Tuning Pt dispersion and oxygen mobility of Pt/γ-Al2O3 by Si addition for CO oxidation
| Autor: | Piyasan Praserthdam, Joongjai Panpranot, Yuthana Hochin, Nutchapon Chotigkrai |
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| Rok vydání: | 2015 |
| Předmět: |
Inorganic chemistry
Doping chemistry.chemical_element 02 engineering and technology Surface reaction 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Oxygen Catalysis 0104 chemical sciences Pt clusters Linear relationship chemistry Dehydrogenation Physical and Theoretical Chemistry 0210 nano-technology Dispersion (chemistry) |
| Zdroj: | Reaction Kinetics, Mechanisms and Catalysis. 117:565-581 |
| ISSN: | 1878-5204 1878-5190 |
| DOI: | 10.1007/s11144-015-0969-2 |
| Popis: | γ-Al2O3 was doped with TEOS solution to obtain SiO2 content in the range of 0.6–12.4 wt%. Pt dispersion was effectively enhanced by 82 and 45 % by doping 0.6 and 1.2 wt% SiO2, and was slightly declined afterward. However, oxygen mobility as described by the reduction of basicity was monotonically decreased with increasing SiO2 content. The results from CO oxidation tests reveal a linear relationship between TOFs and desorbed-CO2. It is suggested that oxygen mobility plays a distinct role in controlling the surface reaction between CO and O surface species, which were activated by different adjacent Pt clusters. The highly dispersed Pt catalysts obtained by this technique can also be applied to other structure-insensitive reactions such as propane dehydrogenation. |
| Databáze: | OpenAIRE |
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