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 adsorbate to probe the surface properties of copper centres. Volumetric isotherms of NO adsorption were collected at different temperatures (19-70°C). A thermodynamic model was applied to the isotherms in order to describe the behaviour of the NO-Cu system in terms of surface energy distribution of Cu sites. The higher loading copper sample had more energetic interaction with NO (-171 < ΔaH (kJ/mol) < -44), with higher heterogeneity, than the less loaded one (-111 < ΔaH (kJ/mol) < -41). The properties of the Cu sites were related with the activity measured in the SCR of NO with ethylene.
|Titolo:||Site energy distribution of copper catalytic surfaces from volumetric data collected at various temperatures|
GERVASINI, ANTONELLA (Primo)
CARNITI, PAOLO (Secondo)
|Settore Scientifico Disciplinare:||Settore CHIM/02 - Chimica Fisica|
|Data di pubblicazione:||2001|
|Digital Object Identifier (DOI):||10.1016/S0040-6031(01)00607-4|
|Appare nelle tipologie:||01 - Articolo su periodico|