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

Kallinikos, LE; Jess, A; Papayannakos, NG

dc.contributor.author	Kallinikos, LE	en
dc.contributor.author	Jess, A	en
dc.contributor.author	Papayannakos, NG	en
dc.date.accessioned	2014-03-01T01:33:41Z
dc.date.available	2014-03-01T01:33:41Z
dc.date.issued	2010	en
dc.identifier.issn	0021-9517	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20531
dc.subject	Desulfurization	en
dc.subject	Dibenzothiophenes	en
dc.subject	Hydrogen sulfide effect	en
dc.subject	Refractory compounds	en
dc.subject	Spiral mini-bed reactor	en
dc.subject.classification	Chemistry, Physical	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.other	Active site	en
dc.subject.other	Bed reactors	en
dc.subject.other	Commercial operation	en
dc.subject.other	Deep desulfurization	en
dc.subject.other	Dibenzothiophenes	en
dc.subject.other	Heavy gasoil	en
dc.subject.other	Hydrotreating	en
dc.subject.other	Inhibiting effect	en
dc.subject.other	Kinetic study	en
dc.subject.other	Liquid hourly space velocity	en
dc.subject.other	Refractory compounds	en
dc.subject.other	S effect	en
dc.subject.other	Spiral mini-bed reactor	en
dc.subject.other	Sulfur component	en
dc.subject.other	Tetramethyl	en
dc.subject.other	Total pressure	en
dc.subject.other	Total sulfur	en
dc.subject.other	Trimethyl	en
dc.subject.other	Activation energy	en
dc.subject.other	Catalysts	en
dc.subject.other	Hydrodesulfurization	en
dc.subject.other	Hydrogen	en
dc.subject.other	Hydrogen sulfide	en
dc.subject.other	Hydrogenation	en
dc.subject.other	Liquids	en
dc.subject.other	Organic polymers	en
dc.subject.other	Refractory materials	en
dc.subject.other	Sulfur	en
dc.subject.other	Sulfur determination	en
dc.subject.other	Chemical contamination	en
dc.title	Kinetic study and H2S effect on refractory DBTs desulfurization in a heavy gasoil	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.jcat.2009.11.005	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.jcat.2009.11.005	en
heal.language	English	en
heal.publicationDate	2010	en
heal.abstract	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/gamma-Al2O3 catalyst under commercial operation conditions of temperature (563-623 K), total pressure (50 x 10(5) Pa), liquid hourly space velocity (LHSV) (0.7-3 h(-1)), and gas-to-liquid ratio (400-600 Nm(H2)(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. (c) 2009 Elsevier Inc. All rights reserved.	en
heal.publisher	ACADEMIC PRESS INC ELSEVIER SCIENCE	en
heal.journalName	Journal of Catalysis	en
dc.identifier.doi	10.1016/j.jcat.2009.11.005	en
dc.identifier.isi	ISI:000274042600019	en
dc.identifier.volume	269	en
dc.identifier.issue	1	en
dc.identifier.spage	169	en
dc.identifier.epage	178	en