Abstract:Pyridine hydrodenitrogenation (HDN) is more difficult than thiophene hydrodesulfurization (HDS), and there is a thermodynamic limitation on the first step of the HDN reaction mechanism which occurs, for example, at 5 to 11 bars, at temperatures above about 350°C. Pyridine inhibits the HDS reaction as previously reported, but sulfur compounds have a dual effect on HDN. At low temperatures, thiophene inhibits the reaction by competing with pyridine for hydrogenation sites on the catalyst. This retards the hydrog… Show more
“…For these reasons and in conformity with other authors [37][38][39], we assume that the two HDS pathways do not have a common intermediate and are determined by the conformation of the adsorbed DBT molecule. DDS occurs through σ adsorption of the DBT molecule via the sulfur atom, and HYD proceeds through π adsorption of the reactant via the aromatic system.…”
Section: Reaction Mechanisms and Catalytic Sitesmentioning
“…For these reasons and in conformity with other authors [37][38][39], we assume that the two HDS pathways do not have a common intermediate and are determined by the conformation of the adsorbed DBT molecule. DDS occurs through σ adsorption of the DBT molecule via the sulfur atom, and HYD proceeds through π adsorption of the reactant via the aromatic system.…”
Section: Reaction Mechanisms and Catalytic Sitesmentioning
“…The first systematic studies on simultaneous catalytic HDS and hydrodenitrogenation (HDN) were performed by Satterfield et al [19,20]. They investigated the interaction in the HDS of thiophene and HDN of pyridine.…”
“…Since hydrotreating and hydrocracking catalysts have acid sites, the basic organic nitrogen compound are characterized as strong HDS inhibitors and a fair amount of work have been devoted to thiophene and benzothiophene reaction networks [2][3][4][5][6][7]. Reported results on the inhibition of non-basic organic nitrogen compound are available [8,9].…”
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