Size effect in CO oxidation on CeO2 − x nanoparticles
| Autor: | A. S. Lermontov, O. S. Polezhaeva, M. S. Yakimova, Yu. D. Tret'yakov, Alexander E. Baranchikov, Vladimir Ivanov |
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| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Doklady Chemistry. 430:4-7 |
| ISSN: | 1608-3113 0012-5008 |
| Popis: | The change in physicochemical properties of sub� stances in transition to the nanocrystalline state has attracted considerable attention of researchers and engineers in the last decade. However, known exam� ples of change in catalytic properties in such a transi� tion are relatively few, and most of them involve an increase in the specific surface area and a correspond� ing increase in the number of active sites, whereas the issue of a possible change in the crystal structure of a catalyst with a decrease in the particle size remains vir� tually unstudied. Indeed, minor changes in the crystal lattice parameters of the active component of a cata� lyst are usually caused by introducing various modify� ing additives, which increase the number of defects [1]; meanwhile, a comparable result can also be achieved by transition to the nanocrystalline state, in which the crystal lattice parameters change because of a sharp increase in the contribution of the surface forces and the necessity of balancing them. Note that a decrease in the particle size of the active component may lead both to a desirable increase in the activity and to an abrupt decrease in it, which is also caused by structural changes [2]. |
| Databáze: | OpenAIRE |
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