon fiber prepared by the method of the invention has strong bonding force between the active component of the titanium silicate molecular sieve and the nano-carbon fiber. Comparing with the industrial micro-nano TS-1 powder (100-500nm), the filtering quality is significantly improved. In the course of using the TS-1 catalyst, the problem of the solution dispersion and separation can be solved; the method is simple and the application range is wide. The catalytic performance of the made composite catalyst is excellent, and can be used for the cyclohexanone ammoximation, the conversion rate of the cyclohexanone and the cyclohexanone oxime selectivity can both reach over 98 percent.

Description

technical field [0001] The invention relates to a preparation method of a titanium silicon molecular sieve / nano carbon fiber composite catalyst. The composite catalyst prepared by this method has a large characteristic size, and the combination between titanium-silicon molecular sieve (TS-1) and carbon nanofiber (CNF) is firm, which can solve the liquid phase separation of industrial TS-1 powder (100-500nm) question. The prepared composite catalyst can be used in a selective liquid-phase oxidation system using hydrogen peroxide as an oxidant, such as the ammoximation reaction of cyclohexanone. Compared with the industrial TS-1 catalyst, the catalytic performance is also excellent. technical background [0002] Titanium silicalite (TS-1 for short) with MFI structure has excellent catalytic oxidation activity and selectivity. One of the main factors affecting the activity of TS-1 is particle size. TS-1 with a small particle size (200-300) has better catalytic activity, whil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/89B01J21/18
Inventor 李平赵茜李道权潘伟源周静红隋志军周兴贵
Owner EAST CHINA UNIV OF SCI & TECH
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