In Situ Preparation of Highly Stable Ni-Based Supported Catalysts by Solution Combustion Synthesis
| Autor: | Sergey Roslyakov, Dmitry Yu. Kovalev, Alexander S. Mukasyan, Eduardo E. Wolf, Sergei Rouvimov, Khachatur V. Manukyan, Alexander S. Rogachev, Allison Cross |
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| Rok vydání: | 2014 |
| Předmět: |
Argon
Materials science Inorganic chemistry chemistry.chemical_element Nanoparticle 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Combustion 7. Clean energy 01 natural sciences Oxygen 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Catalysis Nickel General Energy chemistry Physical and Theoretical Chemistry 0210 nano-technology Inert gas Fumed silica |
| Zdroj: | The Journal of Physical Chemistry C. 118:26191-26198 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | Solution combustion synthesis (SCS) is typically used to produce nanostructured oxides and bulk metallic materials for a variety of application including catalysis. Here, we report in situ, one-step SCS of high surface area (155 m2/g) Ni catalysts supported on fumed silica (SiO2). Time-resolved X-ray diffraction is used to investigate the dynamics of phase formation during combustion of nickel nitrate–glycine–ammonium nitrate reactive gels impregnated onto porous SiO2. It is shown that highly dispersed nickel nanoparticles (5 nm) formed in the reaction front are followed by their rapid oxidation by air oxygen. To prevent the undesired oxidation process, the synthesis was conducted in an inert atmosphere (argon, helium). It is demonstrated that low concentration oxygen impurity (less than 0.001 wt %) in the inert gas passivates the Ni nanoparticles through the formation of a thin amorphous oxide layer. The thus prepared Ni/SiO2 supported catalyst possesses high activity during the ethanol decomposition tow... |
| Databáze: | OpenAIRE |
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