煤炭转化2024，Vol.47Issue(1)：49-59,11.DOI:10.19726/j.cnki.ebcc.202401006
基于响应曲面法优化氮掺杂活性炭的制备和CO2吸附性能研究
Optimization of preparation of nitrogen-doped activated carbon and CO2 adsorption property based on response surface methodology
摘要
Abstract
The factors affecting the performance of nitrogen-doped activated carbon dur-ing its preparation process are extremely complex.The qualitative analysis of a single factor can-not satisfy the accurate control of preparation conditions,while the multi-factor coupled quantita-tive analysis can make up for the deficiency.In this study,with the help of KOH activation method,nitrogen-doped activated carbon was prepared by co-pyrolysis with urea using coal tar pitch as raw material.The response surface methodology(RSM)was used for modeling to quan-titatively analyze the coupled effects of multi-factor on the yield of activated carbon and its CO2 adsorption performance at different temperatures(25℃,50℃ and 75℃).Simultaneously,op-timal preparation process parameters were determined.Based on the experimental design,linear fitting method was utilized to predict the correlation of CO2 adsorption capacities at different tem-peratures.The results show that the relative influence of single-factor on the yield of activated carbon follows the order from large to small:nitrogen doping ratio(mass ratio of urea to coal tar pitch),activation temperature,alkali-to-carbon ratio(mass ratio of KOH to coal tar pitch),acti-vation time,and the coupled effect of activation temperature and time is the most significant.The alkali-to-carbon ratio is the most critical factor affecting the CO2 adsorption capacity of the activated carbon.However,the significance of other factors increases notably with rising adsorp-tion temperatures.The CO2 adsorption capacities at different temperatures can be mutually pre-dicted,and the predictive effect between the CO2 adsorption capacities at adjacent temperatures is better.The optimum preparation conditions obtained are as follows:activation temperature of 650℃,activation time of 1.25 h,alkali-to-carbon ratio of 2.5,and nitrogen doping ratio of 0.3.Accordingly,the yield of activated carbon is 59.316％,and the CO2 adsorption capacities at 25℃,50℃ and 75℃ are 3.474 mmol/g,2.355 mmol/g and 1.358 mmol/g,respectively.关键词
响应曲面法/优化/活性炭/产率/CO2吸附性能Key words
response surface methodology/optimize/activated carbon/yield/CO2 ad-sorption property分类
资源环境引用本文复制引用
黄玉,方梦祥,余鹏,吕通,岑建孟,夏芝香..基于响应曲面法优化氮掺杂活性炭的制备和CO2吸附性能研究[J].煤炭转化,2024,47(1):49-59,11.基金项目
国家自然科学基金项目(U1910201)和中央高校基本科研业务费项目(2022ZFJH04). （U1910201）
