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- Title
Hg 0 Removal by a Palygorskite and Fly Ash Supported MnO 2 -CeO 2 Catalyst at Low Temperature.
- Authors
Wang, Junwei; Jiang, Caihong; Shi, Liming; Xue, Zhifeng; Wang, Xie; Xu, Can; Zhang, Xianlong; Zhang, Jianli
- Abstract
MnO2-CeO2/PG-FA catalysts were prepared by supporting MnO2-CeO2 to PG-FA and used to remove Hg0 in simulated flue gas. The results show that MnO2-CeO2/PG-FA catalyst had excellent and stable Hg0 removal activity, which was mainly due to the combination effect of the catalytic oxidation activity by MnO2-CeO2 and the adsorption ability by PG-FA. Mn8-Ce0.5/PG-FA (with 8.0% MnO2 and 0.5% CeO2 loading) catalyst showed the highest Hg0 removal efficiency at 140 °C and Hg0 removal efficiency could be maintained above 95% with the space velocity of 6000 h−1 and Hg0 concentration of 160 μg/m3. O2 promoted Hg0 removal by MnO2-CeO2/PG-FA catalyst, while SO2 and H2O had inhibitory effects. In the presence of O2, the inhibitory effect of SO2 and H2O can be obviously weakened. MnO2-CeO2/PG-FA catalysts were characterized with scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and temperature-programmed desorption experiments (TPD). The results of SEM and XRD showed that the active components MnO2-CeO2 dispersed well on the surface of PG-FA support. The results of XPS and TPD show that the Hg0 removal process over MnO2-CeO2/PG-FA catalyst included adsorption and oxidation, HgO and HgSO4 were generated and adsorbed on the catalyst. MnO2-CeO2/PG-FA catalyst also showed excellent regeneration performance after Hg0 removal.
- Subjects
FLY ash; MERCURY; PALYGORSKITE; LOW temperatures; X-ray photoelectron spectroscopy; CATALYSTS
- Publication
Catalysts (2073-4344), 2022, Vol 12, Issue 6, pN.PAG
- ISSN
2073-4344
- Publication type
Article
- DOI
10.3390/catal12060662