The morphologic (N2 adsorption and SEM), structural (XRD and FT-IR), redox (TPR/TPO cycles), acidic (TPD of 2-phenylethylamine), and surface (XPS) properties of supported CuO phases on niobic acid (Nb2O5‚nH2O, labeled as NBO) and niobium phosphate (NbOPO4, labeled as NBP) materials were presented together with their catalytic properties toward the decomposition and reduction of the N2O and NO species. An equilibrium adsorption method from copper acetate precursor was used to deposit the copper phase over the two niobium supports (about 8 wt % loading). The prevalent covalent, for NBO, or ionic, for NBP, character of the support materials strongly affected the electronic properties of the supported CuO phase, which was in nanosized aggregates in any case. The acidity of the Cu surfaces was high because of the presence of acid sites of the support (prevalent Bro¨nsted acid sites) and those associated with dispersed metal species (Lewis acid sites). The CuO phase was better anchored on NBP than on NBO, as shown by the very limited migration of the CuO species on NBP following reducing and oxidizing thermal treatments. The CuO surfaces showed different catalytic performances toward the reactions of N2O decomposition in inert and oxidant atmospheres and N2O and NO reduction by ethene in a highly oxidant atmosphere. CuO over NBO was more active than that over NBP in any case, whereas the NBP support enhanced the reaction selectivity of the copper phase.
Influence of the chemical nature of the support (niobic acid and niobium phosphate) on the surface and catalytic properties of supported CuO / A. Gervasini, P. Carniti, S. Bennici, C. Messi. - In: CHEMISTRY OF MATERIALS. - ISSN 0897-4756. - 19:6(2007), pp. 1319-1328.
|Titolo:||Influence of the chemical nature of the support (niobic acid and niobium phosphate) on the surface and catalytic properties of supported CuO|
GERVASINI, ANTONELLA (Primo)
CARNITI, PAOLO (Secondo)
BENNICI, SIMONA MARIA (Penultimo)
MESSI, CLAUDIA (Ultimo)
|Settore Scientifico Disciplinare:||Settore CHIM/02 - Chimica Fisica|
|Data di pubblicazione:||2007|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1021/cm062503v|
|Appare nelle tipologie:||01 - Articolo su periodico|