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Edwin Oviedo

Leading speaker for catalysis conferences - Edwin Oviedo

Title: Calcined tertiaries hydrotalcites as supports of como based catalysts for the hydrodesulfurization reaction of dibenzothiophene

Edwin Oviedo

University of Carabobo, Venezuela


PhD student 2012-present (nowadays finishing) joining two universities: University of Carabobo, Venezuela and IC2MP, University of Poitiers, France under the support and funding  of      Program  of  Post  Grade  Cooperative  France-Venezuela.  Besides,  Chemist
Researcher, Faculty of Engineering, University of Carabobo, Venezuela. Developer of news materials used like catalysts with high potential in hydrotreatment reactions.


Nowadays, light conventional crude oils are going down. Therefore, the exploitation of heavy crude oils has been increasing. Hence, a major quantity of refractory sulfur compounds such as dibenzothiophene (DBT) should be removed. Many efforts have been carried out to modify hydrotreatment typical supports in order to increase hydrodesulfurization (HDS) reactions. The present work shows the synthesis of tertiaries MgFeAl(0.16) , MgFeAl(0.32) , CoFeAl, ZnFeAl hydrotalcites, as supports of CoMo based catalysts, where 0.16 and 0.32 are the Fe3+/Al3+ molar ratio. Solids were characterized by different techniques (XRD, CO2-TPD, H2-TPR, FT-IR, BET, Chemical Analysis and HRTEM) and tested in the DBT HDS reaction. The reactions conditions were: Temp=325°C, P=40 Bar, H2/feed=475. Results show that the catalysts CoMo/MgFeAl(0.16) and CoMo/MgFeAl(0.32), which were the most basics, reduced the sulfur content from 500ppm to less than 1 ppm, increasing the cyclohexylbenzene content, i.e. presented a higher selective toward the HYD pathway than reference catalyst CoMo/γ- Al2O3 . This is suitable for improvement the fuel quality due to the increasing of the cetane number. These catalysts were also more active to the HDS reaction increasing the direct desulfurization (DDS) way and presented a good stability. It is advantageous when the gas oil centane number should be improved. Cobalt, iron or zinc species inside support could avoid the Co and Mo dispersion or form spinel species which could be less active to hydrodesulfuration reactions, while hydrotalcites containing Mg increases the HDS activity probably due to improved Co/Mo ratio