不同的MnO2晶体结构的固有热再生性能，用于除汞。,Journal of Hazardous Materials

当前位置： X-MOL 学术 › J. Hazard. Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

不同的MnO2晶体结构的固有热再生性能，用于除汞。
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2019-04-03 , DOI: 10.1016/j.jhazmat.2019.04.006
Ting Yao ₁ , Yufeng Duan ₂ , Teresa M Bisson ₃ , Rajender Gupta ₃ , Deepak Pudasainee ₃ , Chun Zhu ₂ , Zhenghe Xu ₄

Affiliation

研究了具有不同晶体结构的锰氧化物用于气相除汞的方法。研究了α-和γ-MnO2的固有热再生性能及机理。发现即使暴露了120分钟的汞后，二氧化锰的除汞效率仍高于96％，除了β-MnO2去除的汞比Mn2O3少得多。与γ-MnO2相比，发现α-MnO2具有更高的汞捕集再循环能力和更好的再生耐久性。在暴露的前1小时内，在5个再生周期中，α-MnO2的汞容量极佳，为128μg/ g。而对于γ-MnO2，第五个循环的汞容量降低到68.74μg/ g，远低于第一个循环的131.42μg/ g。由于其保留晶格氧的能力，α-MnO2的微观结构在整个再生循环中得以保持。相比之下，由于再生过程中晶格氧的损失，由于氧空位引起的γ-MnO2经历了重构和相变，导致汞捕获能力下降。人们发现，α-MnO2定向复合材料可以更好地发展为可再生的催化吸附剂，用于从燃煤电厂的烟道气中去除汞。

"点击查看英文标题和摘要"

Inherent thermal regeneration performance of different MnO2 crystallographic structures for mercury removal.

Manganese oxides with different crystallographic structures were investigated for gas-phase elemental mercury removal. The inherent thermal regeneration performance and mechanism of α- and γ-MnO2 were studied. The manganese dioxides were found to possess a mercury removal efficiency of higher than 96% even after 120 min mercury exposure except for β-MnO2 which removed much less mercury than Mn2O3. The α-MnO2 was found to have a higher recyclability of mercury capture and better durability for regeneration than γ-MnO2. During the first 1 h of exposure, α-MnO2 showed an excellent mercury capacity of 128 μg/g over 5 regeneration cycles. While for γ-MnO2, the mercury capacity of the fifth cycle was reduced to 68.74 μg/g, which is much lower than 131.42 μg/g for the first cycle. The microstructure of α-MnO2 was maintained throughout regeneration cycles due to its capability to retain lattice oxygen. In comparison, γ-MnO2 experienced reconstruction and phase transformation induced by oxygen vacancies due to lattice oxygen loss during regeneration process, leading to a degradation in mercury capture. The α-MnO2 oriented composite was found to be better developed into a regenerable catalytic sorbent for mercury removal from flue gases of coal-fired power plants.

更新日期：2019-04-03

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南