环境工程学报2017，Vol.11Issue(5)：2933-2939,7.DOI:10.12030/j.cjee.201611026
活性炭和沸石分子筛处理非稳定排放VOCs气体的性能比较
Competitive adsorption and desorption of unsteady emission VOCs on activated carbon and zeolites
摘要
Abstract
The application of two kinds of adsorbents in a fixed bed was studied by comparing the performances of activated carbon and zeolite in discontinuous and unsteady volatile organic compounds (VOCs) emissions with large flow and low concentration conditions through characterization and dynamic adsorption/desorption experiments.The results indicate that the pore size distribution of zeolite was more concentrated,at about 0.8 nm,while the specific surface area was 393.76 m2 · g-1.The pore size distribution of activated carbon was broad,its micro hole was concentrated in 1 to 2 nm,and its specific surface area was 1 026.71 m2 · g-1.The equilibrium adsorption capacity of xylene on activated carbon was generally higher than on zeolite,and the influence of its equilibrium concentration and temperature on the equilibrium adsorption capacity of activated carbon was more powerful than that of zeolite.Dynamic adsorption breakthrough curves indicate that the average transfer rate per mass transfer zone of zeolite was from 1.42 to 1.66 times more than that of activated carbon.The working capacity of activated carbon was larger than that of zeolite under the same adsorption and desorption temperature conditions.Desorption of xylene from zeolite could be accomplished at 210 ℃ to obtain more than 48 times of the concentrat ed gas from desorption.The 50 times adsorption-desorption experiments had little effect on the performance of zeolite.The energy consumption of desorption per kg xylene from zeolite was from 4.2 to 2.9 times of that of activated carbon.Activated carbon and zeolite could be applied for removal of VOCs from low-concentration,large air volume and unsteady emissions by different combined processes.关键词
大风量/低浓度VOCs/非稳定排放/吸附等温线/动态吸附/脱附Key words
large flow/low concentration VOCs/unsteady emission/adsorption isotherm/dynamic adsorption/desorption分类
资源环境引用本文复制引用
李照海,羌宁,刘涛,何娇,曹翌奇,陈皓坤..活性炭和沸石分子筛处理非稳定排放VOCs气体的性能比较[J].环境工程学报,2017,11(5):2933-2939,7.基金项目
上海市科学技术委员会科研计划项目(16dz1206204) （16dz1206204）
