Реферат: The reaction of hydrogen with a series of polyvalent metal oxides (Fe2O3, WO3, MoO3, V2O5, Sb2O3, PbO2, Cr2O3, NiO, CuO, Co3O4, MnO2, PdO, Ag2O) was investigated at low temperatures (77–320 K) and pressures (0.001–0.7 kPa). Pd-doped (0.1–0.5 wt.%) transition metal oxides can be reduced by hydrogen at 77–320 K whereas the onset of the reduction of the pure oxides occurs at temperatures higher than 500–700 K. It is shown that oxides, possessing a low stability of the metal–oxygen bond, a significant oxygen-diffusion coefficient from the oxide volume, and a large specific surface area are promising low-temperature vacuum hydrogen getters. Two temperature regions with different kinetics have been found for the most active oxides (Co3O4, CuO, MnO2): 77–210 and 220–320 K. At 77–180 K, the chemical interaction between hydrogen and the Pd-doped oxides proceeds with an apparent zero activation energy according to the equation P = ln τ. At 195–320 K, a first-order reaction is found. XPS studies of the low-temperature reduction catalysts show Pd on oxides. A possible reaction mechanism is discussed. It is supposed that proton spillover into the lattice is critical for the low-temperature oxide reduction. A electron tunnel mechanism is probable too.

Библиографическая ссылка: Belousov V.M. , Vasylyev M.A. , Lyashenko L.V. , Vilkova N.Y. , Nieuwenhuys B.E.
The Low-Temperature Reduction of Pd-doped Transition Metal Oxides Surface with Hydrogen
Chemical Engineering Journal. 2003. V.91. N2-3. P.143-150. DOI: 10.1016/s1385-8947(02)00147-x WOS Scopus OpenAlex

Идентификаторы БД:

Web of science:	WOS:000181148600007
Scopus:	2-s2.0-0037445408
OpenAlex:	W1986262452

Цитирование в БД:

БД	Цитирований
OpenAlex	39
Scopus	53

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