Effects of microwave regeneration of activated carbon on its SO2 adsorption
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摘要: 研究了脱硫活性炭的微波再生及其对烟气中SO2的循环吸附特性。通过扫描电镜、N2吸附、元素分析、Boehm滴定等表征了微波再生对活性炭孔隙结构和表面化学性质的影响,分析了微波再生对活性炭循环吸附烟气中SO2的影响规律。结果表明,微波再生是脱硫活性炭再生的有效手段,在合适的再生功率下,经过多次循环吸附/再生后,活性炭仍然保持较高的吸附容量,吸附17次后再生活性炭仍然高于原始活性炭,但同时由于再生过程中存在C与H2SO4的反应,活性炭存在明显的烧失现象。初次再生后,活性炭的表面酸性官能团在高温下基本完全分解,碱性官能团含量上升,活性炭的SO2吸附容量明显提高;多次吸附/再生循环后,再生反应起到了活化的作用,使活性炭的孔结构变狭长,微孔比表面积和微孔容积呈上升趋势,同时酸性和碱性官能团基本保持稳定,活性炭的SO2吸附容量逐渐增加。Abstract: The microwave regeneration of SO2 loaded activated carbon (AC) and its circulation adsorption characteristics were studied. The effects of microwave regeneration on the pore texture and surface chemistry of AC were analyzed by SEM, low temperature N2 adsorption, elemental analysis and Boehm titration. The results show that microwave irradiation is an effective regeneration method. In the suitable regenerative power, after many circulation adsorption/regeneration, the AC still remains high adsorption capacity. After 17th circulation, the adsorption capacity of AC is still higher than the primitive AC. Hower, there is obviously weight loss for AC during the regeneration because of the reaction between C and H2SO4. After first regeneration, the surface acidic functional groups of the AC almost decompose at high temperature, and the surface basic functional groups increase, so the SO2 adsorption capacity of AC is enhanced. After several adsorption/regeneration circulations, the surface acidic functional groups and basic functional groups remain stable, while the pore structure of AC becomes long and narrow for the activation of regeneration. And the specific surface area and volume of micropore increase, which benefits the SO2 adsorption on AC.
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Key words:
- activated carbon /
- microwave regeneration /
- pore texture /
- surface functional groups /
- SO2
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