Hydrodesulfurization of Dibenzothiophene on a CoNiMo Catalyst

Rami Doukeh,Traian Juganaru,Ion Bolocan

doi:10.37358/rc.19.9.7502

Abstract

In order to evaluate the performance of CoNiMo/g-Al2O3, the hydrogenolysis of dibenzothiophene was carried out. The conversion of dibenzothiophene, the yields of the reaction products and the unconverted sulfur content, expressed in ppm, were determined, at different temperatures in the catalytic layer (300�C-360�C), pressures (40 bar-60 bar) and liquid hourly space velocity (1-4h-1). The hydrodesulphurization catalyst was characterized by: determining the textural characteristics (BET specific surface area, mean pore diameter and pore volume), the acidic strength distribution, morphological analysis (scanning electron microscopy - SEM) and by identification of the species (X-ray diffraction � XRD). The analysis of the textural characteristics results in an ordered mesoporous structure of the catalyst, with a specific area of 280 m2/g and a medium pore diameter of 4.42 nm. At high temperature of 360�C and pressure of 60bar, the CoNiMo/ g-Al2O3 exhibit a good activity in hydrodesulphurization, with a 100% conversion of dibenzotiophene.

Highlights

Hydrodesulfurization of Dibenzothiophene on a CoNiMo CatalystThere are a lot of possibilities for hydrodesulfurization catalysts, and their choice in refineries usually adapts to the characteristics of the petroleum fractions and to the specifications of the refined product
OInuot.rdTehretocoenvavelurasitoenthoefpdeibrfeonrmzoatnhcioepohfeCnoeN, itMheo/yγi-eAlld2Os 3o, fththeehyredarocgtieonnoplyrsoisduofcdtsibaenndzoththeioupnhceonnevewratesdcasrurlifeudr content, expressed in ppm, were determined, at different temperatures in the catalytic layer (300°C-360°C), pressures (40 bar-60 bar) and liquid hourly space velocity (1-4h-1)
There are a lot of possibilities for hydrodesulfurization catalysts, and their choice in refineries usually adapts to the characteristics of the petroleum fractions and to the specifications of the refined product

Summary

Hydrodesulfurization of Dibenzothiophene on a CoNiMo Catalyst

There are a lot of possibilities for hydrodesulfurization catalysts, and their choice in refineries usually adapts to the characteristics of the petroleum fractions and to the specifications of the refined product. The activities of metal sulphides (supported or not), for the hydrodesulphurization of thiophene [15,16] and benzothiophene [17] depend on the position of the metal in the periodic system. Even though there are small differences between studies, all show that transition metals in the second and third groups have a volcano-type dependence between activity and position in the periodic system, and are generally more active than those in the first column, le Ru, Os, Rh, Ir [18], widely used industrial catalyst

Experimental part

Catalyst characterization

Conclusions