Preparation and characterization of highly active nanosized strontium-doped lanthanum cobaltate catalysts with high surface areas

Single-Crystalline La0.6Sr0.4CoO3-δ Nanowires/Nanorods Derived Hydrothermally Without the Use of a Template: Catalysts Highly Active for Toluene Complete Oxidation

“…2) result in significant drop in specific surface area. Nevertheless, it is noted that the surface area of La 0.6 Sr 0.4 CoO 3-d nanowires obtained after calcination at 650°C is much bigger than that of the 650°C-calcined La 0.6 Sr 0.4 CoO 3-d nanoparticles obtained by citric acid complexing method (17.1 m 2 /g) or by the citric acid complexing-hydrothermal synthesis coupled method (20.2 m 2 /g) reported by Niu et al[15].…”

“…The dried powders were well ground and heated in air at a rate of 1°C/min in a muffle furnace to 400°C and kept at this temperature for 2 h, and then heated to a selected temperature (650, 800, and 900°C) and maintained at this temperature for 2 h. The as-obtained catalysts are denoted as LSCO-650, LSCO-800, and LSCO-900 hereinafter, respectively. For comparison purpose, we also prepared a polycrystalline La 0.6 Sr 0.4 CoO 3-d catalyst adopting the citric acid-complexing procedure similar to that described in [15]. The polycrystalline La 0.6 Sr 0.4 CoO 3-d sample (denoted as LSCO-950-Citrate) was calcined at 950°C for 4 h. All the chemicals (analytical grade) were purchased from the Beijing Chemical Regent Company and were used without further purification.…”

“…There are three O1s signals at BE = 529.6-529.9, 531.4-531.9, and 533.1-533.6 eV. The one at BE = 529.6-529.9 eV was attributed to surface lattice oxygen (O 2À lattice ) [15,20,21] and the one at BE = 533.1-533.6 eV to adsorbed molecular water species [22]. In the preparation of single-crystalline catalysts, no carbon-containing precursors were used.…”

“…Among the materials, La 0.6 Sr 0.4 CoO 3-d is one of the best-performing catalysts for the oxidation of carbon monoxide and hydrocarbons [12][13][14][15]. Most authors believe that the catalytic activity of such a kind of materials is related to factors such as structural defects, B-site ion redox ability, and specific surface area [12][13][14][15][16]. Unfortunately, most of the methods for the preparation of ABO 3 materials could only give rise to condense materials of low surface area, mainly due to the need of high-temperature calcination for the formation of the ABO 3 phase.…”

Synthesis of nanometric LaCr0.5Mn0.5O3perovskite at low temperature by the polyvinyl alcohol gel combustion method

“…are known to be very good oxidation catalysts and cheaper than noble metal-supported catalysts for the oxidation of VOCs. [8,9] The ideal cubic perovskite structure, ABO 3 (S.G.Pm 3 m), consists essentially of a framework of BO 6 octahedra linked by their corners, with a large 12-coordinated A cation. The strong bonding between B-site ions and oxygen ions essentially determines the basic character of perovskite-type oxides.…”