| 新型低温CuO/AC脱硫剂制备——煅烧温度对脱硫活性的影响 |
| 摘要点击 1762 全文点击 2464 投稿时间：1999-06-14 |
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| 中文关键词 CuO/AC 脱硫剂 制备 煅烧 TPD表征 EXAFS表征 |
| 英文关键词 CuO/AC sorbent,desulphurization,preparation,calcination,characterization,EXAFS,TPD |
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| 中文摘要 |
| 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，其中的Ｃｕ2Ｏ在２００℃很容易氧化成ＣｕＯ |
| 英文摘要 |
| Novel CuO/AC sorbents were prepared for flue gas SOx removal and showed high DeSOx activity at temperatures of 120～250℃ Influences of calcination temperature and preoxidization after calcination on the DeSOx 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 DeSOx activity of the CuO/AC sorbents varies significantly with calcination temperatures,TPD experiments showed that the sorbents convert to the same copper species CuSO4 in SO2 absorption After calcination at 250℃,the copper exists in the form of CuO and Cu2O,and Cu2O can be easily converted into CuO in flue gas environment. |
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