Efficient CO (carbon monoxide) oxidation using gold catalysts supported on WO3/titanate protonated nanotubes
| Autor: | N. Nava, Mariana Hinojosa-Reyes, R. Camposeco, Rodolfo Zanella, Salvador Castillo |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Mechanical Engineering Inorganic chemistry chemistry.chemical_element 02 engineering and technology Tungsten 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Redox Titanate 0104 chemical sciences Catalysis Metal Adsorption X-ray photoelectron spectroscopy chemistry Mechanics of Materials Colloidal gold visual_art visual_art.visual_art_medium General Materials Science 0210 nano-technology |
| Zdroj: | Materials Research Bulletin. 115:247-256 |
| ISSN: | 0025-5408 |
| DOI: | 10.1016/j.materresbull.2019.04.004 |
| Popis: | WO3/titanate protonated nanotubes used to disperse gold nanoparticles were prepared by the deposition-precipitation with urea method and tested in CO oxidation reaction. Remarkably enhanced CO oxidation activity was achieved with the addition of gold nanoparticles with respect to WO3/NT and Au/NT catalysts. XPS and H2/TPR showed that when the samples were activated at 400 °C under hydrogen treatment, gold was present in the metallic Au0 form and tungsten as W5+ and W6+ species; likewise, the addition of tungsten to the tubular morphology led to the formation of vacancies and new adsorption sites, preserving the structure at up to 400 °C. The interaction between WO3 and the titanate nanotubes was improved by adding gold nanoparticles with sizes around 1 and 3 nm under hydrogen treatment, increasing the content of reduced W5+ species that promoted the CO oxidation at low temperatures. The 2Au-3WO3/NT catalyst was active from 0 °C and showed temporary stability at room temperature. |
| Databáze: | OpenAIRE |
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