低碳化学与化工2024，Vol.49Issue(11)：63-69,7.DOI:10.12434/j.issn.2097-2547.20240050
基于K循环的KOH活化石油焦制高比表面积活性炭联产氢气
Activation of petroleum coke with KOH based on K recycle to produce high specific surface area activated carbon and co produce hydrogen
摘要
Abstract
The preparation of high specific surface area activated carbon by KOH activation method usually requires a large amount of KOH consumption.In order to improve the utilization efficiency of KOH,a method based on intercalation and de-intercalation of K(hereinafter referred to as"K recycle")for preparing high specific surface area activated carbon and co producing H2from activation of petroleum coke with KOH was developed.During the heating activation process,KOH reacted with carbonaceous raw materials and converted into K,K2O and K2CO3 and produced H2,while K2CO3 can continue to react to generate K and K2O.During the cooling de-intercalation process,water vapour as the de-intercalation reagent was introduced to react with the intercalated K,free state K and K2O to generate KOH and H2.The regenerated KOH can react again with the carbonaceous raw materials during the secondary heating activation process,forming the K recycle.The effects of different carbonaceous raw materials(petroleum coke and graphite),activation agent KOH and its activation intermediate K2CO3 on the gas evolution during activation process and the pore structure properties of activated carbon were investigated in a horizontal boat reactor.Based on this,the K recycle mechanism was analyzed.The results show that the efficiency of K recycle and H2 production vary with the carbonaceous raw materials and activation agents.The reactivity of petroleum coke is much higher than that of graphite,and the activation ability of KOH is better than that of K2CO3.In the activation process of petroleum coke with KOH,the conversion rate of KOH reaches 80％,while that of K2CO3 is only 18.5％,indicating that the efficiency of K recycle is determined by the conversion of K2CO3.With petroleum coke as carbonaceous raw materials and KOH as activation agent,under the conditions of activation temperature 800 ℃ and de-intercalation temperature 250 ℃,4.5 g dried petroleum coke and 13.5 g KOH are subjected to secondary intercalation and de-intercalation,resulting in activated carbon with the specific surface area of 2808 m2/g and co producing 1403 mL/g H2(1403 mL H2 produced by 1 g petroleum coke).关键词
活性炭/石油焦/K循环/KOH/氢气Key words
activated carbon/petroleum coke/K recycle/KOH/hydrogen分类
化学化工引用本文复制引用
王克超,徐绍平,王雯雯,杜利军..基于K循环的KOH活化石油焦制高比表面积活性炭联产氢气[J].低碳化学与化工,2024,49(11):63-69,7.基金项目
国家自然科学基金(21376046). （21376046）
