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The mechanism of formation of Pt@SiO2 as a model of core–shell nanoparticles via water-in-oil reverse microemulsions was studied in detail. By controlling the time of growth of Pt precursors, Pt(OH)x, after hydrolysis in NH3 aq. before adding SiO2 precursor (TEOS), Pt nanoparticles with a narrow size distribution were produced, from ultrafine metal nanoparticles (<1nm) to 6nm nanocrystals. Separately,...
CO oxidation is used as a probe reaction to evaluate the redox properties of catalysts for the low temperature oxidative dehydrogenation (ODH) of ethane. Three series of Nb 1−x -Ni x O nanocomposites with various Nb contents (x=1, 0.95, 0.90, 0.85, 0.80) are prepared by a sol–gel route based on citrate and tested in a 16 parallel fixed-bed unit. Reductive and oxidative pre-treatments...
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