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
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.