Site energy distribution of copper catalytic surfaces from volumetric datacollected at various temperatures

Citation
A. Gervasini et al., Site energy distribution of copper catalytic surfaces from volumetric datacollected at various temperatures, THERMOC ACT, 379(1-2), 2001, pp. 95-99
Citations number
19
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences
Journal title
THERMOCHIMICA ACTA
ISSN journal
0040-6031 → ACNP
Volume
379
Issue
1-2
Year of publication
2001
Pages
95 - 99
Database
ISI
SICI code
0040-6031(20011122)379:1-2<95:SEDOCC>2.0.ZU;2-M
Abstract
Two catalysts prepared on a titanium silicate (ETS-10) matrix by loading 6 and 11 wt.% of copper were studied by employing nitrogen monoxide as adsorb ate to probe the surface properties of copper centres. Volumetric isotherms of NO adsorption were collected at different temperatures (19-70 degreesC) . A thermodynamic model was applied to the isotherms in order to describe t he behaviour of the NO-Cu system in ten-ns of surface energy distribution o f Cu sites. The higher loading copper sample had more energetic interaction with NO (-171 < Delta H-a (kJ/moI) < -44), with higher heterogeneity, than the less loaded one (-111 < Delta H-a (kJ/mol) < -41). The properties of t he Cu sites were related with the activity measured in the SCR of NO with e thylene. (C) 2001 Elsevier Science B.V. All rights reserved.