Atomic Scale Imaging of Oscillation and Chemical Waves at Catalytic Surface Reactions: Experimental and Statistical Lattice Models Научная публикация
Сборник | Finely Dispersed Particles : Micro-, Nano-, and Atto-Engineering Монография, CRC Press. 2005. ISBN 9781574444636. Scopus |
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Вых. Данные | Год: 2005, Страницы: 159-190 Страниц : 32 DOI: 10.1201/9781420027662.ch7 | ||
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Реферат:
The catalytic oxidation of CO over platinum group metals is relatively simple and also important from the ecological viewpoint. In addition, this reaction exhibits a rich kinetic behavior, including regimes with sustained kinetic oscillations (for reviews, see [1-12]). Great interest in self-oscillatory phenomena in catalytic reaction over metal surfaces is for a large part caused by the possibility to perform more effectively the catalytic processes using the unsteady-state operation. The CO and H2 oxidation on metals (Pt, Pd) is a nonlinear system, in which temporal and spatial organization becomes possible [1,2]. In the oscillatory regime, the reaction mixture periodically affects the properties of metal surfaces. As there is a synergy between the concentrations of the adsorbed species and the structure of the surface throughout those oscillations, and as the different products often display different oscillation cycles, and are also objected by changes in surface phases, valuable information can be extracted about the mechanism of such reactions from kinetic and characterization studies on the surface species. In the last decades, CO oxidation reaction has became a model for testing the newest physical methods for studying the structure and composition of catalysts. Specifically, it has been reported that the mechanisms of oscillatory oxidation reactions are connected with a periodic change of surface structure (from a reconstructed hexagonal phase to the unreconstructed surface in surface structure on Pt(1 0 0)), with subsurface oxygen formation (at least on Pd(1 1 0)), and with the “explosive” nature of interactions between adsorbed species [1-3]. A common feature in all these mechanisms is the spontaneous periodical transitions of the metal from inactive to highly active states. Since the first discovery of a relationship between reconstruction and kinetic oscillations in CO oxidation on Pt(1 0 0) by Ertl [1], this has become one of the most extensively investigated oscillatory systems in heterogeneous catalysis. The use of spatially resolved
(1 mm) photoelectron emission microscopy made it then possible to discover the formation of chemical waves on the surfaces of Pt and Pd single crystals [1]. Real metal and support catalysts usually consist of nanosized metal particles on which different crystal planes are exposed. The important question is, can a small supported particle be compared with macroscopic single-crystal surfaces that are normally used in surface science studies. Recent experimental work has shown that field electron microscopy (FEM), which has a sharp tip with a lateral resolution of 20 Å, can also serve as an in situ catalytic flow reactor for the study of these oscillations [3,13].
Библиографическая ссылка:
Gorodetskii V.V.
, Elokhin V.I.
Atomic Scale Imaging of Oscillation and Chemical Waves at Catalytic Surface Reactions: Experimental and Statistical Lattice Models
Глава монографии Finely Dispersed Particles : Micro-, Nano-, and Atto-Engineering. – CRC Press., 2005. – Т.130. – C.159-190. – ISBN 9781574444636. DOI: 10.1201/9781420027662.ch7 Scopus РИНЦ
Atomic Scale Imaging of Oscillation and Chemical Waves at Catalytic Surface Reactions: Experimental and Statistical Lattice Models
Глава монографии Finely Dispersed Particles : Micro-, Nano-, and Atto-Engineering. – CRC Press., 2005. – Т.130. – C.159-190. – ISBN 9781574444636. DOI: 10.1201/9781420027662.ch7 Scopus РИНЦ
Даты:
Опубликована в печати: | 14 окт. 2005 г. |
Опубликована online: | 12 мар. 2010 г. |
Идентификаторы БД:
Scopus | 2-s2.0-85047013932 |
РИНЦ | 38613956 |
OpenAlex | W4235301188 |