化学性质对活性炭脱硫的影响  

Effect of chemical properties on SO_2 removal by activated carbons

作　　者：刘少俊[1,2] 高翔[2] 曹飞飞[2] 

机构地区：[1]江苏科技大学能源与动力工程学院,江苏镇江212003 [2]浙江大学能源清洁利用国家重点实验室,浙江杭州310027

出　　处：《煤炭学报》2013年第7期1242-1247,共6页Journal of China Coal Society

基　　金：国家杰出青年科学基金资助项目(51125025);江苏省高校自然科学研究面上资助项目(12KJB470005);国家科技支撑计划资助项目(2011BAA04B08)

摘　　要：运用工业与元素分析、能谱分析(EDS)及CO/CO2程序升温脱附(CO/CO2-TPD)等多种表征手段,结合SO2的吸附脱附测试,研究化学性质对活性炭脱硫的影响。从CO,CO2的析出曲线可以发现,对于生物质原料(椰壳)制成的活性炭,表面形成的含氧官能团以羧酸、酚、羰基、醌为主;对于煤质活性炭,表面含氧官能团以内酯、酚、羰基、醌为主。这些官能团对SO2吸附的影响各不相同,炭表面分解产物为CO2的官能团(羧酸、内酯)对SO2吸附量的增加有抑制作用,而分解产物为CO的官能团(酚、羰基、醌)的作用并不明显。脱附实验结果表明,活性炭吸附的SO2很难完全脱附,SO2的残留量与样品的灰分含量有关,灰分中的成分会与SO2发生相互作用,导致部分SO2在脱附时无法析出而残留在活性炭中。This paper investigated the effect of chemical properties of activated carbons（ACs） on SO2 removal activity. Carbons were characterized by various techniques including proximate and ultimate analysis, energy dispersive spec trometer（EDS） and CO/CO2 temperature programmed desorption （CO/CO2TPD）. Results show that the different chemical properties of ACs are derived from the different precursors. ACs produced from biomass precursors contain more carboxylic, phenol, carbonyl and quinone functional groups, while ACs from coal precursors mainly include ester, phenol, carbonyl and quinone groups. On the other hand, the different chemical properties have different impacts on SO2 removal activities. The CO2forming groups such as carboxylic and ester over the surface suppress the SO2 adsorp tion capacity,while the effect of the COforming groups such as phenol, carbonyl and quinone is not obvious. The ash content of ACs also shows a correlation with the desulfurizing property of ACs,which results in some SO2 retained on the carbon surface after the desorption.

关 键 词：化学性质 脱硫 活性炭 含氧官能团 

分 类 号：TQ424.1[化学工程]