Stages in the Modification of a Silver Surface for Catalysis of the Partial Oxidation of Ethylene: I. Action of Oxygen
Publication type: Journal Article
Publication date: 1994-12-01
scimago Q1
wos Q1
SJR: 1.558
CiteScore: 10.9
Impact factor: 6.5
ISSN: 00219517, 10902694
Catalysis
Physical and Theoretical Chemistry
Abstract
The interaction of silver foil with oxygen over a wide range of temperatures and O2 pressures has been studied by XPS, TPD, and TPR. It has been shown that depending on the treatment conditions two adsorbed oxygen states with a different ionicity of the AgO bond can be formed, as well as oxygen dissolved in the silver bulk. "Ionic" oxygen [Eb(O 1s) = 528.4 eV] is formed in the initial step of O2 adsorption, its incorporation into uppermost silver layer proceeding at T > 420 K. This state is responsible for ethylene adsorption, followed by its destruction and complete oxidation to CO2 and H2O. Dissolution of oxygen atoms in the silver bulk starts at T > 470 K. No effect of the dissolved oxygen on the electronic and catalytic properties of the "ionic" oxygen has been revealed. Accumulation of "covalent" oxygen [Eb (O 1s = 530.5 eV] occurs at higher temperature and pressure. A possible mechanism for its formation which includes the creation of specific defective sites on silver surface is discussed. Despite a large variation of pressures and temperatures used for the modification of clean silver foil by O2, all attempts to produce a surface active in ethylene epoxidation have failed.
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Bukhtiyarov V., Boronin A., Savchenko V. Stages in the Modification of a Silver Surface for Catalysis of the Partial Oxidation of Ethylene: I. Action of Oxygen // Journal of Catalysis. 1994. Vol. 150. No. 2. pp. 262-267.
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Bukhtiyarov V., Boronin A., Savchenko V. Stages in the Modification of a Silver Surface for Catalysis of the Partial Oxidation of Ethylene: I. Action of Oxygen // Journal of Catalysis. 1994. Vol. 150. No. 2. pp. 262-267.
Cite this
RIS
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TY - JOUR
DO - 10.1006/jcat.1994.1344
UR - https://doi.org/10.1006/jcat.1994.1344
TI - Stages in the Modification of a Silver Surface for Catalysis of the Partial Oxidation of Ethylene: I. Action of Oxygen
T2 - Journal of Catalysis
AU - Bukhtiyarov, Valerii
AU - Boronin, Andrei
AU - Savchenko, V.I
PY - 1994
DA - 1994/12/01
PB - Elsevier
SP - 262-267
IS - 2
VL - 150
SN - 0021-9517
SN - 1090-2694
ER -
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BibTex (up to 50 authors)
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@article{1994_Bukhtiyarov,
author = {Valerii Bukhtiyarov and Andrei Boronin and V.I Savchenko},
title = {Stages in the Modification of a Silver Surface for Catalysis of the Partial Oxidation of Ethylene: I. Action of Oxygen},
journal = {Journal of Catalysis},
year = {1994},
volume = {150},
publisher = {Elsevier},
month = {dec},
url = {https://doi.org/10.1006/jcat.1994.1344},
number = {2},
pages = {262--267},
doi = {10.1006/jcat.1994.1344}
}
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MLA
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Bukhtiyarov, Valerii, et al. “Stages in the Modification of a Silver Surface for Catalysis of the Partial Oxidation of Ethylene: I. Action of Oxygen.” Journal of Catalysis, vol. 150, no. 2, Dec. 1994, pp. 262-267. https://doi.org/10.1006/jcat.1994.1344.
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