Method for preparing nano catalytic composite materials by utilizing integrating process of ultrasonic-film-anti-solvent method

A technology of nano-catalysis and anti-solvent method, which is applied in the field of preparation of nano-catalytic composite materials, can solve the problems that it is difficult to uniformly disperse nano-materials, it is difficult to obtain nano-catalytic composite materials with particle size and morphology, and the uniform dispersion of nano-materials cannot be solved. Solve and other problems to achieve the effect of low production cost, stable structure and simple process

Inactive Publication Date: 2012-08-22
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conventional anti-solvent method has two problems to be solved: (1) It is difficult to uniformly disperse the nanomaterials into the non-solvent by conventional mechanical stirring, and the uniform dispersion of the nanomaterials in the non-solvent is the key to prepare homogeneously dispersed nanocatalytic composite materials. premise
(2) It is difficult to accurately control the supersaturation and diffusion degree of the solution by conventional methods, so it is difficult to obtain nano-catalytic composite materials with controllable particle size and morphology
However, in the process of preparing nanocomposites, the uniform dispersion of nanomaterials in antisolvent cannot be solved.

Method used

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  • Method for preparing nano catalytic composite materials by utilizing integrating process of ultrasonic-film-anti-solvent method
  • Method for preparing nano catalytic composite materials by utilizing integrating process of ultrasonic-film-anti-solvent method
  • Method for preparing nano catalytic composite materials by utilizing integrating process of ultrasonic-film-anti-solvent method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1, Nano Fe 2 O 3 / AP Preparation of Catalytic Composite

[0030] First, under the action of ultrasound (ultrasonic power is 1000w, ultrasonic frequency is 10 6 Hz, ultrasonic time is 15min), a certain amount of nano Fe 2 O 3 (30nm) dispersed in 200mL ethyl acetate. Then, under the action of 0.3MPa nitrogen, press 20mL of AP saturated acetone solution into the crystallization tank, and the AP will be nano-Fe 2 O 3 It is a nucleus, growing on its surface and finally forming nano-Fe 2 O 3 / AP composite particles. After filtering and washing the prepared nanocomposite material, it was vacuum dried at 60° C. for 3 hours.

Embodiment 2

[0031] Example 2. Preparation of nano CuO / AP catalytic composite material

[0032] First, under the action of ultrasound (ultrasonic power is 1200w, ultrasonic frequency is 10 7 Hz, the ultrasound time is 20 min), and a certain amount of nano CuO is dispersed in 300 mL of ethyl acetate. Then, under the action of 0.4 MPa nitrogen, 10 mL of AP saturated DMF solution is pressed into the crystallization tank, the AP will take nano CuO as the core and grow on its surface to form nano CuO / AP composite particles. After filtering and washing the prepared nanocomposite material, it was vacuum dried at 60° C. for 3 hours.

Embodiment 3

[0033] Embodiment 3 is basically the same as embodiment 1, but has the following changes:

[0034] The nano catalyst is Co 2 O 3 The particle size of the nano-catalyst is 10nm.

[0035] The solvent of ammonium perchlorate is water; the non-solvent of ammonium perchlorate is ethanol.

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Abstract

The invention relates to a method for preparing nano catalytic composite materials by utilizing an integrating process of an ultrasonic-film-anti-solvent method, comprising the following steps of: (1) the ammonium porchlorate saturated solution preparation process: dissolving ammonium porchlorate into a proper solvent to prepare the ammonium porchlorate saturated solution at certain temperature; (2) the dispersing process of a nano catalyst: uniformly dispersing the nano catalyst into an anti-solvent under ultrasonic action; (3) the preparing process: adding the AP (ammonium porchlorate) saturated solution to a nonsolvent through a film tube under certain pressure, wherein after the anti-solvent carries out desolvation on the solvent, the ammonium porchlorate is separated out and covers on the surfaces of uniformly-dispersed nano particles to form the nano catalytic composite materials; (4) filtering and drying processes: firstly carrying out solid-liquid separation on nano composite particles; and (5) the drying process: drying separated materials at 50-150 DEG C to obtain the nano catalytic composite materials. The nano catalytic composite materials prepared by the method have stable structure, uniform nano catalyst dispersion and controllable particle diameter and appearance.

Description

Technical field [0001] The invention relates to a preparation method of a nano catalytic composite material, in particular to a preparation method of a nano catalytic composite material (nano catalyst / ammonium perchlorate composite material) prepared by an ultrasonic-membrane-antisolvent method integrated process. Background technique [0002] Ammonium perchlorate solid propellant is a solid propellant that uses ammonium perchlorate as an oxidant. It is an important energetic material and has an important position in many fields such as missiles and aerospace technology. In order to improve the combustion performance of ammonium perchlorate-based solid propellants, the use of nano-catalysts has proven to be an effective method. However, due to the characteristics of easy agglomeration of nanoparticles, how to better disperse the nanocatalyst has attracted researchers' attention. [0003] The main method currently used to solve the agglomeration of nanocatalysts and oxidants for pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J37/34B01J23/745B01J23/72B01J23/75B01J23/755B01J21/04
Inventor 马振叶顾正桂吴如军纪明卫
Owner NANJING NORMAL UNIVERSITY
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