INCAPE   05401
INSTITUTO DE INVESTIGACIONES EN CATALISIS Y PETROQUIMICA "ING. JOSE MIGUEL PARERA"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Catalysts based on copper nanoparticles and its performance for the NOX reduction with H2
Autor/es:
ESTEBAN GIORIA; LAURA GUTIERREZ; ANTONELLA GIORELLO
Lugar:
santa fe
Reunión:
Conferencia; VI San Luis Conference on Surfaces, Interfaces and Catalysis; 2018
Resumen:
In this work, the synthesis of Cu/SiO2 catalysts from copper nanoparticles (CuNP) suspensions were proposed. Two different protocols for the CuNP synthesis were carried out: (i) a green one, using water as solvent and ascorbic acid as reducer and capping agent [1], and (ii) a protocol involving ethylene glycol as solvent, sodium hypophosphite as reducer and CTAB+PVP as capping agents [2]. In order to confirm the advantages of this preparation procedures, a third catalyst was prepared by the conventional mechanical mixing of CuO with SiO2. The catalysts were tested in the temperature range 300 to 500 °C for the Catalytic Selective Reduction of NOX with H2, reaction of environmental interest due to the well-known nocive effects of nitric oxides (acid rain, photochemical smog, and so on)[3], [4].All materials were characterized by X-ray diffraction (XRD), temperature programed reduction cycles (TPR), fluorescence of X-rays spectrometry, laser Raman spectroscopy and N2 adsorption for specific surface BET measurements. The catalyst prepared from the aqueous suspension resulted active and selective at the lowest temperature analyzed (300°C), while the solid synthesized with the CuNP suspended in DEG presented activity at higher temperature. Whereas the metal-support mechanical mixture showed very low yield for the tested reaction.The nanoparticles size and active centre distribution on the support would be the main parameters that control the catalytic site dispersion and the metal-support interaction. Moreover, the catalyst obtained from the aqueous suspension gave rise to the best catalytic results.