In Situ Spectroscopic and Computational Studies on a MnO2–CuO Catalyst for Use in Volatile Organic Compound Decomposition
| Autor: | Minho Joo, Nodo Lee, Kye Yeop Kim, Yong Kim, Seung Kyu Moon, Dong Baek Kim, Young Hwan Min, Eunkyung Cho, Jonghyun Oh, Satoshi Sato, Sangyoon Kim, Jungpil Kim, Gitaeg Jeong, Jun Kim |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Chemistry
General Chemical Engineering Propylene glycol methyl ether acetate Inorganic chemistry chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Decomposition Oxygen XANES Article 0104 chemical sciences Catalysis lcsh:Chemistry chemistry.chemical_compound Chemical state lcsh:QD1-999 Moiety 0210 nano-technology Spectroscopy |
| Zdroj: | ACS Omega ACS Omega, Vol 2, Iss 10, Pp 7424-7432 (2017) |
| ISSN: | 2470-1343 |
| Popis: | In situ near-edge X-ray absorption fine structure (NEXAFS) spectroscopy and density functional theory calculations were conducted to demonstrate the decomposition mechanism of propylene glycol methyl ether acetate (PGMEA) on a MnO2–CuO catalyst. The catalytic activity of MnO2–CuO was higher than that of MnO2 at low temperatures, although the pore properties of MnO2 were similar to those of MnO2–CuO. In addition, whereas the chemical state of MnO2 remained constant following PGMEA dosing at 150 °C, MnO2–CuO was reduced under identical conditions, as confirmed by in situ NEXAFS spectroscopy. These results indicate that the presence of Cu in the MnO2–CuO catalyst enables the release of oxygen at lower temperatures. More specifically, the released oxygen originated from the Mn–O–Cu moiety on the top layer of the MnO2–CuO structure, as confirmed by calculation of the oxygen release energies in various oxygen positions of MnO2–CuO. Furthermore, the spectral changes in the in situ NEXAFS spectrum of MnO2–CuO following the catalytic reaction at 150 °C corresponded well with those of the simulated NEXAFS spectrum following oxygen release from Mn–O–Cu. Finally, after the completion of the catalytic reaction, the quantities of lactone and ether functionalities in PGMEA decreased, whereas the formation of C=C bonds was observed. |
| Databáze: | OpenAIRE |
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