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Structure and morphological properties of Ca-containing La-Pb-Mn-O perovskites for catalytic applications

N. REZLESCU1, C. DOROFTEI1,2,* , E. REZLESCU1, P.D. POPA1, L. SACHELARIE3

Affiliation

  1. Institute of Technical Physics, Bd. D. Mangeron 47, 700050 Iasi, Romania
  2. “Al. I. Cuza” University, Faculty of Physics, 11 Carol I Blvd, 7000506 Iasi, Romania
  3. “Apolonia” University, Pacurari 11, Iaşi, Romania

Abstract

This paper is focused on less-studied system La-Pb-Ca-Mn-O perovskite like manganites. Calcium was introduced as partial substitution for Pb or as addition to the basic composition La0.6Pb0.4MnO3 (LPMO). La0.6Pb0.4MnO3, La0.6Pb0.2Ca0.2MnO3 and La0.6Pb0.4Ca0.2MnO3 perovskite manganite powders have been prepared by self-combustion method and heat treatment at 1000o C. The composites were characterized by X-ray diffraction, scanning electron microscopy and nitrogen adsorption/desorption isotherms. Scanning electron microscopy (SEM) pictures showed significant difference in the microstructure of LPMO after CaO incorporation. CaO added LPMO was found to have an average grain size (bellow 100 nm) much smaller than that of pure LPMO (~ 400 nm) due to Ca segregation on the grain surface. The catalytic tests showed that the combustion of acetone/air, ethanol/air and methanol/air over perovskite manganite catalysts can start at lower temperature (of about 300o C) than in the normal combustion due to nanometric crystallite size, large surface area and high concentration of Mn4+ cations..

Keywords

Perovskites; Structural properties; Catalytic activity.

Submitted at: Sept. 25, 2012
Accepted at: Feb. 20, 2013

Citation

N. REZLESCU, C. DOROFTEI, E. REZLESCU, P.D. POPA, L. SACHELARIE, Structure and morphological properties of Ca-containing La-Pb-Mn-O perovskites for catalytic applications, Journal of Optoelectronics and Advanced Materials Vol. 15, Iss. 1-2, pp. 62-65 (2013)