The Preparation Of PTFE Aerogel Composited Carbon Nanotube And Study Of Catalytic Properties

Carbon aerogels are carbon nanomaterials that possess lighter mass,high void volume,and large specific surface area,and have a well-developed spatial network three-dimensional structure.As a special material,it has been favored by researchers in recent years.The special spatial structure of carbon aerogel and its good performance in all aspects make his use more and more extensive.It has played an important role in the fields of stencils,energy storage materials,and electrochemistry.In addition,the performance of catalysts and carriers has gradually been unearthed by scientists.With the advancement of science and technology,researchers have used existing rich resources,and more and more materials have been used to prepare aerogels with porous structures.At the same time,they are also investigating their application value.In this thesis,the preparation of carbon aerogels is first reviewed.The types of aerogels and the classification of carbon nanomaterials are described in detail.The properties and the application prospects in all aspects of carbon nanomaterials and the preparation of carbon aerogels in society are described in detail.In particular,the process of carbon aerogels synthesized from carbon nanomaterials and polytetrafluoroethylene polymers is introduced.The copper particles supported on aerogels are realized by Chemical copper plating.Finally,carbon aerogel catalytic properties are studied.The first part of the experiment is mainly to prepare carbon nanomaterial composite PTFE copolymer aerogel.Hydrogels are prepared by mixing agar solutions with carbon nanomaterials(carbon nanotubes,carbon nanofibers,graphene)and polytetrafluoroethylene copolymer emulsions.After being vacuum-dried for 24 hours at a later stage,calcination at 360℃ under an inert atmosphere for a period of time produced an aerogel with various shapes and spatial three-dimensional structure.The resulting aerogel material has a porous structure having excellent permeability to liquids and gases,and the porous structure includes macropores and mesopores(macroporous diameter 10-200 μm,mesopore diameter 0.5-10 μm).With large specific surface area,strong load capacity,stable structure,porous structure with stable shape,excellent chemical stability,acid and alkali resistance,high temperature resistance,no decomposition or deformation in different liquid solvents.The second part of the experiment is mainly to achieve the loading of metallic copper particles on the prepared carbon aerogel.The method used is to use a glass tube reactor built by oneself.The prepared carbon aerogel is filled into the glass tube in sequence,and then the electroless plating solution is slowly injected into the glass pipeline with a syringe at a suitable pH and temperature.The third part of the experiment is to study the catalytic performance of the carbon nanomaterial composite aerogel as a catalyst carrier.The selected reaction system is decarboxylation and nitration on the benzene ring.Specifically,the decarboxylation and nitration reaction of p-hydroxybenzoic acid is investigated and the reaction conditions were determined.The formation of the desired product is analyzed by high pressure liquid phase testing and the yield is calculated.