Study of Ce-Cu mixed oxide catalysts by in situ electrical conductivity measurements

Ionel Popescu; Marco Piumetti; Samir Bensaid; Ioan-Cezar Marcu

doi:10.1039/c7cp04517d

Study of Ce-Cu mixed oxide catalysts by in situ electrical conductivity measurements

Phys Chem Chem Phys. 2017 Dec 6;19(47):31929-31939. doi: 10.1039/c7cp04517d.

Authors

Ionel Popescu¹, Marco Piumetti, Samir Bensaid, Ioan-Cezar Marcu

Affiliation

¹ Research Center for Catalysts and Catalytic Processes, Faculty of Chemistry, University of Bucharest, 4-12, Blv. Regina Elisabeta, 030018 Bucharest, Romania.

PMID: 29177279
DOI: 10.1039/c7cp04517d

Abstract

Three Ce-Cu mixed oxides, namely Ce_0.95Cu_0.05, Ce_0.6Cu_0.4 and Ce_0.15Cu_0.85, along with pure CeO₂ and CuO were characterized by in situ electrical conductivity measurements. Their electrical conductivity was studied as a function of temperature and oxygen partial pressure, and was followed with time during successive exposure to air, nitrogen and different gaseous mixtures containing propane as a VOC model molecule, under conditions close to those of their catalytic applications. CeO₂ and CuO appeared to be n-type and p-type semiconductors, respectively, while the semiconducting behavior of the Ce-Cu mixed oxides depended on the oxide composition. The semiconductive and redox properties of the samples were correlated with their catalytic behavior in CO oxidation, ethene total oxidation and soot combustion.