Desulphurisation of dibenzothiophene and 4,6 – dimethyl dibenzo¬thio-phene via enhanced hydrogenation reaction route using RePd–TiO2/SiO2 aerogel catalysts: Kinetic parameters estimation and modelling Original scientific paper

Main Article Content

Dragana Prokić-Vidojević
https://orcid.org/0000-0002-4677-9609
Sandra B. Glišić
https://orcid.org/0000-0002-0209-2258
Radojica Pešić
https://orcid.org/0000-0002-5547-7450
Aleksandar M. Orlović
https://orcid.org/0000-0003-2645-8768

Abstract

Re/Pd-TiO2/SiO2 aerogel catalysts were synthesized by using a sol-gel method and supercritical drying in excess solvent and investigated in the reaction of hydrodesulphurisation (HDS) of dibenzothiophene (DBT) and 4,6-dimethyl dibenzothiophene (4,6-DMDBT). Both Re/Pd catalysts, obtained with and without the use of mesitylene in the synthesis step, have shown increased conversions of up to 70 % in the desulphurization of 4,6-DMDBT, when compared to conventional Co/Mo hydroprocessing catalysts. This observation is of importance for conversion of highly refractory 4,6-DMDBT and hydroprocessing to produce ultra-low sulphur diesel fuels, ULSD. In order to quantify the extent of desulphurisation, which proceeds via a hydrogenation route, conversions of DBT and 4,6-DMDBT along with evolution of reaction products characteristic for the direct desulphurisation route and the hydrogenation route were monitored by using a gas chromatography–mass spectrometry (GC-MS) analytical technique. The reaction was performed at 630 K and 6 MPa in a batch catalytic reactor. The experimental results were used in the Hougen-Watson kinetic model describing DBT and 4,6-DMDBT desulphurisation on σ and τ active sites. Kinetic parameters of this complex catalytic kinetics were determined by using a Genetic Algorithm method and minimum deviation function. Values of calculated kinetic parameters and values of the ratio of 3-methylcyclohexyltoluene (MCHT and dimethyl biphenyl (DMBPH) expressed as the MCHT/(MCHT+DMBPH) ratio ranging between 0.66 and 0.94, have confirmed that the hydrogenation route is the dominant route for desulphurisation of 4,6-DMDBT.

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Prokić-Vidojević, D. ., Glišić, S. B., Pešić, R. ., & Orlović, A. M. (2022). Desulphurisation of dibenzothiophene and 4,6 – dimethyl dibenzo¬thio-phene via enhanced hydrogenation reaction route using RePd–TiO2/SiO2 aerogel catalysts: Kinetic parameters estimation and modelling: Original scientific paper. HEMIJSKA INDUSTRIJA, 76(3), 135–145. https://doi.org/10.2298/HEMIND220114008P
Section
Chemical Engineering - Reactor Engineering

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