竹材微正压热解自活化制备高吸附性能活性炭的机制研究  

Self-activation Mechanism for Preparation of Bamboo Derived High Performance Activated Carbon Under Micro-posotive Pressure

作　　者：孙昊 孙康[1,2,3] 蒋剑春 许伟[1,2] 张燕萍[1,2] SUN Hao;SUN Kang;JIANG Jianchun;XU Wei;ZHANG Yanping(Institute of Chemical Industry of Forest Products,CAF,National Engineering Lab. for Biomass Chemical Utilization, Key Lab. of Chemical Engineering of Forest Products,National Forestry and Grassland Administration,Key Lab. of Biomass Energy and Material,Jiangsu Province, Nanjing 210042, China;Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources,Nanjing Forestry University, Nanjing 210037, China;ResearchInstitute of Forestry New Technology,CAF, Beijing 100091, 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,江苏南京210042 [2]南京林业大学江苏省林业资源高效加工利用协同创新中心,江苏南京210037 [3]中国林业科学研究院林业新技术研究所,北京100091

出　　处：《林产化学与工业》2019年第5期19-25,共7页Chemistry and Industry of Forest Products

基　　金：江苏省生物质能源与材料重点实验室基本科研业务费项目(JSBEM-S-201910)

摘　　要：以竹材加工剩余物为原料,在不添加活化剂的条件下,开展了微正压热解自活化制备活性炭的研究,通过热重-质谱分析、热解炭化和热解自活化对比,以及热解自活化尾气监测,探究热解过程中活性炭孔隙结构的形成机制。研究结果发现:热解过程产生的水蒸气和二氧化碳可以与固相炭发生气化成孔反应,制得高吸附性能的竹材活性炭;热解气体、均匀活化、气-炭可逆反应平衡状态、活化剂的扩散速率及气-炭反应速率是竹材活性炭孔隙结构和吸附性能的主要影响机制;控制热解自活化压力为0.12MPa,在900℃(升温速率15℃/min)热解6h,制得活性炭得率为15.22%,BET比表面积(SBET)1108m^2/g,微孔容积(Vmic)为0.407cm^3/g,介孔容积(Vmes)为0.085cm^3/g,碘和亚甲基蓝的吸附值分别为1438和300mg/g,同时副产高H2、CO含量和高CO/CO2比例的费托合成原料气。The preparation of activated carbon was carried out using bamboo as material via pyrolysis self-activation under micro- positive pressure without activating agent. The pore formation mechanism of activated carbon was investigated based on its structural characterization and adsorption properties. The results showed that the generated CO 2 and H 2 O could react with solid carbon to prepare activated carbon with high adsorption performance during the pyrolysis process. The main influences on pore structure and adsorption properties of bamboo activated carbon were the pyrolysis gas, humogeneous activation, equilibrium state of gas-carbon reversible reaction, diffusion rate of activator and gas-carbon reaction rate. The activated carbon was prepared under the pyrolysis self-activation of bamboo 0. 12 MPa at 900 ℃(15 ℃/ min heating rate) for 6 h. The yield of the product was 15. 22% with the BET specific surface area(S BET ), micropore volume(V mic ), mesopore volume(V mes ), iodine value and methylene blue (MB) value of activated carbon were 1 108 m^2 / g, 0. 407 cm^3 / g, 0. 085 cm^3 / g, 1 438 mg/ g and 300 mg/ g, respectively. Moreover, the gas by-product of self-activation contained high concentration of H 2 and CO and exhibited a high ratio of CO to CO 2 , which could be raw materials for Fischer-Tropsch reaction.

关 键 词：竹活性炭 自活化 微正压 调控机制 

分 类 号：TQ35[化学工程]