title: Ethyl Acetate Abatement on Copper Catalysts Supported on Ceria Doped with Rare Earth Oxides.
abstract: Different lanthanide (Ln)-doped cerium oxides (Ce0.5Ln0.5O1.75, where Ln: Gd, La, Pr, Nd, Sm) were loaded with Cu (20 wt. %) and used as catalysts for the oxidation of ethyl acetate (EtOAc), a common volatile organic compound (VOC). For comparison, both Cu-free (Ce-Ln) and supported Cu (Cu/Ce-Ln) samples were characterized by N₂ adsorption at -196 °C, scanning/transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy and temperature programmed reduction in H₂. The following activity sequence, in terms of EtOAc conversion, was found for bare supports: CeO₂ ≈ Ce0.5Pr0.5O1.75 > Ce0.5Sm0.5O1.75 > Ce0.5Gd0.5O1.75 > Ce0.5Nd0.5O1.75 > Ce0.5La0.5O1.75. Cu addition improved the catalytic performance, without affecting the activity order. The best catalytic performance was obtained for Cu/CeO₂ and Cu/Ce0.5Pr0.5O1.75 samples, both achieving complete EtOAc conversion below ca. 290 °C. A strong correlation was revealed between the catalytic performance and the redox properties of the samples, in terms of reducibility and lattice oxygen availability. Νo particular correlation between the VOC oxidation performance and textural characteristics was found. The obtained results can be explained in terms of a Mars-van Krevelen type redox mechanism involving the participation of weakly bound (easily reduced) lattice oxygen and its consequent replenishment by gas phase oxygen.
authors.affiliation: Laboratório de Catálise e Materiais (LCM), Laboratório Associado LSRE-LCM, Faculdade de Engenharia, Universidade do Porto, 4200-465 Porto, Portugal. sonia.carabineiro@fe.up.pt.
authors.forename: Sónia Alexandra Correia
authors.initials: SA
authors.lastname: Carabineiro
authors.affiliation: School of Production Engineering and Management, Technical University of Crete, 73100 Chania, Greece. mkonsol@science.tuc.gr.
authors.forename: Michalis
authors.initials: M
authors.lastname: Konsolakis
authors.affiliation: Department of Mechanical Engineering, University of Western Macedonia, GR-50100 Kozani, Greece. gmarnellos@uowm.gr.|Chemical Process &amp; Energy Resources Institute, Centre for Research &amp; Technology Hellas, GR-57001 Thessaloniki, Greece. gmarnellos@uowm.gr.
authors.forename: George Emmanouil-Nontas
authors.initials: GE
authors.lastname: Marnellos
authors.affiliation: Laboratório de Catálise e Materiais (LCM), Laboratório Associado LSRE-LCM, Faculdade de Engenharia, Universidade do Porto, 4200-465 Porto, Portugal. faizan_asad@hotmail.com.
authors.forename: Muhammad Faizan
authors.initials: MF
authors.lastname: Asad
authors.affiliation: Laboratório de Catálise e Materiais (LCM), Laboratório Associado LSRE-LCM, Faculdade de Engenharia, Universidade do Porto, 4200-465 Porto, Portugal. salome.soares@fe.up.pt.
authors.forename: Olívia Salomé Gonçalves Pinto
authors.initials: OS
authors.lastname: Soares
authors.affiliation: CQVR-Centro de Química-Vila Real, Departamento de Química, Universidade de Trás-os-Montes e Alto Douro, 5001-911 Vila Real, Portugal. ptavares@utad.pt.
authors.forename: Pedro Bandeira
authors.initials: PB
authors.lastname: Tavares
authors.affiliation: Laboratório de Catálise e Materiais (LCM), Laboratório Associado LSRE-LCM, Faculdade de Engenharia, Universidade do Porto, 4200-465 Porto, Portugal. fpereira@fe.up.pt.
authors.forename: Manuel Fernando Ribeiro
authors.initials: MF
authors.lastname: Pereira
authors.affiliation: Laboratório de Catálise e Materiais (LCM), Laboratório Associado LSRE-LCM, Faculdade de Engenharia, Universidade do Porto, 4200-465 Porto, Portugal. jjmo@fe.up.pt.
authors.forename: José Joaquim de Melo
authors.initials: JJ
authors.lastname: Órfão
authors.affiliation: Laboratório de Catálise e Materiais (LCM), Laboratório Associado LSRE-LCM, Faculdade de Engenharia, Universidade do Porto, 4200-465 Porto, Portugal. jlfig@fe.up.pt.
authors.forename: José Luís
authors.initials: JL
authors.lastname: Figueiredo
mesh_terms: D000085:Acetates / Q000737:chemistry*; D000327:Adsorption; D002384:Catalysis; D002563:Cerium / Q000737:chemistry*; D003300:Copper / Q000737:chemistry; D008674:Metals, Rare Earth / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry; D055549:Volatile Organic Compounds / Q000737:chemistry*
chemical_list: D000085:Acetates; D008674:Metals, Rare Earth; D055549:Volatile Organic Compounds; D002563:Cerium; C030583:ceric oxide; C007650:ethyl acetate; D003300:Copper; D010100:Oxygen
keywords: copper (Cu)-based catalysts; ethyl acetate oxidation; mixed oxides; rare earth oxides; volatile organic compounds (VOCs)