Influence of NOx on the activity of Pd/theta-Al2O3 catalyst for methane oxidation: Alleviation of transient deactivation
文献类型：期刊论文
| 作者 | Cui, Chang; Zhang, Yan ; Shan, Wenpo; Yu, Yunbo; He, Hong
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| 刊名 | JOURNAL OF ENVIRONMENTAL SCIENCES
 |
| 出版日期 | 2022-02 |
| 卷号 | 112期号:0页码:38-47 |
| 关键词 | PALLADIUM CATALYSTS LOW-TEMPERATURE COMBUSTION PD/AL2O3 ALUMINA GAS INHIBITION PROMOTION DIOXIDE WATER |
| ISSN号 | 1001-0742 |
| 英文摘要 | Alumina supported Pd catalyst (Pd/Al2O3) is active for complete oxidation of methane, while often suffers transient deactivation during the cold down process. Herein, heating and cooling cycle tests between 200 and 900 degrees C and isothermal experiments at 650 degrees C were conducted to investigate the influence of NOx on transient deactivation of Pd/theta-Al2O3 catalyst during the methane oxidation. It was found that the co-fed of NO alleviated transient deactivation in the cooling ramp from 800 to 500 degrees C, which was resulted from the in situ formation of NO2 during the process of methane oxidation. Over the Pd/Al2O3, thermogravimetric analysis and O-2 temperature programmed oxidation measurements confirmed that transient deactivation was due to the decomposition of PdO particles and the hysteresis of Pd reoxidation, while the metal Pd entities were less active for methane oxidation than the PdO ones. CO pulse chemisorption and scanning transmission electron microscopy characterizations rule out the NO2 effect on Pd size change. Powder X-ray diffraction and X-ray photoelectron spectroscopy characterizations were used to obtain palladium status of Pd/theta-Al2O3 before and after reactions, indicating that in lean conditions at 650 degrees C, the presence of NO2 increases the content of active PdO on the catalyst surface, thus benefits methane oxidation. Homogeneous reaction between CH4, O-2, and NOx may be partially responsible for the alleviation above 650 degrees C. The interesting research of alleviation in transient deactivation by NOx, the components co-existing in exhausts, are of great significance for the application. (C) 2021 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V. |
| 源URL | [https://ir.rcees.ac.cn/handle/311016/47412]  |
| 专题 | 生态环境研究中心_大气污染控制中心 |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Ctr Excellence Reg Atmospher Environm, Xiamen 361021, Peoples R China 3.Chinese Acad Sci, Inst Urban Environm, Key Lab Urban Pollutant Convers, Xiamen 361021, Peoples R China 4.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100085, Peoples R China 5.Chinese Acad Sci, Ningbo Res Ctr Urban Environm, Ningbo 315800, Peoples R China |
| 推荐引用方式 GB/T 7714 | Cui, Chang,Zhang, Yan,Shan, Wenpo,et al. Influence of NOx on the activity of Pd/theta-Al2O3 catalyst for methane oxidation: Alleviation of transient deactivation[J]. JOURNAL OF ENVIRONMENTAL SCIENCES,2022,112(0):38-47. |
| APA | Cui, Chang,Zhang, Yan,Shan, Wenpo,Yu, Yunbo,&He, Hong.(2022).Influence of NOx on the activity of Pd/theta-Al2O3 catalyst for methane oxidation: Alleviation of transient deactivation.JOURNAL OF ENVIRONMENTAL SCIENCES,112(0),38-47. |
| MLA | Cui, Chang,et al."Influence of NOx on the activity of Pd/theta-Al2O3 catalyst for methane oxidation: Alleviation of transient deactivation".JOURNAL OF ENVIRONMENTAL SCIENCES 112.0(2022):38-47. |
入库方式： OAI收割
来源：生态环境研究中心
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