Evidence for Exchange Coupled Electrons and Holes in MgO after Oxidative Activation of CH4: A Multifrequency Transient Nutation EPR Study
文献类型：期刊论文
| 作者 | Schloegl, R.2; Dinse, K-P.3; Schwach, P.2,4; Eichelbaum, M.2; Risse, T.1 |
| 刊名 | JOURNAL OF PHYSICAL CHEMISTRY C
 |
| 出版日期 | 2016-02-25 |
| 卷号 | 120期号:7页码:3781-3790 |
| ISSN号 | 1932-7447 |
| DOI | 10.1021/acs.jpcc.5b11057 |
| 文献子类 | Article |
| 英文摘要 | The effective spin of paramagnetic centers generated during the reaction of a mixture of CH4 and O-2 on activated MgO was determined with transient nutation EPR (TN-EPR). For the first time it could be shown that apart from the generation of surface-trapped superoxide radicals O-2(-), a significant number of paramagnetic centers are formed with an effective spin larger than 1/2. Results from HYSCORE and other pulsed EPR experiments further give evidence that these centers are localized at the surface of the MgO catalyst. These centers are proposed to be exchange coupled clusters of holes and electrons, respectively, some of them formed at specific exposed sites of the highly structured MgO surface. Judging from the relative high concentration of the centers ascribed to hole clusters, it is tempting to assume that they are involved in the catalytic reaction network of the oxidative coupling of methane. |
| WOS关键词 | PARAMAGNETIC-RESONANCE EPR ; MAGNESIUM-OXIDE ; ACTIVE-SITES ; STRUCTURE SENSITIVITY ; POLYCRYSTALLINE MGO ; SUPEROXIDE IONS ; FREQUENCY EPR ; DEFECT SITES ; SPIN DIPOLAR ; DOPED MGO |
| WOS研究方向 | Chemistry ; Science & Technology - Other Topics ; Materials Science |
| 语种 | 英语 |
| WOS记录号 | WOS:000371104400024 |
| 出版者 | AMER CHEMICAL SOC |
| 源URL | [http://cas-ir.dicp.ac.cn/handle/321008/171268]  |
| 专题 | 大连化学物理研究所_中国科学院大连化学物理研究所 |
| 通讯作者 | Dinse, K-P. |
| 作者单位 | 1.Free Univ Berlin, Inst Chem & Biochem, D-14195 Berlin, Germany 2.Max Planck Gesell, Fritz Haber Inst, Dept Inorgan Chem, Faradayweg 4-6, D-14195 Berlin, Germany 3.Free Univ Berlin, Dept Phys, Arnimallee 14, D-14195 Berlin, Germany 4.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China |
| 推荐引用方式 GB/T 7714 | Schloegl, R.,Dinse, K-P.,Schwach, P.,et al. Evidence for Exchange Coupled Electrons and Holes in MgO after Oxidative Activation of CH4: A Multifrequency Transient Nutation EPR Study[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2016,120(7):3781-3790. |
| APA | Schloegl, R.,Dinse, K-P.,Schwach, P.,Eichelbaum, M.,&Risse, T..(2016).Evidence for Exchange Coupled Electrons and Holes in MgO after Oxidative Activation of CH4: A Multifrequency Transient Nutation EPR Study.JOURNAL OF PHYSICAL CHEMISTRY C,120(7),3781-3790. |
| MLA | Schloegl, R.,et al."Evidence for Exchange Coupled Electrons and Holes in MgO after Oxidative Activation of CH4: A Multifrequency Transient Nutation EPR Study".JOURNAL OF PHYSICAL CHEMISTRY C 120.7(2016):3781-3790. |
入库方式： OAI收割
来源：大连化学物理研究所
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