摘要
首次将炭载型ＣｕＯ／ＡＣ用于烟气脱硫，在最经济的烟气脱硫温度窗口（１２０～２５０℃）显示出高的脱硫活性．考查了煅烧温度和煅烧后脱硫剂的预氧化对脱硫活性的影响，并对脱硫剂进行了ＴＰＤ和ＥＸＡＦＳ表征．结果表明：经２５０℃煅烧的ＣｕＯ／ＡＣ脱硫剂具有最高的脱硫活性．２００℃煅烧，前驱体Ｃｕ（ＮＯ３）２未完全分解；高于２５０℃煅烧，活性组分ＣｕＯ被载体Ｃ部分还原为金属Ｃｕ 微晶，从而发生烧结、聚集，以上均导致脱硫剂活性的下降．尽管不同温度煅烧的ＣｕＯ／ＡＣ表现出大的脱硫活性差异，但吸硫后均生成同一反应产物ＣｕＳＯ４．２５０℃煅烧的ＣｕＯ／ＡＣ脱硫剂Ｃｕ 以ＣｕＯ和Ｃｕ２Ｏ形态存在。
Novel CuO/AC sorbents were prepared for flue gas SO x removal and showed high DeSO x activity at temperatures of 120～250℃ Influences of calcination temperature and preoxidization after calcination on the DeSO x activity were investigated The results showed that the sorbent calcinated at 250℃ was mostly active Calcination temperature of 200℃ may be too low to allow the complete decomposition of the impregnated copper nitrate The low activity for the sorbents calcinated at the temperatures of higher than 250℃ may be attributed to over reduction by carbon and to aggregation of Cu,as evidenced by EXAFS results Although DeSO x activity of the CuO/AC sorbents varies significantly with calcination temperatures,TPD experiments showed that the sorbents convert to the same copper species CuSO 4 in SO 2 absorption After calcination at 250℃,the copper exists in the form of CuO and Cu 2O,and Cu 2O can be easily converted into CuO in flue gas environment
出处
《环境科学》
EI
CAS
CSCD
北大核心
2000年第1期12-17,共6页
Environmental Science
基金
国家自然科学基金
关键词
CuO/AC
脱硫剂
煅烧
烟气脱硫
吸附
废气处理
CuO/AC sorbent,desulphurization,preparation,calcination,characterization,EXAFS,TPD
