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Kinetic study and H2S effect on refractory DBTs desulfurization in a heavy gasoil

Title data

Kallinikos, Leonidas E. ; Jess, Andreas ; Papayannakos, Nikos G.:
Kinetic study and H2S effect on refractory DBTs desulfurization in a heavy gasoil.
In: Journal of Catalysis. Vol. 269 (2010) Issue 1 . - pp. 169-178.
ISSN 0021-9517
DOI: https://doi.org/10.1016/j.jcat.2009.11.005

Official URL: Volltext

Abstract in another language

The removal evolution of six refractory individual S-compounds, i.e. DBT, 4-methyl-DBT, 4,6-dimethyl-DBT, 4-ethyl-6-methyl-DBT, 2,4,6-trimethyl-DBT, and 2,4,6,8-tetramethyl-DBT, and five groups of S-compounds with one to four substitutions has been studied during the deep desulfurization process of a heavy gasoil in a mini scale-structured bed reactor. The reactivity of the sulfur compounds was investigated by hydrotreating the gasoil with a commercial NiMo/γ-Al2O3 catalyst under commercial operation conditions of temperature (563–623 K), total pressure (50 × 105 Pa), liquid hourly space velocity (LHSV) (0.7–3 h−1), and gas-to-liquid ratio (400–600 Nm H 2 3 / m oil 3 ). Moreover, the inhibiting effect of the hydrogen sulfide on the hydrodesulfurization rates of the S-compounds has been studied by performing tests with various H2S partial pressures. The results showed that the most refractory sulfur component is the 4,6-dimethyl-DBT constituting the major compound in the hydrotreated product with 50 ppm total sulfur and practically the only S-compound in the product with 10 ppm total sulfur. It has been verified that differences in HDS reactivity among DBT, 4-methyl-DBT, and 4,6-dimethyl-DBT in the real feed are lower than those commonly referred to in model feeds. The reactivity of the S-compounds is affected by the presence of the adsorbed on the catalyst active sites hydrogen sulfide and this effect appears decreasing with the number of the substituents of DBTs. The activation energy of DBTs obtained in the current work appears to be higher for the non-substituted DBT, which mainly reacts through the hydrogenolysis route, and to decrease for the substituted DBTs, which react through the hydrogenation route.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Desulfurization; Dibenzothiophenes; Refractory compounds; Hydrogen sulfide effect; Spiral mini-bed reactor
Institutions of the University: Faculties
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Chemical Engineering
Faculties > Faculty of Engineering Science > Chair Chemical Engineering > Chair Chemical Engineering - Univ.-Prof. Dr.-Ing. Andreas Jess
Research Institutions > Research Units > ZET - Zentrum für Energietechnik
Research Institutions
Research Institutions > Research Units
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
600 Technology, medicine, applied sciences > 600 Technology
600 Technology, medicine, applied sciences > 620 Engineering
600 Technology, medicine, applied sciences > 660 Chemical engineering
Date Deposited: 02 Feb 2015 10:20
Last Modified: 28 Feb 2019 10:47
URI: https://eref.uni-bayreuth.de/id/eprint/6143