التفاصيل البيبلوغرافية
| العنوان: |
Desulphurisation of dibenzothiophene and 4,6 – dimethyl dibenzothiophene via enhanced hydrogenation reaction route using RePd–TiO2/SiO2 aerogel catalysts: Kinetic parameters estimation and modelling. |
| Alternate Title: |
Desulfurizacija dibenzotiofena i 4,6 – dimetildibenzotiofena procesom hidrogenovanja uz korišćenje RePd–TiO2/SiO2 aerogel katalizatora: proračun kinetičkih parametara i simulacijaprocesa. (Bosnian) |
| المؤلفون: |
Prokić-Vidojević, Dragana, Glišić, Sandra B., Pešić, Radojica, Orlović, Aleksandar M. |
| المصدر: |
Chemical Industry / Hemijska Industrija; 2022, Vol. 76 Issue 3, p135-145, 11p |
| مصطلحات موضوعية: |
HYDROGENATION, PARAMETER estimation, DIBENZOTHIOPHENE, AEROGELS, GAS chromatography/Mass spectrometry (GC-MS), CATALYSTS |
| Abstract (English): |
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.aerogel [ABSTRACT FROM AUTHOR] |
| Abstract (Bosnian): |
Re/Pd-TiO2/SiO² aerogel katalizatori su sintetizovani korišćenjem sol-gel metode i natkritičnog sušenja u višku rastvarača, i njihova katalitička aktivnost je ispitana u reakcijama hidrodesulfurizacije (HDS) dibenzotiofena (DBT) i 4,6-dimetildibenzotiofena (4,6-DMDBT). Oba Re/Pd katalizatora, dobijena sa ili bez mezitilena u procesu sinteze, su pokazala povećan stepen konverzije, za 70 %, u reakciji hidrodesulfurizacije 4,6-DMDBT u poređenju sa konvencionalnim Co/Mo katalizatorom koji se koristi u procesima hidroobrade. Ova zapažanja, veći stepen konverzije teško reagujućih 4,6-DMDBT u procesu hidroobrade, su značajna za dobijanje nisko-sumpornih dizel goriva (engl. ultra-low sulphur diesel fuels, ULSD). Kvantitativna analiza produkata hidrogenovanja DBT i 4,6-DMDBT, uključujući međuproizvode, izvedena je tehnikom gasne hromatografije – masene spektrometrije (engl. gas chromatography–mass spectrometry, GC-MS). Eksperimentalna reakcija je izvedena na 630 K i 60 bar u šaržnom katalitičkom reaktoru. Eksperimentalni podaci su korišćeni u okviru Hagen-Vatson (Hougen-Watson) kinetičkog modela koji opisuje proces hidrodesulfurizacije DBT i 4,6-DMDBT na σ i τ aktivnim centrima. Kinetički parametri su određeni korišćenjem numeričkih optimizacionih metoda, genetski algoritam simultano sa funkcijom minimuma odstupanja, i dobijeni rezultati pokazuju dobro slaganje sa eksperimentalnim podacima. Vrednosti izračunatih kinetičkih parametara kao i vrednosti selektivnosti (tj. odnosa metilcikloheksiltoluena i dimetilbifenila kao MCHT/(MCHT+DMBPH)) su potvrdile da je hidrogenovanje dominantni reakcioni put za hidrodesulfurizaciju 4,6-DMDBT. Potencijalne prednosti korišćenja Re/Pd aerogel katalizatora za konverziju 4,6-DMDBT potvrđene su i rezultatima uporednih simulacija ovog i konvencionalnog Co/Mo katalizatora. [ABSTRACT FROM AUTHOR] |
|
Copyright of Chemical Industry / Hemijska Industrija is the property of Association of Chemical Engineers and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Supplemental Index |