Zirconia Modification on Nanocrystalline Titania-Supported Cobalt Catalysts for Methanation
| Autor: | Artiwan Shotipruk, Kitima Pinkaew, Piyasan Praserthdam, James G. Goodwin, Bunjerd Jongsomjit, Joongjai Panpranot, Okorn Mekasuwandumrong |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
Nanocrystalline TiO2 Inorganic chemistry General Engineering chemistry.chemical_element Nanocrystalline material Catalysis chemistry.chemical_compound chemistry lcsh:TA1-2040 Methanation Chemisorption Alkoxide cobalt catalyst sol-gel methanation Cubic zirconia Crystallite CO hydrogenation lcsh:Engineering (General). Civil engineering (General) Cobalt |
| Zdroj: | Engineering Journal, Vol 16, Iss 4 (2012) |
| ISSN: | 0125-8281 |
| Popis: | In this present study, the zirconia-modified different crystallite sizes of TiO 2 (11, 13 and 16 nm) as support for the cobalt catalysts were investigated. The different TiO 2 crystallites derived from the sol-gel method was obtained by varying the water:alkoxide molar ratio from 165 to 4 to gain the different nanocrystallite sizes of TiO 2 . Then, the TiO 2 supports were used to yield various Co/TiO 2 catalysts. It was found that the sizes of cobalt oxides species dispersed on TiO 2 were corresponding to TiO 2 sizes. Based on XPS study, the binding energy of Co 2p3/2 was not affected by the size of TiO 2 . The catalytic activity was measured via CO hydrogenation under methanation condition. In case of unmodified TiO 2 support, the smaller TiO 2 crystallites (Co/TiO 2 _11 nm) exhibited higher activity than other larger ones. Moreover, the zirconia modification also resulted in increased in activity for all samples. For both cases, it can be attributed to increased cobalt dispersion with small crystallite size of TiO 2 support coupled with the zirconia modification as measured by CO chemisorption. |
| Databáze: | OpenAIRE |
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