Catalytic combustion of methane over LaFeO3 perovskites: the influence of coprecipitation pH and ageing time

EFFECT OF COOPER ON THE CATALYTIC ACTIVITY FOR ACETYLACETATE COMBUSTION OF Ca1-x Cu xZrO3 AND Sr1-xCu xZrO3 PEROVSKITE-TYPE OXIDES

“…It is noticeable the high catalytic activity (low T 50 ) of the pure CaZrO 3 and SrZrO 3 a stoichiometric perovskite, almost non reducible solid compared to pure. This non expected result is in line with the higher catalytic activity of a non-reducible perovskite as LaFeO 3 compared to LaCoO 3 and points out the specific properties of perovskite-type oxides to be used as catalysts for a given oxidation reaction [16,31,32]. …”

“…Thus the activity in oxidation and reduction reaction is mainly determined by the transition metal in the B-site. For lanthanum perovskites, the best catalytic performances in catalytic combustion are exhibited by Co, Fe or Mn as B cation [13][14][15] attributed to oxygen defects [15,16]. In general, the reported catalytic performance of perovskites for oxidation reactions are A 3+ B 3+ O 3 6-systems, even though recently Pecchi et al [17,18] reported the advantages of the intrinsic activity and resistance to deactivation of K 1+ Nb 5+ O 3 6-perovskites on the catalytic soot combustion.…”

SYNTHESIS OF Pb2Fe2O5 BY THERMAL DECOMPOSITION OF Pb2[Fe(CN)6].4H2O

“…The structure refinement of Pb 2 [Fe(CN) 6 ].4H 2 O was performed by Rietveld Method using the FULLPROF program with laboratory powder XRD data, in the space group P2 1 /m 15 . The size and morfology of the particles were determinated by scanning electron microscopy (SEM) with a JEOL JSM 35 CF.…”

“…However, its structure has not yet been determined because it has a large variety of crystallographic shear 14 . In this paper we propose the synthesis of Pb 2 Fe 2 O 5 obtained by a very simple method, the thermal oxidative decomposition of Pb 2 [Fe(CN) 6 ].4H 2 O at low temperature. The decomposition process was followed by IR spectroscopy, thermogravimetric analysis (TGA), differential thermal analysis (DTA), laboratory X -ray powder diffraction (XRPD) and scanning electron microscopy (SEM).…”

“…In the specific case of A=lanthanum, its oxides are particular suitable for applications as a material for sensors, for the detection of vapors and gases such as humidity, alcohol, oxygen, hydrocarbons, CO and NO 2 3-5 . Pecchi et al prepared LaFeO 3 with different procedures and they compared them as catalysts for methane oxidation 6 . On the other hand, Bouyssières et al replaced partially La in the lattice by Ca, Sr or Ba and they studied the variation of surface area and its possible catalytic activity for CO oxidation 7 .…”