Study on the effects of carrier and modifier on mercury adsorption behavior over halides modified sorbents using temperature programmed desorption method
Study on the effects of carrier and modifier on mercury adsorption behavior over halides modified sorbents using temperature programmed desorption method
复制标题
程序升温脱附法研究载体和改性剂对卤化物改性吸附剂吸附汞行为的影响
DOI：
10.1016/j.fuproc.2018.06.008
复制
发表时间：
2018-09
影响因子：
7.5
通讯作者：
Yao Hong
中科院分区：
文献类型：
--
作者：
Xu Yang;Zeng Xiaobo;Luo Guangqian;Xu Yongqing;Li Xian;Yao Hong
卤化物改性吸附剂喷射除尘装置被认为是燃煤烟气中最有前途的单质汞（Hg0）去除技术。然而，不同卤化物改性吸附剂对hg0的吸附行为仍存在争议。本研究采用程序升温解吸法（TPD）研究了载体（活性炭和中性Al2O3）和改性剂（NaCl、NaBr、CuCl2和CuBr2）对改性吸附剂吸附hg0行为的影响。在固定床上进行了汞吸附实验和TPD实验。结果表明，由于CuBr2的键能较低，CuBr2修饰活性炭（AC）的除汞性能最好。在AC上生成的汞化合物的分解温度与在中性Al2O3上产生的汞化合物的分解温度不同。进一步分析表明，键能较低的改性剂可以在改性过程中释放卤素。释放出的卤素可与AC反应形成活性c单键cl或c单键dbr基团。此外，改性剂的键能较低，使卤素更容易释放。但在改性过程中，al2o3载体不能与改性剂反应形成活性基团。改性al2o3对hg0的吸附过程可以用Langmuir-Hinshelwood机理来解释。
Halides modified sorbents injection equipped with dust removal units is considered as the most promising technology for elemental mercury (Hg0) removal from coal-fired flue gas. However, Hg0adsorption behavior over different halides modified sorbents remains controversial. In this study, the effects of carriers (activated carbon and neutral Al2O3) and modifiers (NaCl, NaBr, CuCl2, and CuBr2) on the behavior of Hg0adsorption over modified sorbents were investigated using temperature programmed desorption (TPD) method. Both mercury adsorption experiments and TPD experiments were conducted in the bench-scale fixed bed. The results indicated that CuBr2-modified activated carbon (AC) showed the best mercury removal performance due to the lower bond energy of CuBr2. The decomposition temperature of mercury compounds generated on AC was different from that on neutral Al2O3. Further analysis indicated that the modifiers with lower bond energy could release halogens during modification. The released halogens could react with AC to form active Csingle bondCl or Csingle bondBr group. Moreover, the lower bond energy of modifiers made it easier for halogens to release. But Al2O3carrier could not react with modifiers to form active group during modification. The Hg0adsorption process over modified Al2O3could be explained by Langmuir-Hinshelwood mechanism.
登录
查看更多内容
DOI：
10.1080/10473289.1999.10463975
发表时间：
1999
影响因子：
2.7
作者：
通讯作者：
--
影响因子：
2.8
作者：
Jing-feng He;C. Duan;Mingzhe Lei;Xuemei Zhu
通讯作者：
Jing-feng He;C. Duan;Mingzhe Lei;Xuemei Zhu
碘化钾浸渍海藻生物炭去除元素汞
影响因子：
15.1
作者：
Liu, Ziyang;Yang, Wei;Liu, Yangxian
通讯作者：
Liu, Yangxian
中国人为源大气汞排放清单更新
影响因子：
11.4
作者：
Zhang, Lei;Wang, Shuxiao;Liu, Xiang
通讯作者：
Liu, Xiang
影响因子：
7.4
作者：
Wei Yang;Ziyang Liu;Wen Xu;Yangxian Liu
通讯作者：
Wei Yang;Ziyang Liu;Wen Xu;Yangxian Liu