原料煤的结构特性和添加剂对活性炭孔隙结构及吸附CO2 性能的影响

选用5 种原料煤,3 种添加剂分别考察煤结构特性和添加剂种类对制备活性炭性能的影响,以比表面积、孔径分布、CO₂ 吸附量、碘值、微晶结构尺寸对活性炭进行表征。结果表明:由于5 种原料煤结构特性的不同,经炭化之后微晶高度和层片宽度都有不同程度的变化。太西煤炭化料的微晶结构在后期活化阶段最为适宜,从而以灰分低、挥发分适中的太西无烟煤为原料,制备的活性炭微孔最为发达,吸附CO₂ 的性能最佳;3 种添加剂中NH₄Cl+KNO₃ 效果最为显著,制备的活性炭比表面积为1 093 m² / g,微孔孔容为0. 415 mL/ g,CO₂ 的吸附量为2.41 mmol/ g(0.1 MPa,25 ℃)。

Effects of structural characteristics of raw coal and additives on pore structure and CO2 adsorption properties of activated carbon

Five coals and three additives were used to investigate the influence of coal structural characteristics and additives on the performance of activated carbon prepared under the same conditions. The specific surface area,pore size distribution,iodine number were used to characterize the activated carbon. The results show that the changes in microcrystalline height and width of carbonized coals are mainly attributed to the different structural characteristics of the five raw coals. The microcrystalline structure of Taixi coal is most suitable in activation stage,and the activated carbon produced from Taixi anthracite with low ash and moderate volatile matter has the most porous micropore and the best adsorption capacity of CO₂. Among the three additives,the effect of NH₄Cl+KNO₃ is the most significant,by which the specific surface area of the activated carbon is 1 093 m² / g,the micropore volume is 0. 415 mL/ g and the adsorption capacity of CO₂ is 2.41 mmol/ g(0.1 MPa,25 ℃).