Producción Científica Profesorado

Synthesis, characterization and catalytic activity during hydrodesulphurization of dibenzothiophene of NiMoW catalysts supported on Al-ATi mixed oxides modified with MgO



Guevara Lara, Alfredo

2012

Cervantes-Gaxiola, ME; Arroyo-Albiter, M ;Maya-Yescas, R ; Rico-Cerda, JL; Guevara-Lara, A; Espino-Valencia, J., Synthesis, characterization and catalytic activity during hydrodesulphurization of dibenzothiophene of NiMoW catalysts supported on Al-ATi mixed oxides modified with MgO, FUEL, Año: 2012 Volume: 100 Pages: 57-65 DOI: 10.1016/j.fuel.2011.12.040


Abstract


Four Al-Ti-Mg mixed oxide supports were synthesized by the sol-gel method, adding different MgO loadings (0, 5, 10 and 20 wt.%). The samples were characterized by XRD, N-2 physisorption, FT-IR spectroscopy, FT-IR pyridine adsorption and UV-Vis DRS. The supports exhibited amorphous mesoporous structures, with average pore size between 3.8 and 7.8 nm and high specific surface areas (170-280 m(2) g(-1)); also, they showed a small presence of carbonates species and weak acid Lewis sites. Synthesized supports were co-impregnated with Ni, Mo and W salts at atomic ratio of Ni/[Ni + (Mo + W)] = 0.5. The catalysts were characterized by XRD, N-2 physisorption, UV-Vis DRS, Raman spectroscopy and TEM. Catalytic activity and selectivity were evaluated in the hydrodesulphurization (HDS) of dibenzothiophene (DBT) reaction; the results are discussed in terms of the MgO loading to the support. The best catalyst was NiMoW/Al-Ti-Mg catalyst with 5 wt.% of MgO, which showed better HDS activity than NiMoW/Al-Ti and a similar performance to that observed for the NiMo/Al2O3 reference catalyst. The activity observed could be correlated to the distribution of active phases on support as well as the pore size distribution. Also, it was found that the direct desulphurization (DDS) pathway was favoured by the trimetallic catalysts; however, the addition of a small loading of MgO (5 wt.%) showed a slightly gain towards the hydrogenation pathway (HYD)



Producto de Investigación




Artículos relacionados

Influence of the Cation Nature of the Sulphate Salt on the Electrochemical Synthesis of Sulfate-Dope...

Nucleation and Growth Kinetics of Electrodeposited Sulfate-Doped Polypyrrole: Determination of the D...

Estudio de las Interacciones Ácido Húmico-Metales Pesados y Determinación de sus Constantes de Estab...

THEORETICAL STUDY ON THE MODIFICATION OF ACTIVE SITES IN GOLD SURFACES MODELED AS FINITE CLUSTERS: I...

A theoretical quantum study on the distribution of electrophilic and nucleophilic active sites on th...

Revisión de variables de diseño y condiciones de operación en la electrocoagulación

Morphological and magnetic properties of cobalt nanoclusters electrodeposited onto HOPG

Theoretical and Experimental Study of Cobalt Nucleation and Growth onto Gold Substrate with Differen...

Mercury Ions Removal from Aqueous Solution Using an Activated Composite Membrane

Chemical Reactivity of Atrazine Employing the Fukui Function