The role of adsorbed oxygen in formic acid oxidation by Pt/TiO2 facilitated by light pre-treatment
| Autor: | Gary K.-C. Low, Nathania Ganda, Jason Scott, Wibawa Hendra Saputera, Rose Amal |
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| Rok vydání: | 2016 |
| Předmět: |
Pre treatment
Chemistry Formic acid Inorganic chemistry chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Oxygen Catalysis Formic acid oxidation 0104 chemical sciences law.invention chemistry.chemical_compound Adsorption X-ray photoelectron spectroscopy law mental disorders 0210 nano-technology Electron paramagnetic resonance |
| Zdroj: | Catalysis Science & Technology. 6:6679-6687 |
| ISSN: | 2044-4761 2044-4753 |
| DOI: | 10.1039/c6cy00939e |
| Popis: | Our study demonstrates that adsorbed oxygen species on Pt surfaces (PtOads) and active oxygen species (O−ads) play a critical role in formic acid oxidation under the ambient condition in an aqueous suspension. The impact of light pre-treatment and dissolved oxygen concentration on the generation of surface oxygen species (PtOads and O−ads) was studied using X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR). A strong correlation between the formic acid oxidation rate and the surface oxygen species was observed. Light pre-treatment introduced a greater amount of PtOads and O−ads compared with the untreated Pt/TiO2 and, as a result, invoked an almost seven-fold increase in the formic acid oxidation rate. The amount of surface oxygen species was found to increase with increasing dissolved oxygen concentration in the system which also accelerated the formic acid oxidation rate. Additionally, the decreasing amount of PtOads at the end of the reaction with increasing initial formic acid concentration suggests that the oxygen species are important to, and consumed during, the oxidation process. |
| Databáze: | OpenAIRE |
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