Patent ID: 7829493
Filing Date: 2010-11-09
Classification: A01N,B01J,Y10S,Y10T

Abstract:
1. A method for preparing metallic nanoparticles homogeneously dispersed on a support wherein the support is, at least one clay, possessing a silicate network, selected from sepiolite and atapulgite, and a metallic precursor is, at least one precursor selected from metallic salts, hydroxides and oxides, the metallic element is selected from metallic elements susceptible to reduction at temperatures below the destruction temperature of the clay's silicate network, and the method additionally comprises, an acidification stage of the metallic precursor, a deposition stage in which the precursor deposits on the support, a thermal decomposition stage, when the precursor is selected from salts and hydroxides, that is carried out under controlled atmosphere conditions and in which the precursor is subjected to a decomposition treatment where the precursor is transformed into an oxide of the metallic element, and a thermal reduction stage carried out under controlled conditions in which the oxide of the metallic element is subjected to a reduction process to obtain nanoparticles of the metallic element deposited on the support, the procedure is carried out at temperatures below the destruction temperature of the clay's silicate network and results in the obtention of metallic nanoparticles whose size is smaller than 30 nm.