Isolation Aspects Of The Preparation Of Porous Carbon Material And Adsorption Of CO₂ Gas

The global greenhouse effect caused by CO₂ industrial production and energy combustion has become the primary worldwide problem. A new material that has better performance on adsorbing CO₂ has already been an urgent task to be solved in scientific research community. Among the wide range of CO₂ adsorbents, a porous carbon material draws attention from researchers and world because of its high specific surface area, adjustable pore structure, surface adsorption of mildness, environment-friendly and other advantages. Thus this kind of synthesis of high CO₂ adsorption and selectivity of the porous carbon material is a high-value research topic.This research synthesized, modified three porous carbon materials, studying the natures of gas abortion and separation. Select the metal organic framework ZIF-70 as a template, PEI for the double carbon and nitrogen sources. The PEI was injected in the ZIF-70 channel. And after calcination process, it was made into a porous carbon material with higher surface area(652.44 m2·g^-1), high nitrogen content（11.08%）. High nitrogen content led a good action of selective adsorption ability in CH₄/CO₂, H₂/CO₂.The results showed that: the PEI and ZIF-70 injection ratio of 1: 1 was formed of carbon precursor, which was carbonized at 900 ℃ of the obtained porous carbon material of the nitrogen-rich CO₂ adsorption would be the best choice. And the maximum adsorption was 4.86 mmol·g^-1（0℃ 1 bar） and 3.56 mmol·g^-1（25℃ 1 bar）.After using a carbon precursor carbonized ZIF-8 to amino-modified the surface, it made to the porous carbon material which have a large number of amino functional groups on the surface and after absorbing the porous carbon material of CO₂ gas, which reached 4.2 mmol·g^-1. The imitation industrial emissions tested amino porous carbon material selective adsorption. The experimental results showed that the mixed gas of aminated porous carbon material with good CO₂ adsorption performance at 0.15 bar up to 4.2 mmol·g^-1, and had a high CO₂/N₂ selective adsorption, where CO₂ /N₂ selectivity at 25℃ up at 770, 50℃ up to 1200.Synthetize ZIF-8 and 5A raw material to gather preparation- carbon composites.And composite materials for the adsorption of gas under normal temperature and pressure tested composites of selective adsorption; the experimental results show that CO₂ gas: molecular sieves- carbon composite material has a good selection of CO₂ adsorption performance in CO₂/N₂, CO₂/CH₄ penetration test has a good performance.