NDLI: An XPS study of the oxidation of noble metal particles evaporated onto the surface of an oxide support in their reaction with NO$

Content Provider	Springer Nature Link
Author	Smirv, M. Yu. Vovk, E. I. Kalinkin, A. V. Pashis, A. V. Bukhtiyarov, V. I.
Copyright Year	2012
Abstract	The interaction of the model catalysts Rh/Al$_{2}$O$_{3}$, Pd/Al$_{2}$O$_{3}$, Pt/Al$_{2}$O$_{3}$, and Pt/SiO$_{2}$ with NO$_{ x }$ (mixture of 10 Torr of NO and 10 Torr of O$_{2}$) was studied by X-ray photoelectron spectroscopy (XPS). Samples of the model catalysts were prepared under vacuum conditions as oxide films ≥100 Å in thickness on tantalum foil with evaporated platinum-group metal particles. According to transmission electron microscopic data, the platinum-group metal particle size was several nanometers. It was found by XPS that the oxidation of Rh and Pd nanoparticles in their interaction with NO$_{ x }$ occurs already at room temperature. The particles of platinum were more stable: their oxidation under the action of NO$_{ x }$ was observed at elevated temperatures of ∼300°C. At room temperature, the interaction of platinum nanoparticles with NO$_{ x }$ hypothetically leads to the dissolution (insertion) of oxygen atoms in the bulk of the particles with the retention of their metallic nature. It was found that dissolved oxygen is much more readily reducible by hydrogen than the lattice oxygen of the platinum oxide particles.
Starting Page	117
Ending Page	124
Page Count	8
File Format	PDF
ISSN	00231584
Journal	Kinetics and Catalysis
Volume Number	53
Issue Number	1
e-ISSN	16083210
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2012-02-14
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Catalysis Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis Modeling and Simulation Computer Science Applications

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