吸附汽油蒸气活性炭的制备研究

以市售活性炭和炭化料为原料,NH4NO3和K2CO3混合物为复合添加剂,水蒸汽活化法制备了汽油蒸气吸附用活性炭.通过测定活性炭的丁烷工作容量（BWC）、碘吸附值和氮吸附等温线,研究了活性炭制备条件特别是添加剂对丁烷工作容量和孔隙结构的影响.结果表明,制备条件对BWC的影响顺序依次为活化温度、添加剂用量和活化时间;较高的活化温度和较大的添加剂量均促进了活性炭中孔的发育;活性炭的BWC与中孔孔容呈明显正相关性,同时受微孔表面积和总孔容影响也较大;活性炭吸附丁烷后的首次解吸率在60%左右,循环解吸率达95%以上.

Research on the Preparation of Activated Carbon for Adsorbing Gasoline-Vapor

Activated carbon(AC) used for adsorbing gasoline-vapor was prepared from commercial AC and carbonized material by soaking with the mixture of NH_4NO_3 and K_2CO_3 as additive.The butane working capacity(BWC),iodine number and nitrogen adsorption isotherm were measured.Effects of the preparation conditions,especially additive on BWC and pore-structure of AC were investigated.The results show that the influence of the conditions on BWC follows the sequence: activation temperature,amount of additive and activation time.Higher temperature and more additive increase mesoporosity,and the BWC of AC is obviously positively-related with its mesopore volume,meanwhile affected by its micropore surface and total volume.The AC's first desorption rate of butane is about 60%,and after one adsorption-desorption cycle,the desorption rate is above 95%.