INCAPE   05401
INSTITUTO DE INVESTIGACIONES EN CATALISIS Y PETROQUIMICA "ING. JOSE MIGUEL PARERA"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Study of the interactions of Pd,In with SiO2 and Al2O3 supports for the hydrogenation of nitrates in water. Effects of physical mixtures on catalytic behavior.
Autor/es:
F.A. MARCHESINI; NICOLAS PICARD; EDUARDO MIRÓ
Reunión:
Congreso; ICC 2012; 2012
Resumen:
The aim of this study is to use the supports properties taking advantage of the  highactivity in Al2O3 supports catalysts in combination with the better selectivity obtained in SiO2 supported one. To this end, we used solids with 1wt% Pd and 0.25wt% In and different support percentages (SiO2 and Al2O3). TPR, XRD, dynamic CO adsorption and FTIR of adsorbed CO were chosen as characterization tools and the activity measurements were carried out in a stirred batch reactor with an on-line pH control. It was found that (m) and (c) catalysts are active for nitrate and nitrite reduction using hydrogen as reductant agent. Particularly, those who have higher proportion of Al2O3 have higher nitrates conversion at100 min of reaction. The best conversion and selectivity results were obtained with AS T. In this catalyst probably the net surface charge is optimum and the metallic particle found the appropriated interaction to reduce the nitrates to nitrites in a selective way. The best conversion and selectivity results were obtained with AS T. In this catalyst probably the net surface charge is optimum and the metallic particle found the appropriated interaction to reduce the nitrates to nitrites in a selective way. Particularly, those who have higher proportion of Al2O3 have higher nitrates conversion at100 min of reaction. The best conversion and selectivity results were obtained with AS T. In this catalyst probably the net surface charge is optimum and the metallic particle found the appropriated interaction to reduce the nitrates to nitrites in a selective way. The best conversion and selectivity results were obtained with AS T. In this catalyst probably the net surface charge is optimum and the metallic particle found the appropriated interaction to reduce the nitrates to nitrites in a selective way. 2O3 supports catalysts in combination with the better selectivity obtained in SiO2 supported one. To this end, we used solids with 1wt% Pd and 0.25wt% In and different support percentages (SiO2 and Al2O3). TPR, XRD, dynamic CO adsorption and FTIR of adsorbed CO were chosen as characterization tools and the activity measurements were carried out in a stirred batch reactor with an on-line pH control. It was found that (m) and (c) catalysts are active for nitrate and nitrite reduction using hydrogen as reductant agent. Particularly, those who have higher proportion of Al2O3 have higher nitrates conversion at100 min of reaction. The best conversion and selectivity results were obtained with AS T. In this catalyst probably the net surface charge is optimum and the metallic particle found the appropriated interaction to reduce the nitrates to nitrites in a selective way. The best conversion and selectivity results were obtained with AS T. In this catalyst probably the net surface charge is optimum and the metallic particle found the appropriated interaction to reduce the nitrates to nitrites in a selective way. 2O3 have higher nitrates conversion at100 min of reaction. The best conversion and selectivity results were obtained with AS T. In this catalyst probably the net surface charge is optimum and the metallic particle found the appropriated interaction to reduce the nitrates to nitrites in a selective way.