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Method for coating nano metal oxide catalyst precursor on ammonium perchlorate surface

A nano metal, ammonium perchlorate technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., to simplify the dispersion process, accurate control, and autocatalytic effects obvious effect

Inactive Publication Date: 2013-04-24
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a new nano-oxide catalyst precursor coating AP method, thereby solving the dispersion problem caused by mixing the nano-oxide catalyst and AP, and can efficiently catalyze the thermal decomposition of AP

Method used

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  • Method for coating nano metal oxide catalyst precursor on ammonium perchlorate surface
  • Method for coating nano metal oxide catalyst precursor on ammonium perchlorate surface
  • Method for coating nano metal oxide catalyst precursor on ammonium perchlorate surface

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preparation example Construction

[0028] The preparation method provided by the invention comprises the following steps:

[0029] (1) The prepared mass is m AP The ammonium perchlorate (AP, Ammonium Perchlorate) is used for preparation, m AP is any value; the catalyst precursor (catalyst precursor) chemical formula is M a S b , with a mass of m cp , the relative molecular weight is M cp The chemical formula of the nanometer metal oxide catalyst (metal oxide nanocatalyst) that catalyst precursor thermal decomposition (before AP thermal decomposition) produces is M x o y , the relative molecular weight is M mon , the mass percent of nanometer metal oxide catalyst and AP is r (0.1%sol , with density ρ, at the solvent melting point (T m ) and boiling point (T b ) between two temperature points t 1 and t 2 ,T m 1 2 b (t 1 preferably room temperature), at t 1 At temperature, the solubility of the catalyst precursor in the solvent is m 1 , at t 2 At temperature, the solubility is m 2 , requiring (m 2...

Embodiment 1

[0035] AP / Co(NO 3 ) 2 Composite particles, m AP =2g, r=4%, the catalyst precursor is Co(NO 3 ) 2 , m cp =0.7752g, solvent is ethyl acetate, volume is V sol = 60mL, t 1 =25°C, t 2 = 60°C. The preparation steps are sequentially heating, dissolving, stirring, cooling, filtering and drying.

[0036] The AP used in the composite material is provided by Shanghai Reagent Co., Ltd., with an average particle size of 135 μm, and its morphology is shown in the attached figure 2 (a), (b) shows that the surface of uncoated AP particles is smooth.

[0037] In order to use a scanning electron microscope (FESEM FEI Sirion 200) to observe the coating effect of the obtained powder, its morphology is shown in the attached figure 2 As shown in (c) and (d), most of the surface of AP is coated, and the coating layer is dense and dendritic, with a length of about several microns. In order to analyze the elemental composition of the obtained powder, EDX analysis was performed on the comp...

Embodiment 2

[0042] AP / Co(NO 3 ) 2 Composite particles, m AP =2g, r=0.1%, the catalyst precursor is Co(NO 3 ) 2 , m cp =0.4924g, solvent is ethyl acetate, volume is V sol = 60mL, t 1 =25°C, t 2 = 60°C. The preparation steps are sequentially heating, dissolving, stirring, cooling, filtering and drying.

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Abstract

The invention discloses a method for coating a nano metal oxide catalyst precursor on ammonium perchlorate surface, which comprises the following steps: (1) adding a catalyst precursor into a solvent, and completely dissolving by stirring while controlling the temperature, thereby obtaining a catalyst precursor solution; (2) adding ammonium perchlorate into the catalyst precursor solution, wherein the ammonium perchlorate is insoluble in the catalyst precursor solution, and keeping stirring to uniformly disperse the ammonium perchlorate; (3) changing the temperature, reacting for some time, and stopping stirring to obtain the product; and (4) filtering the product, and drying to obtain the nano composite material. The catalyst precursor can be Co(NO3)2.6H2O, KMnO4, Cu(NO3)2.3H2O, Fe(NO3)3.9H2O or Zn(CH3COO)2.3H2O; and the solvent is ethyl acetate, ethanol or acetone. The invention solves the problem of dispersity of the nano oxide catalyst in AP (ammonium perchlorate); the method is simple and stable, and is accurate for control and simple to operate; the oxide catalyst can be generated in situ on the AP, and has obvious autocatalysis effect; and the method can be combined with a rocket propellant preparation technique to simplify the catalyst dispersion technique.

Description

technical field [0001] The invention relates to a surface coating technology, in particular to a method for coating a nanometer metal oxide catalyst precursor on the surface of ammonium perchlorate (AP): a supersaturated crystallization method. Background technique [0002] AP is an important energetic material. Only by improving the thermal decomposition effect of AP and promoting the thermal decomposition of AP can it fully release energy. Among the many methods to improve the thermal decomposition effect of AP, catalyzing the thermal decomposition of AP by adding a combustion catalyst is considered to be one of the most effective methods. According to the composition and structure of combustion catalysts, commonly used and effective varieties can be classified into the following three categories: (1) metal oxide catalysts; (2) metal element catalysts; (3) ferrocene and its derivatives catalysts. Among them, the high chemical activity of the metal element catalyst is also...

Claims

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Application Information

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IPC IPC(8): B01J37/08B01J23/75B01J23/34B01J23/72B01J23/745B01J23/06
Inventor 曾大文李海涛谢长生田守勤
Owner HUAZHONG UNIV OF SCI & TECH
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