title: Influence of transition metal electronegativity on the oxygen storage capacity of perovskite oxides.
abstract: The selection of highly efficient oxygen carriers (OCs) is a key step necessary for the practical development of chemical looping combustion (CLC). In this study, a series of ABO3 perovskites, where A = La, Ba, Sr, Ca and B = Cr, Mn, Fe, Co, Ni, Cu, are synthesized and tested in a fixed bed reactor for reactivity and stability as OCs with CH4 as the fuel. We find that the electronegativity of the transition metal on the B-site (λB), is a convenient descriptor for oxygen storage capacity (OSC) of our perovskite samples. By plotting OSC for total methane oxidation against λB, we observe an inverted volcano plot relationship. These results could provide useful guidelines for perovskite OC design and their other energy related applications.
authors.affiliation: Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, USA. mrz@umd.edu.
authors.forename: Lu
authors.initials: L
authors.lastname: Liu
authors.affiliation: Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA.
authors.forename: Daniel D
authors.initials: DD
authors.lastname: Taylor
authors.affiliation: Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, USA. mrz@umd.edu.
authors.forename: Efrain E
authors.initials: EE
authors.lastname: Rodriguez
authors.affiliation: Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, USA. mrz@umd.edu and Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA.
authors.forename: Michael R
authors.initials: MR
authors.lastname: Zachariah