0000000000814233
AUTHOR
A. Beltrán Porter
Synthesis of high surface area perovskite catalysts by non-conventional routes
Abstract The use of rare earth-containing perovskite oxides as total oxidation catalysts faces to the difficulty of obtaining high surface area materials and the need of calcination at high temperatures for its synthesis. In this work, perovskite NdCoO3 catalysts with relatively high surface areas were synthesized at soft calcination conditions by two non-conventional routes: heteronuclear organic complexes and amorphous precursors obtained by freeze-drying of nitrates solutions. Depending on the method used, different degrees of homogeneity in the bulk distribution of the component cations, oxygen non-stoichiometry as well as surface Co/Nd atomic ratios are obtained. In this way, the synth…
Complexes of tungsten (VI) with tartaric acid. Comparative study of the various schemes of formation
The complex formation occurring between tungstic acid and tartaric acid has been investigated in order to explain the optical activity of tartaric acid in the presence of constant amounts of tungstic acid. A new scheme of formation that includes three different complexes is presented, which explains the experimental results found in the literature.