Effect of the Microstructure of the Semiconductor Support on the Photocatalytic Performance of the Pt-PtOx/TiO2 Catalyst System
Autor: | Emília Tálas, Katalin Majrik, Francesco Frusteri, András Tompos, Zoltán Pászti, László Korecz, Catia Cannilla, Péter Németh, Giuseppe Bonura, Judith Mihály, Zoltán May |
---|---|
Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
Materials science
02 engineering and technology 010402 general chemistry 01 natural sciences calcination lcsh:Technology Article high-temperature H2 treatment law.invention symbols.namesake X-ray photoelectron spectroscopy law Specific surface area XPS General Materials Science Calcination lcsh:Microscopy Sol-gel ESR lcsh:QC120-168.85 sol–gel method lcsh:QH201-278.5 lcsh:T 021001 nanoscience & nanotechnology Microstructure 0104 chemical sciences Chemical engineering lcsh:TA1-2040 Photocatalysis symbols TEM lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering 0210 nano-technology Raman spectroscopy lcsh:Engineering (General). Civil engineering (General) lcsh:TK1-9971 Powder diffraction |
Zdroj: | Materials, Vol 14, Iss 943, p 943 (2021) Materials Volume 14 Issue 4 |
ISSN: | 1996-1944 |
Popis: | The influence of the semiconductor microstructure on the photocatalytic behavior of Pt-PtOx/TiO2 catalysts was studied by comparing the methanol-reforming performance of systems based on commercial P25 or TiO2 from sol–gel synthesis calcined at different temperatures. The Pt co-catalyst was deposited by incipient wetness and formed either by calcination or high-temperature H2 treatment. Structural features of the photocatalysts were established by X-ray powder diffraction (XRD), electron spin resonance (ESR), X-ray photoelectron spectroscopy (XPS), optical absorption, Raman spectroscopy and TEM measurements. In situ reduction of Pt during the photocatalytic reaction was generally observed. The P25-based samples showed the best H2 production, while the activity of all sol–gel-based samples was similar in spite of the varying microstructures resulting from the different preparation conditions. Accordingly, the sol–gel-based TiO2 has a fundamental structural feature interfering with its photocatalytic performance, which could not be improved by annealing in the 400–500 °C range even by scarifying specific surface area at higher temperatures. |
Databáze: | OpenAIRE |
Externí odkaz: |