EXAFS and optical spectroscopy characterisation of reduction products of binary silver-copper ion mixture in mordenite
EXAFS and optical spectroscopy characterisation of reduction products of binary silver-copper ion mixture in mordenite
Ag+, Cu2+ and Ag+-Cu2+ binary mixtures with different Ag/Cu ratios were supported on mordenite with Si/Al ratio equal to 10 and reduced in the temperature range 323-673 K. Diffuse Reflectance UV-Visible spectra reveal appearance of Ag-8 clusters and small copper metal particles. Cu K-edge EXAFS show for Cu-rich non-reduced samples the presence of only oxygen shell; but for the Ag-rich sample, the presence of heavier backscatterer is also indicated producing a different EXAFS envelope. Silver EXAFS analysis suggests that, for the reduced samples, there are both Ag - 0 and Ag - Ag distances (Ag - Ag and Ag - O coordination numbers of approx 2 and of 1.3 respectively for the Ag/Cu = 3:1. and 1:3 samples). Importantly. for the reduced sample, the EXAFS indicates that Ag appears to promote/stabilise Cu cluster formation whereas Cu appears to impede/destabilise Ag cluster formation.
sio2/al2o3 molar ratio, ag-cu, diesel-engines, clusters, nanoparticles, absorption, catalysts, zeolites, exhaust, no
253-256
Fiddy, S.G.
bccae976-2d50-4e80-a0da-705249bc7bc0
Ogden, J.S.
d022e70d-b424-4100-9517-64a46486dd8c
Petranovskii, V.P.
8541f502-19cb-4cbf-a8ab-bee6fe2df857
2003
Fiddy, S.G.
bccae976-2d50-4e80-a0da-705249bc7bc0
Ogden, J.S.
d022e70d-b424-4100-9517-64a46486dd8c
Petranovskii, V.P.
8541f502-19cb-4cbf-a8ab-bee6fe2df857
Fiddy, S.G., Ogden, J.S. and Petranovskii, V.P.
(2003)
EXAFS and optical spectroscopy characterisation of reduction products of binary silver-copper ion mixture in mordenite.
The European Physical Journal D, 24 (1-3), .
(doi:10.1140/epjd/e2003-00110-1).
Abstract
Ag+, Cu2+ and Ag+-Cu2+ binary mixtures with different Ag/Cu ratios were supported on mordenite with Si/Al ratio equal to 10 and reduced in the temperature range 323-673 K. Diffuse Reflectance UV-Visible spectra reveal appearance of Ag-8 clusters and small copper metal particles. Cu K-edge EXAFS show for Cu-rich non-reduced samples the presence of only oxygen shell; but for the Ag-rich sample, the presence of heavier backscatterer is also indicated producing a different EXAFS envelope. Silver EXAFS analysis suggests that, for the reduced samples, there are both Ag - 0 and Ag - Ag distances (Ag - Ag and Ag - O coordination numbers of approx 2 and of 1.3 respectively for the Ag/Cu = 3:1. and 1:3 samples). Importantly. for the reduced sample, the EXAFS indicates that Ag appears to promote/stabilise Cu cluster formation whereas Cu appears to impede/destabilise Ag cluster formation.
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Published date: 2003
Keywords:
sio2/al2o3 molar ratio, ag-cu, diesel-engines, clusters, nanoparticles, absorption, catalysts, zeolites, exhaust, no
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Local EPrints ID: 19951
URI: http://eprints.soton.ac.uk/id/eprint/19951
ISSN: 1434-6060
PURE UUID: 2757894c-7036-4a51-8df6-197b0eb29fd1
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Date deposited: 24 Feb 2006
Last modified: 15 Mar 2024 06:20
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Author:
S.G. Fiddy
Author:
J.S. Ogden
Author:
V.P. Petranovskii
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