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Abstract
The kinetic study of the thiophene hydrodesulphurisation process was carried out for CoMo/gama-Al2O3 catalyst, at temperatures between 175 and 275 �C, pressure ranged from 30bar to 60 bar and the liquid hourly space velocity from 1h-1 to 4 h-1. For the reaction mechanism, the Langmuir-Hinshelwood-Hougen-Watson model (LHHW) was used and two kinetic models were proposed: the first model, that considered that H2 is adsorbed on a different type of active center than thiophene and the second model, that considered that the two reactants are adsorbed on the same type of active sites. The values obtained for the average relative error (ARE) and the correlation coefficient between the experimental and the calculated data (R2) indicate that the Langmuir-Hinshelwood model, describing the adsorption on two active sites, best describes the kinetics of the thiophene hydrodesulfurization reaction over CoMo/gama-Al2O3 tested catalyst.
Highlights
(LHHW) was adsorbed on a used and two kinetic different type of active cmenotdeerltshwanetrheiopprhoepnoeseadn:dththeefsiresctomndodmeol,dtehl,atthcaot ncosindseidreedretdhathtaHt t2hies two reactants are adsorbed on the same type of active sites
Hydrodesulfurization (HDS), the catalytic chemical process widely used to remove sulfur (S) from natural gas and from refined petroleum products, occur through two main pathways: direct desulfurization (DDS), with the cleavage of C-S bond, or hydrogenation (HYD), which involves the formation of partially hydrogenated intermediates which further react to cyclohexylbenzene and bicyclohexyl [46]
Hinshelwood-Hougen-Watson model (LHHW) was used and two kinetic models were proposed: the first model, tahcatitvceocnesnidteerrethdatnhatht iHo2pihseandesaonrbdetdheonseacodnifdfermenotdteylp, ethoatf considered that the two reactants are adsorbed on the same type of active sites
Summary
(LHHW) was adsorbed on a used and two kinetic different type of active cmenotdeerltshwanetrheiopprhoepnoeseadn:dththeefsiresctomndodmeol,dtehl,atthcaot ncosindseidreedretdhathtaHt t2hies two reactants are adsorbed on the same type of active sites. Hydrodesulfurization (HDS), the catalytic chemical process widely used to remove sulfur (S) from natural gas and from refined petroleum products, occur through two main pathways: direct desulfurization (DDS), with the cleavage of C-S bond, or hydrogenation (HYD), which involves the formation of partially hydrogenated intermediates which further react to cyclohexylbenzene and bicyclohexyl [46]. The model compounds most frequently used, in order to develop kinetic expressions and reaction pathways that describe the HDS process, are heteroatomic aromatics (thiophenes): thiophene, benzothiophene and dibenzothiophene.
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