MAGNETIC Fe3O4@SiO2-Pt AND Fe3O4@SiO2-Pt@SiO2 STRUCTURES FOR HDN OF INDOLE

ROBINSON DINAMARCA; VERÓNICA VALLES; BRENDA LEDESMA; CRISTIAN H. CAMPOS; GINA PECCHI; ANDREA BELTRAMONE

Congreso; XXVII Congreso Iberoamericano De Catálisis; 2020

The eect of a second porous SiO2 shell in the activity and selectivity of the Fe3O4@SiO2?Ptcatalyst in the hydrodenitrogenation of indole is reported. The double Fe3O4@SiO2?Pt@SiO2 structurewas prepared by coating Fe3O4 nanoparticles with tetraethyl orthosilicate (TEOS) with a furtherimpregnation of 1.0 wt.% of Pt on the (3-aminopropyl)triethoxysilane functionalized Fe3O4@SiO2structures. The second porous SiO2 shell, obtained by using a hexadecyltrimethylammoniumbromide (CTAB) template, covered the Fe3O4@SiO2?Pt catalyst with a well-defined and narrowpore-sized distribution. The full characterization by TEM, inductively coupled plasma-opticalemission spectroscopy (ICP-OES), XRD, and N2 adsorption isotherm at 77 K and vibrating samplemagnetometry (VSM) of the catalysts indicates homogeneous core@shell structures with a controllednano-size of metallic Pt. A significant eect of the double SiO2 shell in the catalytic performance wasdemonstrated by both a higher activity to eliminate the nitrogen atom of the indole molecule presentin model liquid fuel and the improvement of the catalytic stability reaching four consecutive reactioncycles with only a slight conversion level decrease.