Research On Nano-accelerator Of Carbon Dioxide Hydrate Based On Polyaniline

In recent years,the uncontrolled exploitation and utilization of fossil energy has resulted in the production of large amounts of CO₂and other greenhouse gases,which have seriously threatened the natural and human living environment.CO₂capture and storage technology（CCS technology）as a technology that can significantly reduce CO₂emissions,has attracted widespread attention and research and development.However,traditional CCS technology has many shortcomings,and there is an urgent need to develop new and efficient carbon sink technologies.The hydrate CO₂separation and capture technology has the advantages of high gas storage density and safe storage and transportation.However,under natural conditions,hydrates generally have problems such as low formation rate and many restrictions,so physical or chemical methods are often used to improve their formation conditions.The current physical method and chemical method have the advantages of high production rate and high gas storage capacity,but the problems of high cost and environmental pollution are not conducive to practical application.This article starts from the direction of synthesizing a new type of CO₂hydrate formation accelerator,and solves many problems of the current accelerator that are not conducive to practical application.In view of the many problems existing in the traditional accelerator,this paper uses the method of chemical oxidation polymerization,through the regulation of aniline,m aminobenzene sulfonic acid and ammonium persulfate concentration,stirring time and other conditions successfully synthesized shell,tubular,granular-SO₃^-@PAN.The success of-SO₃^-doping into the molecular chain of polyaniline was proved by infrared spectroscopy,and the sulfonation degrees of 54%,27%and 55%were calculated by elemental analysis results.Using the good thermal conductivity of Ag nanoparticles,two kinds of Ag&-SO₃^-@PAN with different content of Ag were synthesized by photocatalytic reduction.The Ag particles on the surface of Ag&-SO₃^-@PAN synthesized by high Ag⁺concentration were large in size but few in number,while the Ag particles on the surface synthesized by low Ag⁺concentration were small in size but many in number.The promotion effect and mechanism of the new promoters on the formation of CO₂hydrate were studied by comparing with SDS and SDBS of 1mmol/L using several kinds of-SO₃^-@PAN and Ag&as promoters.The effects of several accelerators are similar in the whole process of agitation,and the gas storage capacity is all about158 V/V.The gas storage capacity of-SO₃^-@PAN and Ag&-SO₃^-@PAN is 10-20 V/V higher than that of 1mmol/L SDS and SDBS under the condition of initial agitation to2.5MPa.Under the condition of initial agitation to 2.7MPa,the promotion effect of-SO₃^-@PAN is poor,and the gas storage capacity is only between 85-90 V/V.However,the gas storage capacity of the two kinds of Ag&-SO₃^-@PAN can reach 100-120 V/V,reflecting the promoting effect of Ag nanoparticles on hydrate formation.The preliminary exploration of the formation of CO₂hydrate was carried out by using-SO₃^-@PAN under the condition of electric field.Under the conditions of electric field intensity 6×10⁴V/m,reaction pressure 3MPa and reaction temperature 2℃,the formation of CO₂hydrate nucleus did not show effective promoting effect.Only under the conditions of electric field intensity of 6×10⁴V/m,reaction pressure of 3.5MPa and reaction temperature of 0℃,it can promote the formation of hydrate nucleation,but the promotion effect is general.This is because the low intensity of the electric field used in the experiment cannot significantly reduce the activation energy needed for hydrate nucleation.