Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Low-temperature catalytic CO oxidation over mixed silver-copper oxide Ag2Cu2O3. / Svintsitskiy, D. A.; Slavinskaya, E. M.; Kardash, T. Yu и др.
в: Applied Catalysis A: General, Том 510, 25.01.2016, стр. 64-73.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
}
TY - JOUR
T1 - Low-temperature catalytic CO oxidation over mixed silver-copper oxide Ag2Cu2O3
AU - Svintsitskiy, D. A.
AU - Slavinskaya, E. M.
AU - Kardash, T. Yu
AU - Avdeev, V. I.
AU - Senkovskiy, B. V.
AU - Koscheev, S. V.
AU - Boronin, A. I.
PY - 2016/1/25
Y1 - 2016/1/25
N2 - Mixed silver-copper oxide Ag2Cu2O3 was investigated by a combination of physicochemical techniques, including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and temperature programmed reaction (TPR). The catalytic properties of Ag2Cu2O3 in the reaction of CO oxidation were studied by the TPR-CO + O2 method and compared with those of CuO nanopowder characterized by a similar specific surface area. On the surface of Ag2Cu2O3, two unequivalent oxygen species (Eb(O1s) = 529.4 eV and 531 eV) with different reaction probability towards CO were observed. Previously, similar oxygen species had been found on the surface of CuO nanopowder. Mixed silver-copper oxide interacted with CO at room temperature, which resulted in the surface reduction Cu2+ → Cu1+. Such reduction was accompanied by the removal of only oxygen with Eb(O1s) ∼ 531 eV. When the mixed oxide was heated in the reaction medium, both oxygen species were eliminated from the surface, leading to the partial decomposition of the Ag2Cu2O3 structure and the appearance of metallic silver. The TPR-CO study showed the presence of weakly bound oxygen species which can be adsorbed on oxygen vacancies in the Ag2Cu2O3 paramelaconite structure. The energy of oxygen vacancy formation on the (001) and (101) surfaces of Ag2Cu2O3 were calculated by periodic density functional theory (DFT). The role of different oxygen species in CO oxidation over the Ag2Cu2O3 surface is discussed.
AB - Mixed silver-copper oxide Ag2Cu2O3 was investigated by a combination of physicochemical techniques, including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and temperature programmed reaction (TPR). The catalytic properties of Ag2Cu2O3 in the reaction of CO oxidation were studied by the TPR-CO + O2 method and compared with those of CuO nanopowder characterized by a similar specific surface area. On the surface of Ag2Cu2O3, two unequivalent oxygen species (Eb(O1s) = 529.4 eV and 531 eV) with different reaction probability towards CO were observed. Previously, similar oxygen species had been found on the surface of CuO nanopowder. Mixed silver-copper oxide interacted with CO at room temperature, which resulted in the surface reduction Cu2+ → Cu1+. Such reduction was accompanied by the removal of only oxygen with Eb(O1s) ∼ 531 eV. When the mixed oxide was heated in the reaction medium, both oxygen species were eliminated from the surface, leading to the partial decomposition of the Ag2Cu2O3 structure and the appearance of metallic silver. The TPR-CO study showed the presence of weakly bound oxygen species which can be adsorbed on oxygen vacancies in the Ag2Cu2O3 paramelaconite structure. The energy of oxygen vacancy formation on the (001) and (101) surfaces of Ag2Cu2O3 were calculated by periodic density functional theory (DFT). The role of different oxygen species in CO oxidation over the Ag2Cu2O3 surface is discussed.
KW - AgCuO
KW - CO oxidation
KW - Mixed silver-copper oxide
KW - Oxygen species
KW - Paramelaconite
KW - XPS
UR - http://www.scopus.com/inward/record.url?scp=84947771210&partnerID=8YFLogxK
U2 - 10.1016/j.apcata.2015.11.011
DO - 10.1016/j.apcata.2015.11.011
M3 - Article
AN - SCOPUS:84947771210
VL - 510
SP - 64
EP - 73
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
SN - 0926-860X
ER -
ID: 25417182