Study On Preparation Of Nano Cobalt Oxide And Carbon Composite And Its Catalytic Performance For Thermal Decomposition Of AP

Cobalt oxides have been extensively studied because of its unique structure and properties.α-Co（OH）₂ has attracted much attention due to its large interlayer spacing,good redox properties,large specific surface area,abundant resources and low price.But there are many problems in the preparation of nanometer sized α-Co（OH）₂,such as complex operation,harsh conditions and difficult to control.Co₃O₄ as a mixed valence transition metal compounds have a good empty electron orbit,which is easy to accept electronic pair and generate stable intermediate products,promoting response quickly to the direction of the positive reaction.Therefore,Co₃O₄ can be used as an excellent catalyst material.In this paper,we use a simple method to synthesis spherical nanometer level flower-like α-Co（OH）₂ with cobalt salt and alkali solution mixing method.Co₃O₄/bacterial cellulose carbon（Co₃O₄/CBC）and Co₃O₄/ graphene oxide（Co₃O₄/GO）nanocomposites were prepared with flower-like α-Co（OH）₂,CBC and GO as raw materials.We investigate the catalytic performance of composite materials for thermal decomposition ammonium perchlorate（AP）.The main contents are as follows:（1）Microscale and nanoscale flower-like α-Co（OH）₂ were synthesized at room temperature by a simple solution-phase method.These two kinds of flower-like α-Co（OH）₂ showed good catalytic effect on the thermal decomposition of AP.When the addition of catalyst is 3%,the low temperature thermal decomposition process of AP disappeared.Moreover,the peak of high temperature decomposition was shifted to 264 ℃ and 285 ℃,respectively.Compared with pure AP,the peak of higher temperature decomposition decreased by 175 and 158 ℃,respectively.（2）Co₃O₄ nanoparticles with a diameter of about 10 nm were prepared by a hydrothermal method using α-Co（OH）₂ as a raw material.We successfully synthesize Co₃O₄/CBC and Co₃O₄/GO nanocomposites with CBC and GO were used as the substrate to combine with Co₃O₄ nanoparticles.Co₃O₄,Co₃O₄/CBC and Co₃O₄/GO have good catalytic performance for AP.we studied the effect onthe thermal decomposition of AP of different ratio of Co₃O₄ to C.It was concluded that when CBC and GO were added at 14%,the catalytic propertie s pf Co₃O₄/CBC and Co₃O₄/GO composites were the best.When the addition of the catalyst was 3%,the low temperature thermal decomposition process of AP disappeared.Moreover,the peak of high temperature decomposition was shifted to 289℃ and 272℃,respectively.Compared with pure AP,the peak of higher temperature decomposition decreased by 150 and 167 ℃,respectively.