CoAl-metallic oxide/carbon nano tube composite as well as preparation method and application thereof as ammonium porchlorate catalyst

Abstract

The invention provides a CoAl-metallic oxide / carbon nano tube composite as well as a preparation method and application thereof as an ammonium porchlorate catalyst. The preparation method of the composite comprises the following steps of: preparing a CoAl-layered bimetallic hydroxide / carbon nano tube composite precursor by adopting a coprecipitation method and using L-cysteine as a cross-linking agent; and roasting at 500 DEG C under N2 atmosphere to convert the CoAl-layered bimetallic hydroxide in the composite precursor into CoO and a CoAl2O4 mixedoxide so as to obtain a CoAl-metallic oxide / carbon nano tube composite. The L-cysteine which is used as a cross-linking molecule can enhance the interaction between layered bimetallic hydroxide nano particles and carbon nano tubes in the precursor and improve the dispersity of the layered bimetallic hydroxide nano particles on the surfaces of the carbon nano tubes, thereby further influencing the disperse state of the CoAl-metallic oxide on the surfaces of the carbon nano tubes. The CoAl-metallic oxide / carbon nano tube composite has good thermocatalysis property, and when the composite is used as the ammonium porchlorate catalyst, a low-temperature exothermic peak decomposed by the ammonium porchlorate can be disappeared; the high-temperature exothermic peak temperature is reduced to 271.3-299.1 DEG C, and the decomposition speed is improved to 7.0-13.0mg / min.

Description

technical field

[0001] The invention relates to the technical field of catalyst preparation, in particular to a CoAl-metal oxide / carbon nanotube composite and a preparation method thereof. The catalyst is used to catalyze the thermal decomposition of ammonium perchlorate. technical background

[0002] The thermal decomposition characteristics of the propellant are mainly determined by the thermal decomposition characteristics of the oxidant. As an important oxidant, ammonium perchlorate generally accounts for 65% to 71% of the total mass of the propellant, so the thermal decomposition characteristics of ammonium perchlorate have an important impact on the overall combustion performance of the solid propellant. Studies have shown that nanoparticle catalysts with combustion properties, including metal elements, metal oxides, composites, etc., can reduce the thermal decomposition temperature of ammonium perchlorate or increase the decomposition rate, and have a good effect on ...

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