磷酸活化提升丁烷工作容量并制备高性能汽车碳罐用活性炭  

Preparation of activated carbon with high butane work capacity for automobile carbon canister by phosphoric acid activation

作　　者：许伟[1] 刘军利[1] 应浩[1] 孙康[1] 郭奇 张艳萍 XU Wei;LIU Junli;YING Hao;SUN Kang;GUO Qi;ZHANG Yanping(Institute of Chemical Industry of Forest Products,Chinese Academy of Forestry/National Engineering Lab.for Biomass Chemical Utilization/Key Lab.of Forest Chemical Engineering,National Forestry and Grassland Administration/Key Lab.of Biomass Energy and Material,Jiangsu Province/Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources,Nanjing 210042,China)

机构地区：[1]中国林业科学研究院林产化学工业研究所,生物质化学利用国家工程实验室,国家林业和草原局林产化学工程重点实验室,江苏省生物质能源与材料重点实验室,江苏省林业资源高效加工利用协同创新中心,南京210042

出　　处：《环境工程学报》2021年第6期1946-1955,共10页Chinese Journal of Environmental Engineering

基　　金：国家重点基础研究发展计划项目(2017YFD0601006)。

摘　　要：为满足汽车国六排放标准,以木屑为原料、磷酸为活化剂,制备了碳罐用高丁烷工作容量成型活性炭。在制备过程中通过烘焙提质、粒度调控对原料进行预处理,并采用了真空捏合、模孔设计、高温活化等工艺。考察了烘焙温度、原料粒度、浸渍比、真空捏合时间、活化温度、活化时间等制备条件对活性炭性能的影响。结果表明:原料经250℃烘焙、破碎至粒度小于0.2 mm及使用孔径为2.5 mm的模具成型,可明显提高制备活性炭的性能;当磷酸与原料浸渍比为1.5∶1,真空捏合为60 min、活化温度为500℃、活化时间为120 min时,制备的活性炭碘吸附值为1028 mg·g^(-1)、亚甲基蓝吸附值为270 mg·g^(-1)、强度为92.4%、丁烷工作容量为152 g·L^(-1)、BET比表面积为1547.63 m^(2)·g^(-1),性能可达到碳罐用活性炭TGZ1500指标要求。To meet the requirements of the China’s stage 6 vehicle emission standards,high butane working capacity formed activated carbon was prepared with sawdust as raw material and phosphoric acid as activator.The sawdust was pretreated by torrefaction-upgrading and particle size control.Vacuum kneading,mold hole design,high temperature activation and other processes were used to produce the activated carbon.The effects of torrefaction temperature,particle size of raw materials,impregnation ratio,vacuum kneading time,activation temperature and activation time on the properties of activated carbon were investigated.Results showed that the properties of activated carbon could be significantly improved when the raw materials were torrefied at 250℃,crushed to a particle size less than 0.2 mm and molded by a mold with a pore diameter of 2.5 mm.The requirements by the TGZ1500 index of activated carbon for automobile carbon canister can be met with a impregnation ratio of 1.5∶1,vacuum kneading time of 60 min,activation temperature of 500℃ and activation time of 120 min.Under these conditions,iodine adsorption value of the prepared activated carbon was1028 mg·g^(-1),and the optimized properties were obtained including methylene blue adsorption value of270 mg·g^(-1),strength of 92.4%,butane work capacity of 152 g·L^(-1),and BET specific surface area of 1548 m2·g^(-1).

关 键 词：活性炭 烘焙提质 磷酸活化 丁烷工作容量 

分 类 号：TQ35[化学工程] TQ424