Preparation Of High Pyrrole Nitrogen Doped Microporous Carbon And Ordered Mesoporous Ni/carbon Composites And Their CO₂ Adsorption Properties

The CO₂ capture by adsorption method,adsorption method with its simple technological process,the characteristics of stable operation with low energy,no corrosion of equipment and the advantages of mature technology,has reached the standard of industrialization.This method is a promising and promising CO₂ capture technology.The key to capture CO₂ by adsorption is to select a adsorbent with high CO₂ adsorption capacity and selectivity.Therefore,adsorbent is important.Excellent adsorbents to meet the following conditions:high adsorption capacity;High selectivity;Easy regeneration;CO₂ adsorbent with high adsorption/desorption rate.At present,the traditional adsorbent has low selectivity of CO₂,and in this paper,it is proposed to use nitrogen-containing materials to synthesize nitrogen-doped carbon materials as CO₂ adsorbents.The results are as follows:A pyrrolic N-enriched microporous carbon composite was synthesized using solvent-free mechanochemical strategy via copolymerized melamine/dopamine?PDA/MA?within ultra-short reaction time?30 min?,mainly characterization of materials such as morphology,crystal structure,thermal stability,FT-IR,specific surface area and pore structure tests,the results are as follows:the synthetic nitrogen doped porous carbon materials electron microscopy images showed irregular lamellar morphology,different alkali/carbon ratio and little effects on the morphology of the activation time of materials.After carbonized activation,the graphite-like structure was present,and the nitrogen doped microporous carbon materials produced were of ultraporous structure?5-6 A?and higher content of pyrrolide?13.1 wt.%?.The adsorption equilibrium of CO₂ and N₂ with nitrogen doped micropore carbon with different raw materials was studied,and the choice of CO₂/N₂ was calculated by using ideal adsorption solution theory?IAST?.The adsorption capacity of PDA0.3/MA0.7-2 in 1 bar and 273 K was 4.6 mmol/g?3.64 mmol/g at 298 K?.The adsorption heat of CO₂ of PDA0.3/MA0.7-2 was fitted by the dimension equation,and the result was 37.4 kJ/mol,indicating that PDA0.3/MA0.7-2 had a strong adsorption effect on CO₂ molecules.In 273K,the CO₂ adsorption performance of PDA0.3/MA0.7-2 was stable.After 5 cycles,the adsorption capacity of CO₂ was basically unchanged,showing excellent regeneration performance.According to the ideal adsorption solution theory,PDA0.3/MA0.7-2 is highly selective for CO₂,and is up to 108 at 273 K and CO₂/N₂?10:90?.High CO₂ adsorption and selectivity,green and rapid synthesis method make PDA/MA composite material can be the adsorbent for removing CO₂ from flue gas.CO₂ hydrogenation is an efficient method for CO₂ conversion,and it is studied in situ synthesis of Ni catalyst as catalyst for CO₂ methanation.Using phenolic resin,nickel source,F127,by adopting the method of solvent evaporation self-assembly?EISA?synthesis Ni/carbon precursor,after high temperature carbonization,in situ synthesis of ordered mesoporous Ni/carbon composites.The pore diameter of the material is about 3.4nm,and the homogeneous nickel particles are dispersed in the carbon network.The control of nickel particle size can be achieved by controlling the type and doping amount of nickel source.With the increase of temperature,the increase of doping amount and the increase of nickel core,it is easier for the nickel particles to get together in the carbonization process,thus forming a larger size of single nickel particles.According to the adsorption test of CO₂ by materials,the CO₂ adsorption capacity of Ni2-1/FDU-15-600 was the largest,reaching 4.49 mmol/g,which was 43%higher than the adsorption capacity of FDU-15-600 materials.