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| 高活性Pd-Fe催化剂对CO的低温氧化性能研究 |
| The Study of Highly Active Pd-Fe Catalysts for Low Temperature CO Oxidation Reaction |
| Received:October 16, 2017 |
| DOI： |
| 中文关键词: 催化化学 Pd-Fe 炭载体 CO氧化 活性位 煅烧 强相互作用 |
| 英文关键词: catalytic chemistry Pd-Fe carbon black support CO oxidation active sites calcination strong interaction |
| 基金项目:国家自然科学基金(21403004、21403003)。 |
| Author Name | Affiliation | E-mail | | FAN Guohong | School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan 243002, Anhui, China | ghfan8@ahut.edu.cn | | LI Long | School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan 243002, Anhui, China | | | NI Ke | School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan 243002, Anhui, China | | | XU Hong | School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan 243002, Anhui, China | xuhfgh@163.com |
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| 中文摘要: |
| 用共沉淀法制得Pd-Fe催化剂，考察了煅烧温度、载体、金属担载量对CO低温催化氧化反应活性的影响。结果表明，负载在炭黑上的Pd-Fe催化剂经200℃和300℃煅烧，性能最佳，在室温下可将CO完全转化。采用透射电镜(TEM)、X射线光电子能谱(XPS)、X射线粉末衍射(XRD)和CO化学吸附表征发现，催化剂的高活性是由于Pd与Fe之间具有强相互作用，导致Pd向界面Fe3+(Fe2O3)进行电子转移，形成还原态的Fex+物种。PdO和还原态的Fex+物种分别是吸附CO和O2的活性中心，成为CO氧化高活性的主要原因。 |
| 英文摘要: |
| Pd-Fe catalysts were prepared via the co-precipitation technique. Effects of calcination temperature, support, metal loading amount on the catalytic performances of CO oxidation were investigated. After calcined at 200℃ or at 300℃,Pd-Fe supported on carbon black displayed the best catalytic activity and could completely oxidize CO at room temperature. Detailed characterization was carried out by using transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray powder diffraction and CO chemisorption. Results revealed that the high activity could be attributed to the strong interaction between palladium and iron. This interaction would lead to the electron transfer from Pd to the interfacial Fe3+ (Fe2O3), forming the reduced Fex+ sites. PdO and reduced Fex+ sites acted as the adsorption centers for CO and O2, respectively, which is the main reason for the superior performance of Pd-Fe catalysts for CO oxidation. |
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