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oai:uvadoc.uva.es:10324/233752021-06-24T07:46:15Zcom_10324_31661com_10324_952com_10324_894com_10324_1173com_10324_931col_10324_31662col_10324_1371

00925njm 22002777a 4500 dc Sanz Moral, Luis Miguel author Romero, Alberto author Holz, Fabian author Rueda Noriega, Miriam author Navarrete, Alexander author Martín Martínez, Ángel author 2016 Pd nanoparticles have been embedded on silica aerogel by using three different techniques. In each of them the metal was loaded in the matrix at different steps of the production: the direct synthesis, the wet impregnation and the supercritical impregnation of the previously dried aerogels. The resultant materials have been characterized to analyze the differences depending on the applied technique for its impregnation. Atomic absorption, nitrogen physisorption, X-ray diffraction, infrared spectroscopy and transmission electron microscopy where performed. In all the techniques the concentration of metal has been varied (from 0.13 to 1.61 % wt.) by modifying the concentration of the suspension (Pd-polyvinylpyrrolidone nanoparticles used in the direct synthesis) or of the solution of the metallic precursor (palladium acetylacetonate), both in the organic solvent and the supercritical media. The characterization had generally shown a good distribution of the metallic particles in the matrix, and the negligible effect of the metal on the textural properties. Finally, considerable variations where observed on the silanol groups on the surface of the catalysts. These materials were tested in D-glucose hydrogenation, observing significant differences on the performance of the catalyst depending on the synthesis technique employed. Journal of the Taiwan Institute of Chemical Engineers 65 (2016) 515–521 http://uvadoc.uva.es/handle/10324/23375 Tuned Pd/SiO 2 aerogel catalyst prepared by different synthesis techniques