Combined methane reforming in presence of CO2 and O2 over LaFe1−xCoxO3 mixed-oxide perovskites as catalysts precursors

Structured Perovskite-Based Oxides: Use in the Combined Methane Reforming

“…The IR spectra of the synthesized solids showed two broad bands characteristics of ABO 3 mixed-oxide centered at 420 and 523 cm -1 . Their positions are in good agreement with those reported in the literature [15,18]. The BET specific surface area of the synthesized perovskite, measure after calcined was 8 m 2 /g.…”

“…The BET specific surface area of the synthesized perovskite, measure after calcined was 8 m 2 /g. This value is typical for perovskites synthesized by the citrate sol-gel method [15]. The XRD pattern of synthesized perovskite shown in Figure 2, reveal the presence of crystalline LaNiO 3 .…”

“…After reduction, the system was swept with Ar for 30 min and adjusted to reaction temperature. The reaction was carried out at atmospheric pressure between 600˚C and 800˚C, 24 Lh -1 ·g -1 hourly space velocitie with a molar ratio CH 4 /O 2 = 2 for the combine reforming [15,22]. The water produced during reaction was condensed before passing the reactor outflow to the analyzing system, which consisted of an on-line gas chromatograph (Varian 3300) equipped with a TCD detector and provided with a Carbosieve SII 80/100 column.…”

“…Similarly, the type of catalyst used could also inhibit coke formation. In this sense, the use of perovskite type oxides emerge as an alternative since after reduction it is possible to produce highly disperse metallic particles, diminishing deactivation of the catalyst by suppressing the coke forming reactions [14][15][16][17][18]. However, the refractory character of heat conduction in perovskite oxides could be disadvantageous to the combined processes.…”

Production of perovskite catalysts on ceramic monoliths with nanoparticles for dual fuel system automobiles

“…Their mixed conductivity by both ion and electron migration and their high nonstoichiometric composition have been resulted from the basis of the applications of this group of materials in these areas such as electrochemistry (Kharton et al, 1999;Cheng et al, 2005) catalysis (Leontiou et al, 2003;Tao and Irvine, 2004;Liu et al, 2007) solid oxide fuel cells (Skinner, 2001;Uhlenbruck and Tietz, 2004) oxygen separation membranes (Takamura et al, 2004) chemical sensors for the detection of humidity (Holc et al, 1995) alcohol (Kong and Shen, 1996) and gases such as oxygen (Lukaszewicz et al, 1990), hydrocarbon (Brosha et al, 2000) and nitric oxide (Traversa et al, 1995). Earlier studies reported on perovskite oxide LaCo x Fe 1"x O 3 mainly involved methane oxidation catalysis (Szabo et al, 2003;Royer et al, 2004;Royer et al, 2005aRoyer et al, , 2005bGoldwasser et al, 2005). Incorporation of small amounts of precious metals into a perovskite structure can prevent their sintering, reduce losses due to volatilization at high operating temperatures and avoid reactions with the support that show the catalyst deactivation.…”