New trends in the concept of catalytic sites over sulfide catalysts

Deep Hydrodesulphurization via Hydrogen Spillover

“…Bataille et al [23] proposed that two types of catalytic sites can be considered: the sites responsible for the HYD steps are composed of a vacancy associated with -SH groups and with a hydrogen atom adsorbed on a molybdenum atom; the other sites involved in the E 2 direct desulphurization route and more generally in C-S bond cleavage would be composed of two vacancies associated with a sulphur anion. In this regard, Vrinat et al [28] suggested a mechanism in which the probability of the reaction towards one route or the other depends on steric effects and on the sulphide's acid-base properties.…”

Aromaticity of five- and six-membered heterocycles present in crude oils – An electronic description for hydrotreatment process

“…Both values of basic nitrogen compounds increase with the number of fused benzene rings. Experimental work has shown the inhibition effect of these compounds in HDS of 4,6-dimethyldibenzothiophene (4,6-DMDBT) [40]. The inhibition of 4,6-DMDBT HDS over MoS 2 -based catalysts by polycondensed basic pydirine-type compounds increase with the number of fused benzene rings.…”

CONVERSION OF QUINOLINE ON ReS2 CATALYSTS: EFFECT OF THE SUPPORT AND THE ADDITION OF CS2 IN THE FEED

“…This change in the distribution suggests that the H 2 S may be modifying the active sites on the ReS 2 , decreasing the hydrogenation sites and favouring hydrogenolysis sites. However, Vrinat et al 16 demonstrated the existence of a single type of active site on sulphide catalysts. Therefore, the increase in N-free products in the presence of H 2 S on ReS 2 may be attributed to the fact that H 2 S is decreasing the metal nature of ReS 2 , diminishing its hydrogenating nature.…”