烟气组分对汞吸附影响的程序升温脱附

发布时间：2018-06-22 14:10

本文选题：溴素改性 + 活性炭　；参考：《化工进展》2016年12期

【摘要】：目前燃煤烟气活性炭脱汞技术已经很成熟,但机理方面的相关研究甚少或不全面,为了探讨汞与活性炭在燃煤烟气中的反应路径,本文在固定床上对商业活性炭(FAC)和1%NH4Br改性活性炭(NBAC)进行了汞吸附实验,分别考察了O2、SO_2、CO_2、NO及其混合烟气组分对吸附剂汞吸附的影响,然后利用程序升温脱附(temperature programmed desorption,TPD)技术分析了烟气组分对汞吸附的影响机理。固定床测试结果表明溴化铵改性可显著增加活性炭汞吸附性能,O2、CO_2及NO可促进NBAC对汞的吸附,其中NO最好,而SO_2抑制NBAC对汞的吸附。TPD结果表明,溴素改性促进NBAC表面负载的溴与Hg0结合生成Hg Br2,O2存在促进了Hg0的氧化生成Hg O,NO存在显著增加了Hg2(NO3)2的生成。SO_2与Hg0对活性炭表面的官能团存在竞争吸附的关系,生成C—S,与Hg0反应生成Hg S。CO_2对NBAC吸附Hg0的反应机理影响不大。
[Abstract]:In order to explore the reaction path of mercury and activated carbon in coal-fired flue gas, the technology of mercury removal by activated carbon from coal-fired flue gas is very mature, but there are few or no comprehensive studies on the mechanism. In this paper, commercial activated carbon (FAC) and 1NH4Br modified activated carbon (NBAC) were tested on fixed bed. Then the influence mechanism of flue gas composition on mercury adsorption was analyzed by temperature programmed desorption (temperature programmed desorptiont) technique. The results of fixed bed test show that ammonium bromide modification can significantly increase the adsorption properties of activated carbon mercury. O _ 2O _ 2CO _ 2 and no can promote the adsorption of mercury by NBAC, no is the best, and so _ 2 inhibits the adsorption of mercury by NBAC. The presence of bromine supported on NBAC surface and Hg0 to form Hg Br2O-2 promotes the oxidation of Hg0 and the formation of Hg2 (No3) 2. The existence of Hg2 (No3) 2 increases the relationship between Hg2 (No3) 2 and Hg0 on the surface of activated carbon. The formation of C-Sand Hg S.CO2 by reaction with Hg0 has little effect on the reaction mechanism of Hg0 adsorbed by NBAC.
【作者单位】：东南大学能源热转换及其过程测控教育部重点实验室;
【基金】：国家重点研发计划(2016YFC020115,2016YFB0600604,2016YFB0600203) 国家自然科学基金(51376046,51576044) 江苏省环保科研课题(2016030) 中央高校基本科研业务费专项资金江苏省普通高校研究生科研创新计划(CXZZ13_0093,KYLX_0115,KYLX_0184,KYLX15_0071) 东南大学优秀博士学位论文培育基金(YBJJ1505)项目
【分类号】：X701

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