Pure and doped lanthanum cobaltites obtained by combustion method

Modified Catalysts and Their Fractal Properties

Obtaining high-area catalysts is in demand in heterogeneous catalysis as it influences the ratio between the number of active surface sites and the number of total surface sites of the catalysts. From this point of view, fractal theory seems to be a suitable instrument to characterize catalysts’ surfaces. Moreover, catalysts with higher fractal dimensions will perform better in catalytic reactions. Modifying catalysts to increase their fractal dimension is a constant concern in heterogeneous catalysis. In this paper, scientific results related to oxide catalysts, such as lanthanum cobaltites and ferrites with perovskite structure, and nanoparticle catalysts (such as Pt, Rh, Pt-Cu, etc.) will be reviewed, emphasizing their fractal properties and the influence of their modification on both fractal and catalytic properties. Some of the methods used to compute the fractal dimension of the catalysts (micrograph fractal analysis and the adsorption isotherm method) and the computed fractal dimensions will be presented and discussed.

Selective liquid phase benzyl alcohol oxidation over Cu-loaded LaFeO3 perovskite

Copper loaded LaMO₃ (M = Mn, Fe and Co) perovskites have been synthesized by a single-step solution combustion method.

Fabrication of Nanoperovskite Type Oxides and Its Efficient Usage on Removal of Trypan Blue Dye

A1-xAxBO3 belongs to the perovskite oxide, ABO3, structure. In this study, nanoparticles of La0.5Ca0.5FeO3 were fabricated by the sol–gel citrate technique. The family of perovskite-type oxides could be considered as an adsorbent material for the removal of dyes. This study has investigated the efficiency of La0.5Ca0.5FeO3, as an adsorbent for the removal of diazo dye Trypan Blue (TB), from an aqueous solution. The adsorption studies were carried out at different pH values, various adsorbent dosages and contact times in a batch experiment. The kinetic studies indicate that the removal process obeys a pseudo-first-order kinetic equation. Also, the isotherm evaluations reveal that the adsorption of TB by the nanoparticles follows the Langmuir model. This nanoparticle material, with good specific affinity towards dye molecules, is a promising adsorbent for dye removal from natural water.