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Preparation method of alcohol aromatization catalyst

An aromatization and catalyst technology, which is applied in the field of alcohol aromatization catalyst preparation, can solve the problems of poor aromatization catalyst activity and stability, and achieves excellent reaction stability, good technical effect, and inhibition of carbon deposition. Effect

Inactive Publication Date: 2015-08-19
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Technical problem: In order to solve the problem of poor activity and stability of aromatization catalysts in the prior art, a new preparation method for alcohol aromatization catalysts is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: Preparation of atomic layer deposition method ZnO modified ZSM-5 catalyst:

[0027] 1) Take 10gZSM-5, 0.30mol / L NaHCO 3 800mL of the solution was fully stirred and mixed, then heated in a water bath at 80°C for 8h; then filtered and washed. The washed molecular sieves were exchanged 3 times with 0.8 mol / L ammonium nitrate solution in a water solution at 75°C, each exchange was 12 hours. After the exchange, the solution was filtered, washed, dried at 120°C for 10 hours, and calcined at 550°C for 5 hours to obtain a solid powder.

[0028]2) Place the solid powder obtained in step 1) in the flow chamber of the ALD reaction, and pass diethylzinc and water in the flow chamber in a pulse-alternating manner under the condition of 180° C., during which high-purity nitrogen is used for purging, Its single cycle reaction time is (15ms-20s-15s-15ms-20s-15s). Among them, 15ms is the pulse time, 20s is the waiting time, that is, the exposure time of the source in th...

Embodiment 2

[0030] Preparation steps and method are identical with embodiment 1, just the NaHCO of 0.30mol / L in embodiment 1 step 1) 3 The solution was changed to 0.15mol / L HCl solution.

Embodiment 3

[0032] Preparation steps and method are identical with embodiment 1, just the NaHCO of 0.30mol / L in embodiment 1 step 1) 3 The solution was changed to 0.50mol / L gluconic acid solution, and the 0.8mol / L ammonium nitrate solution was changed to 1.0mol / L ammonium chloride solution.

[0033] Example 4:

[0034] The preparation steps and method are the same as in Example 1, except that the number of cyclic reactions in Step 2) of Example 1 is increased to 200.

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Abstract

The invention provides a preparation method of an alcohol aromatization catalyst. The preparation method comprises treating a carrier ZSM-5 by acid or alkali so that ZSM-5 aperture sizes are increased, removing organic matter impurities on the carrier surface so that carrier surface purity is improved and hydroxyl-rich mesoporous HZSM-5 is obtained, putting the mesoporous carrier into a reaction chamber of an atomic layer deposition (ALD) device, and coating the surface of the carrier with one or more metal or metal oxide nanometer particles layer by layer by an ALD method. Through control of a reaction chamber substrate temperature, a metal source gasification temperature and unit circulating for repeating atomic layer deposition, catalyst metal carrying capacity and acidity are regulated and controlled. The alcohol aromatization catalyst has accurately controllable catalytic material carrying capacity and high carrier tunnel conformality, effectively inhibits catalyst carbon formation, sintering and active metal seepage, and further realizes alcohol aromatization reaction activity improvement and better reaction stability.

Description

technical field [0001] The invention relates to a preparation method of an alcohol aromatization catalyst. More specifically, the present invention relates to the introduction of active metals on a modified carrier by atomic layer deposition, wherein the active metals are evenly distributed in the catalyst, and the catalyst prepared by this method not only has high aromatization activity and stability, but also It has high yield and selectivity of aromatics. Background technique [0002] Aromatics mainly include benzene, toluene, and xylene, which are basic organic chemical raw materials and are widely used in synthetic fibers, synthetic resins, synthetic rubbers, and various fine chemicals. Aromatics are mainly derived from catalytic cracking and catalytic reforming reactions of crude oil. In recent years, due to the continuous consumption of crude oil reserves and the increasingly tight supply of fossil resources, the use of new energy sources instead of crude oil as raw...

Claims

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Application Information

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IPC IPC(8): B01J29/40C07C1/20C07C15/02
Inventor 肖国民王飞肖为引
Owner SOUTHEAST UNIV
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