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MOFs (Metal-Organic Frameworks)-based carbon-cladded ZnO core-shell structure nano-material and preparation method thereof

A core-shell structure, nanomaterial technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve problems such as slow decomposition rate and reduce decomposition temperature. , the effect of accelerating electron transfer and improving dispersion

Active Publication Date: 2018-11-13
HARBIN INST OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the technical problem of slow decomposition rate when the existing single ZnO catalyst catalyzes the thermal decomposition reaction of ammonium perchlorate, and provides a carbon-coated ZnO core-shell structure nanomaterial based on MOFs and its preparation method

Method used

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  • MOFs (Metal-Organic Frameworks)-based carbon-cladded ZnO core-shell structure nano-material and preparation method thereof
  • MOFs (Metal-Organic Frameworks)-based carbon-cladded ZnO core-shell structure nano-material and preparation method thereof
  • MOFs (Metal-Organic Frameworks)-based carbon-cladded ZnO core-shell structure nano-material and preparation method thereof

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specific Embodiment approach 1

[0026] Specific embodiment 1: The carbon-coated ZnO core-shell structure nanomaterial based on MOFs in this embodiment is a nanosphere with ZnO nano-spherical particles as the core and carbon as the shell. The size of the nanosphere is 400-750nm, and the carbon shell The thickness is 50-180nm.

specific Embodiment approach 2

[0027] Specific embodiment two: the preparation method of the above-mentioned carbon-coated ZnO core-shell structure nanomaterial based on MOFs is carried out according to the following steps:

[0028] 1. Set the quality to M 1 of zinc acetate dissolved in a volume of V 1 in diethylene glycol, heated to 160-165°C and stirred and refluxed for 1-1.5h, then cooled to room temperature, centrifuged, and the supernatant was collected, wherein the volume of the supernatant was W 1 , and W 1 =(50%~80%)V 1 ;

[0029] 2. Re-weigh the mass as M 2 of zinc acetate with volume V 2 Diethylene glycol, and zinc acetate dissolved in diethylene glycol, heated to 140 ~ 145 ° C, adding a volume of W 2 The supernatant obtained in step 1 is stirred evenly, then heated to 160-165° C., stirred and refluxed for 1-1.5 hours, then cooled to room temperature, centrifuged to separate the solid phase, washed and dried to obtain spherical ZnO nanoparticles; where M 1 :V 1 = M 2 :V 2 ;

[0030] Th...

specific Embodiment approach 3

[0032] Embodiment 3: The difference between this embodiment and Embodiment 2 is that in step 1, after zinc acetate is dissolved in diethylene glycol, the concentration of zinc acetate is 0.1-0.2 mol / L; other aspects are the same as Embodiment 2.

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Abstract

The invention provides a MOFs (Metal-Organic Frameworks)-based carbon-cladded ZnO core-shell structure nano-material and a preparation method thereof and relates to a ZnO composite nano-material and apreparation method thereof, aiming at solving the technical problem that the decomposition speed is slow when an existing single ZnO catalyst is used for catalyzing thermal decomposition reaction ammonium perchlorate. The nano-material provided by the invention is a nano-sphere which takes a ZnO spherical nanoparticle as a core and carbon as a shell. The preparation method comprises the followingsteps: 1, dissolving zinc acetate in diethylene glycol and reacting, and taking supernatant; 2, then dissolving the zinc acetate in the diethylene glycol; adding the supernatant and reacting to obtain ZnO nanoparticles; 3, enabling 2-methylimidazole and the ZnO nanoparticles to react to prepare 2-methylimidazole zinc salt cladded ZnO core-shell structure spherical particles; 4, calcining to obtain the carbon-cladded ZnO core-shell structure nano-material. When the material is used for catalyzing thermal decomposition of AP, a decomposition peak is advanced to 293 to 295 DEG C and the apparentdecomposition heat reaches 1,420 to 1,435J / g, so that the material can be applied to the field of catalysis.

Description

technical field [0001] The invention relates to a ZnO composite nano material and a preparation method thereof. Background technique [0002] Solid propellant is a heterogeneous energetic composite material used for rocket propulsion. It is the power source of various weapon systems such as strategic missiles, tactical missiles, and air defense and anti-missile systems. It is mainly composed of polymer binders, oxidizers, metal fuels and An energetic material composed of functional components. Ammonium perchlorate, as one of the most important oxidants in solid propellants, accounts for more than 25% of the total content of solid propellants, even as high as 70%. The thermal decomposition characteristics of solid propellants have a significant impact on its combustion performance. It is generally the basis and necessary step for the combustion reaction of solid propellants. For ammonium perchlorate with a content of up to 70%, its thermal decomposition performance has a gre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/06B01J35/02B01J35/00
CPCB01J23/06B01J35/40
Inventor 李杨吴晓宏乔亚东秦伟
Owner HARBIN INST OF TECH
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