2016
J. A. Tavizón-Pozos, V. A. Suárez-Toriello, J. A. de los Reyes, A. Guevara-Lara, B. Pawelec, J. L. G. Fierro, M. Vrinat, C. Geantet. Deep Hydrodesulfurization of Dibenzothiophenes Over NiW Sulfide Catalysts Supported on Sol?Gel Titania?AluminaTop Catal (2016) 59: 241. doi:10.1007/s11244-015-0437-2
Abstract
This work showed that the use of Al2O3?TiO2 as carriers has a positive effect on the activity of supported NiW catalysts in the hydrodesulfurization of dibenzothiophene and 4,6-dimethyldibenzothiophene carried out in a batch reactor at 320 C and total H2 pressure of 5.5 MPa. Two Al2O3?TiO2 mixed oxides with Al/Ti atomic ratios of 10 and 2 were synthesized by sol?gel method together with the pure Al2O3 synthesized as reference support. For NiW/Al2O3?TiO2 and NiW/Al2O3 catalysts, a metal load of 17 and 5.5 wt% of W and Ni were considered respectively. It was found that both Al2O3?TiO2-supported catalysts exhibited higher activity than alumina-supported one. The catalyst with a largest TiO2 content (NiW/AT2) demonstrated to be 23 % more active with respect to NiW/Al2O3. Solids were characterized by temperature-programmed reduction (TPR), high resolution transmission electronic microscopy and X-ray photoelectronic spectroscopy (XPS) techniques. A decrease in support?metal interaction (from TPR) was observed when Ti content increased, which could lead to a higher amount of NiWS phase (from XPS). Besides, a slight increase in the slabs length in WS2 was observed for titania-containing catalyst with respect to NiW/Al2O3, indicating that the dispersion can still be optimized. The atomic ratio Al/Ti = 2 of the NiW/Al2O3?TiO2 catalyst proved to be a potential substitute for current catalysts for sulfur reduction in ultra-clean diesel.
Morphological and magnetic properties of cobalt nanoclusters electrodeposited onto HOPG
The role of temperature in copper electrocrystallization in ammoniachloride solutions
Mercury Ions Removal from Aqueous Solution Using an Activated Composite Membrane
Characterization of Main Anthocyanins Extracted from Pericarp Blue Corn by MALDI-ToF MS