Perparation Of Spherical Activated Carbon And Study On The Adsorption Of Carbon Dixide By Displaying Coalbed Gas

Coal-bed gas as clean energy is widely used in industrial, power generation, automotive and household fuel all over the world. Coal seam gas reserves in China is also very rich, but most serious gas have wasted because of the low permeability and difficult mining. In order to solve this problem, scholars have put forward displacement of coalbed methane gas injection technology, especially the injected CO2displacement(CO2-ECBM). The technology not only improve the recovery og coalbed methane, but also put large amounts og carbon dioxide sequestration in coal seams. The result is that emissions of carbon dioxide in the air reduced, and environment have been protected.One of the problems in CO2-ECBM technology is the source of carbon dioxide. At present most carbon dioxide from coal-fired power plants. In order to coal-fired power plant emissions of clean dioxide concentration, therefore the development of adsorbent with high adsorption performance is the focus of the study. Therefore on the basis of predecessors’research, this paper further studies the solid adsobent---the preparation of macroporous adsorption resin based spherical activated carbon, and its adsorption properties of carbon dioxide were measured. Through the air pre-oxidation, carbonization, steam activation were prepared with different specific surface area of spherical activated carbon. The different specific surface area of spherical activated carbon was prepared by air pre-oxidation, carbonization, steam activation system. Filtering effect is superior to surface modification of activated carbon, preparation of spherical activated carbon were characterized by thermogravimetry, electron microscopy, elemental analysis, pore structure analysis and XPS method. Finally test the adsorption performance of CO2. The conclusion is as follows:(1) Using polystyrene-based macroporous adsorption resin as spherical activated carbon for preparing high adsorption properties of materials, increasing the curing resin by air oxidation pretreatment, improving the yield.(2) Preparation of spherical activated carbon prepared by carbonization and steam activation. The activation temperature and activation time deeply affect the performance of the activated carbon. CC14adsorption capacity increased with the increase of the activation temperature and time, but the yield decreased gradually, the maximum CC14adsorption value is2700mg/g, the yield is only21.3%. The relationship between CC14adsorption value is not proportional with the amount of CO2adsorption. In810℃activation of spherical activated carbon prepared by2h specific surface area is 1274.95m2/g. The adsorption quantity of CO2is2.83mmol/g. It has better regeneration performance.(3) After ammonia activation of spherical activated carbon modified with high specific area and abundant pore structureand and rich nitrogen. Adsorption of CO2measured at30℃for3.3mmol/g, the existence of water will hinder the adsorption of CO2. At the same temperature,the surface amino of spherical activated carbon adsorption of CO2is greater than that of water vapor activation spherical activated carbon.(4) Water vapor activation and ammonia activation of spherical activated carbon adsorption of CO2under high pressure are high. At25℃, adsorption capacities were12.28mmol/g and14.55mmol/g. Adsorption decreased with the increase of temperature. After introducing nitrogen functional groups, the chemical adsorption of active carbon increased,the adsorption performance of CO2increase,but did not significantly affect the samples attached. Under relatively mild conditions,after four cycles of the sample has a better regeneration performance.