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Journal of Chemistry
Volume 2014 (2014), Article ID 679281, 10 pages
http://dx.doi.org/10.1155/2014/679281
Research Article

Monometallic Pd and Pt and Bimetallic Pd-Pt/Al2O3-TiO2 for the HDS of DBT: Effect of the Pd and Pt Incorporation Method

1Departamento de Ingeniería Metalúrgica, ESIQIE-Instituto Politécnico Nacional, 07300 México, DF, Mexico
2Departamento de Biociencias e Ingeniería, CIIEMAD-Instituto Politécnico Nacional, 07340 México, DF, Mexico
3Instituto Mexicano del Petróleo, Eje Central 152, 07730 México, DF, Mexico

Received 15 August 2014; Accepted 30 October 2014; Published 26 November 2014

Academic Editor: Davut Avci

Copyright © 2014 Reynaldo Martínez Guerrero et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The effect of the preparation method of monometallic Pd and Pt and bimetallic Pd-Pt/Al2O3-TiO2 catalysts on the hydrodesulfurization (HDS) of dibenzothiophene (DBT) was investigated in this study. The synthesis was accomplished using three methods: (A) impregnation, (B) metal organic chemical vapor deposition (MOCVD), and (C) impregnation-MOCVD. The bimetallic Pd-Pt catalyst prepared by the impregnation-MOCVD method was most active for the HDS of DBT compared to those prepared by the single impregnation or MOCVD method due to the synergetic effect between both noble metals. The greater selectivity toward biphenyl indicated that this bimetallic Pd-Pt catalyst preferentially removes sulfur via the direct desulfurization mechanism. However, the bimetallic Pd-Pt catalyst prepared using the single MOCVD method did not produce any cyclohexylbenzene, which is most likely associated with the hydrogenation/dehydrogenation sites.