Due to the multiplicity of problems recently evidenced by the widely used N2O decomposition technique, the oxygen chemisorption technique for the measurement of Cu surface area was updated and optimized. A standard procedure was defined, which allows to obtain reliable and reproducible data. In particular, no arbitrary assumption was made for the Cu/O chemisorption stoichiometry and for the degree of surface coverage. Conversely an experimental value of the average Cu/O surface ratio, including the degree of coverage, was determined by XRD-WAXS data. The value obtained (2.35) corresponds to a chemisorption stoichiometry Cu/O = 2 and to about 15% unoccupied surface Cu atoms. The proposed technique has been successfully used for the characterization of several commercial low-temperature water gas shift catalysts (Cu-ZnO-Al2O3). © 2002 Elsevier Science B.V. All rights reserved.
|Data di pubblicazione:||2003|
|Titolo:||On the measurement of copper surface area by oxygen chemisorption|
|Rivista:||APPLIED CATALYSIS A: GENERAL|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/S0926-860X(02)00425-8|
|Appare nelle tipologie:||2.1 Articolo su rivista |
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