Baodeng Wang,Zhongzheng Zhang,Chenming Zhu,Lina Zhang,Nannan Sun,Wei Wei,Yuhan Sun
Highly dispersed potassium species were introduced on a mesoporous carbon surface following an oxidation and subsequent ion exchange protocol. The samples were characterized and their CO2 adsorption performance was systematically evaluated by both static and dynamic adsorption tests. It was found that the generated surface functionality can be tuned by controlling the reaction temperature and/or using different oxidant(s), and thus potassium species can be introduced in an adjustable way without significant alteration on the textural properties of the samples. Although adsorption at atmospheric pressure was not influenced, low pressure CO2 uptake and adsorption selectivity were considerably enhanced by potassium introduction owing to the highly dispersed potassium species. A high CO2 adsorption capacity of 5.9 wt% was achieved at 25 °C and 0.15 bar with excellent cyclic stability, and the adsorbents can be readily regenerated at 115 °C under N2 purging.
Yongjin Hu,Zhichang Jiang,Runxian Wang,Shujie Gao,Hui Liu,Haining Wang,Dong Ye
In this article, the effects of K species, including K 2 O, KCl, and K 2 SO 4 , on the Hg 0 removal capability of MnO x /HZSM-5 adsorbent were investigated. Adding K 2 O and K 2 SO 4 interfered with the Hg 0 removal process; as the loading amount of these two K species increased, this adverse impact became more obvious. This was because the added K 2 O or K 2 SO 4 lowered the acidity and oxidizability of the adsorbents via the interactions with MnO x , which exerted an inhibitory effect on the adsorption and oxidation of Hg 0 . By contrast, introducing KCl made almost no adverse impacts on the Hg 0 elimination ability of the adsorbents. With rising the KCl content to 4 wt%, even ∼92.7% Hg 0 removal efficiency was obtained. This could be attributed to the presence of Cl − ; with the guidance of high-valence-state metal cations and O 2 , Cl − could be converted to active chlorine species, which was capable of transforming Hg 0 to HgCl 2 . This finding supplied a theoretical basis for developing new adsorbents that were capable of stably operating in the power plants with high-alkali-content coal utilized.
危险品化学品经营许可证（带存储）