2011
Alida Elizabeth Cruz-Perez, Alfredo Guevara -Lara, Judith Pilar Morales-Ceron, Alejandro Alvarez-Hernandez, José Antonio de los Reyes, Laurence Massin, Christophe Geantet and Michel Vrinat, Catalysis Today, (2011), en prensa. doi:10.1016/j.physletb.2003.10.071, ISSN: 0920-5861, Factor de Impacto (2010): 3.526
Abstract
In order to determine the species distribution at different steps of catalyst preparation, NiW/TiO2Al2O3 catalysts were prepared by aqueous impregnation with solutions at pH = 4 and 9, respectively. Raman and UVVis diffuse reflectance spectroscopies for NiW/TiO2Al2O3 precursors showed that during impregnation step Ni2+OhW12O4110? entities were formed for pH = 4 and 9. After calcination, Ni2+Oh/WO42? and Ni2+OhW12O4110? species were identified for solids synthesized at pH = 4 and at pH = 9, respectively. Calcined catalyst impregnated at pH 4 displayed the highest Dibenzothiophene (DBT) hydrodesulfurization (HDS) activity for this series. This high activity was related to a higher concentration for the NiWS phase for the catalyst prepared at pH = 4 than that at pH = 9, as evidenced by X-ray photoelectron spectroscopy (XPS). It could be suggested that impregnation at pH = 9 allowed a high NiW interaction, forming Ni2+OhW12O4110? precursor and consequently, an inefficient sulfidation. Besides, for catalyst impregnated at pH 4, Ni2+Oh/WO42? precursor underwent a more complete transformation to NiWS phase and led to a higher DBT HDS activity.
Morphological and magnetic properties of cobalt nanoclusters electrodeposited onto HOPG
Do Spiroarsoranes Exhibit Polytopal Equilibrium in Solution?
Zinc Electrodeposition from Chloride Solutions onto Glassy Carbon Electrode
ELECTROCHEMICAL STUDY ABOUT ZINC ELECTRODEPOSITION ONTO GCE AND HOPG SUBSTRATES
Synthesis of Zn compounds derived from 1H-benzimidazol-2-ylmethanamine