fulltext.study @t Gmail

Effect of calcination temperature on the structural characteristics and catalytic activity for propene combustion of sol–gel derived lanthanum chromite perovskite

Paper ID Volume ID Publish Year Pages File Format Full-Text
44145 46005 2007 7 PDF Available
Title
Effect of calcination temperature on the structural characteristics and catalytic activity for propene combustion of sol–gel derived lanthanum chromite perovskite
Abstract

The perovskite type lanthanum chromite LaCrO3 has been synthesized by a sol–gel method. Its bulk structural and surface characteristics have been examined by X-ray diffraction (XRD), SEM, SBET measurements, Fourier Transform Infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) as a function of the calcination treatment performed between 200 and 1000 °C over the precursor powder and in correlation with information achieved from TG-DTA thermal analysis. The characterization results are employed to rationalize the catalytic behaviour of the system towards propene complete oxidation. It is shown that the catalytic activity becomes optimized when a single perovskite LaCrO3 phase is achieved upon calcination at T > ca. 700 °C. In contrast, coexistence of perovskite LaCrO3 and monazite LaCrO4 at lower calcination temperatures appears detrimental to the combustion activity of the system.

Graphical abstractA study of a sol–gel prepared lanthanum chromite perovskite catalyst following in detail the structural evolution as a function of the calcination steps between 200 and 1000 °C in correlation with the catalytic activity for propene combustion of the system at selected temperatures in such range is presented. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
LaCrO3–LaCrO4; Perovskite; Sol–gel; Calcination temperature; C3H6 combustion; SOFC
First Page Preview
Effect of calcination temperature on the structural characteristics and catalytic activity for propene combustion of sol–gel derived lanthanum chromite perovskite
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 327, Issue 2, 15 August 2007, Pages 173–179
Authors
, , , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis