Abstract
Ceria (CeO2)–based materials are potential catalysts for the removal of the Hg0 and AsH3 present in reducing atmospheres. However, theoretical studies investigating the Hg0 and AsH3 removal capacity of ceria remain limited. In this study, the adsorption behavior and mechanistic pathways for the catalytic oxidation of Hg0 and AsH3 on the CeO2(111) surface, including the calculation of optimized adsorption configurations and energies, were investigated using density functional theory calculations. The results suggest that Hg0 and AsH3 are favorably adsorbed on the CeO2(111) surface, whereas CO is not, which is crucial for selective removal when CO is a desirable gas component. Furthermore, AsH3 is adsorbed more favorably than Hg0. In addition, the calculations revealed that the Hg atom is initially adsorbed on the surface and then oxidized by lattice oxygen to form HgO. Concerning AsH3 decomposition, the stepwise dehydrogenation of AsH3 followed by bonding with lattice O atoms to form the As-O bond seems the most plausible. Finally, the adsorbed As-O bond is further forms elemental As and As2O3. Therefore, CeO2 can adsorb and remove Hg0 and AsH3, making it a promising catalyst for the simultaneous catalytic oxidation of Hg0 and AsH3 in strongly reducing off-gas.
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Acknowledgements
The Materials Studio software was supported by the National Supercomputing Center in Shenzhen. The authors would like to thank Shiyanjia Lab (www.shiyanjia.com) for the support of the DFT calculation.
Funding
This work was financially supported by the Basic Research Project of Yunnan Province Science and Technology Department (grant number: 202201AU070004), the National Natural Science Foundation of China (grant number: 51868030, 52070090), the Science and Technology Planning Project of Yunnan Province (grant number: 202001AU070031), and the National Key Research and Development Program of China (grant number: 2018YFC0213400, 2017YFC210500).
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Yingjie Zhang: methodology, writing—original draft preparation, investigation; Huijuan Yu: writing—reviewing and editing; Xueqian Wang: conceptualization, funding acquisition; Langlang Wang: writing—reviewing and editing; Yuancheng Li: investigation, funding acquisition; Dongpeng Lv: data curation; Dan Zhu: validation; Chunmei Tian: writing—reviewing and editing.
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Zhang, Y., Yu, H., Wang, X. et al. Simultaneous catalytic oxidation of elemental mercury and arsine over CeO2(111) surface: a density functional theory study. J Mol Model 28, 156 (2022). https://doi.org/10.1007/s00894-022-05153-4
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DOI: https://doi.org/10.1007/s00894-022-05153-4