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| Ca Doping Effect on the Competition of NH3-SCR and NH3 Oxidation Reactions over Vanadium-Based Catalysts | |
| Zheng, Yang1,2; Guo, Yangyang1; Wang, Jian1; Luo, Lei1; Zhu, Tingyu1 | |
| 2021-03-25 | |
| Source Publication | JOURNAL OF PHYSICAL CHEMISTRY C
 |
| ISSN | 1932-7447 |
| Volume | 125Issue:11Pages:6128-6136 |
| Abstract | The Ca poisoning effect constrains vanadium-based catalysts from further application in high-calcium content flue gas, and the deactivation effect of CaO on V2O5-WO3/TiO2 (VWT) and V2O5/TiO2 (VT) catalysts has been investigated from a new perspective. As the NH3 selective catalytic reduction (NH3-SCR) results showed, the NO conversion at 400 degrees C declined by 71.7% for VT and by 34.8% for VWT after CaO doping, and the decrease in NO conversion for NH3-SCR at temperatures greater than 300 degrees C was mainly caused by the competition of the NH3 oxidation reaction. The characterization of catalysts by NH3-SCR, XRD, Raman spectroscopy, H-2-TPR, NH3-TPD, and TEM showed that the number of surface acid sites decreased and that the oxidation and reduction properties of the catalysts all deteriorated after CaO doping, which is the primary reason for the decrease in NO conversion. CaO also affected NH3 oxidation, and the L-NH3 adsorbed on CaO favored the NH3 oxidation reaction, as DRIFTS showed. NH3 reaction pathways changed by CaO doping because NH3 oxidation becomes more competitive at temperatures greater than 300 degrees C. Density functional theory (DFT) calculations confirmed the NO formation pathway on CaO, and the competition mechanism of NH3-SCR and NH3 oxidation reactions has been described, which has hardly been reported. |
| DOI | 10.1021/acs.jpcc.1c00677 |
| Language | 英语 |
| Funding Project | National Key Research and Development Program of China[2017YFC021080401] ; National Science Foundation of China[51778600] ; Department of Science and Technology of Hebei Province[19273715D] ; National Engineering Laboratory for Flue Gas Pollutants Control Technology and Equipment[NEL-KF-2019017] |
| WOS Research Area | Chemistry ; Science & Technology - Other Topics ; Materials Science |
| WOS Subject | Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary |
| Funding Organization | National Key Research and Development Program of China ; National Science Foundation of China ; Department of Science and Technology of Hebei Province ; National Engineering Laboratory for Flue Gas Pollutants Control Technology and Equipment |
| WOS ID | WOS:000635441700018 |
| Publisher | AMER CHEMICAL SOC |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.ipe.ac.cn/handle/122111/48351 |
| Collection | 中国科学院过程工程研究所 |
| Corresponding Author | Guo, Yangyang; Zhu, Tingyu |
| Affiliation | 1.Chinese Acad Sci, CAS Key Lab Green Proc & Engn, Inst Proc Engn, Innovat Acad Green Manufacture, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| Recommended Citation GB/T 7714 | Zheng, Yang,Guo, Yangyang,Wang, Jian,et al. Ca Doping Effect on the Competition of NH3-SCR and NH3 Oxidation Reactions over Vanadium-Based Catalysts[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2021,125(11):6128-6136. |
| APA | Zheng, Yang,Guo, Yangyang,Wang, Jian,Luo, Lei,&Zhu, Tingyu.(2021).Ca Doping Effect on the Competition of NH3-SCR and NH3 Oxidation Reactions over Vanadium-Based Catalysts.JOURNAL OF PHYSICAL CHEMISTRY C,125(11),6128-6136. |
| MLA | Zheng, Yang,et al."Ca Doping Effect on the Competition of NH3-SCR and NH3 Oxidation Reactions over Vanadium-Based Catalysts".JOURNAL OF PHYSICAL CHEMISTRY C 125.11(2021):6128-6136. |
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