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

ELECTROCHEMICAL STUDY ABOUT ZINC ELECTRODEPOSITION ONTO GCE AND HOPG SUBSTRATES

A Voltammetric Study Of The Underpotential Deposition Of Cobalt Onto A Glassy Carbon Electrode

Hydrogen bond studies in substituted N-(2-hydroxyphenyl)--2-[(4-methylbenzenesulfonyl)amino]acetamid...

Cobalt electrodeposition on polycrystalline palladium. Influence of temperature on kinetic parameter...

Synthesis and crystal structures of cis-palladium(II) and cis-platinum(II) complexes containing di...

Copper Electrodeposition On Glassy Carbon And Highly Oriented Pyrolytic Graphite Substrates From Per...

Analysis of the experimental pressuretemperature behavior in the isotropicnematic phase transition f...

Morphological and magnetic properties of cobalt nanoclusters electrodeposited onto HOPG

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

Nucleation and growth of cobalt onto different substrates: Part I. Underpotential deposition onto a ...