Application Of Iron-Based Catalysts In The Electrocatalytic Conversion Of CO₂ In Marine Oil And Gas

Electrocatalytic CO₂ conversion technology is used for the treatment of CO₂ in Marine oil and gas,it not only has a high efficiency in the electrocatalytic conversion of CO₂ into CO,CH₄,etc.,but also performs the electrocatalytic reaction at room temperature and pressure.In particular,for offshore drilling and production platforms with limited space,the electrocatalytic conversion device is small in size and simple in operation,its products such as CO,CH₄ and C₂H₄ can be directly used as living fuel to solve the fuel supply problem on the platform.However,noble metal catalyst is still the most effective catalyst in the electrocatalytic conversion of CO₂,which are expensive and not suitable for industrial promotion.Hence,it is an urgent need for CO₂ electrochemical reduction process to find an alternative catalyst with high catalytic efficiency,abundant resources,good stability and low cost.At present,non-noble metal iron?Fe?based catalysts show similar efficiency of CO formation as Au and Ag noble metal based catalysts.However,iron-based catalysts require a higher over-potential to achieve the same bias current density as noble metal based catalysts.Therefore,it is proposed to adopt nano-carbon materials to support Fe based catalysts to reduce the overpotential of the catalysts.Nano carbon material has good conductivity,diverse hybrid structure,varied topography and plentiful in resources,thus caused wide attention from scientists.Research has shown that transition metal elements and their compounds have Vacant and active d electrons,which can promote the combination of metal and CO₂molecules and the desorpt of its products.Researchers have developed a large number of new inorganic heterogeneous catalysts,iron and nitrogen doped porous carbon is one of the most active electric catalyst for catalytic reduction of CO₂.This article is arranged as follows:1.First of all,iron nanoparticles catalyst were prepared,then the properties of catalysts with different iron loads were tested,and found that in 1100?calcination temperature,the catalyst of iron content of 2.36wt.%performs best,and its CO Faraday efficiency can reach88%.2.Secondly,the influence of different calcination temperatures on the performance of electrocatalytic CO₂ reduction of iron nanoparticles was firstly studied,and it was found that the performance of iron nanoparticles were gradually enhanced with the increase of pyrolysis temperature in the range of 800¹100?,and the Faraday efficiency of CO increased from the original 31%to 88%.3.Subsequently,the effect of surfactant used in the preparation process was studied,and found that the participation of surfactant F127 helped to anchor iron ions and control the particle size of iron in the roasting process.At the same time,the amorphous carbon layer can be formed effectively after calcination.Thus improve the electrocatalytic reduction activity of the catalyst.4.Finally,the influence of hydrochloric acid solution immersion on the catalyst after roasting was studied,and found that hydrochloric acid etching could effectively remove the uncoated Fe₃O₄ nanoparticles,so as to effectively improve the electron transfer rate on the surface of the iron nanoparticles catalyst and promote the electrocatalytic reduction reaction of CO₂.