Catalytic hydrodesulfurisation

Molybdenum Sulfide Nanoclusters and Catalytic Hydrodesulfurisation Reaction Pathways... 

In the case of palladium particles supported on magnesium oxide, Heiz and his colleagues have shown,29 in an elegant study, a correlation between the number of palladium atoms in a cluster and the selectivity for the conversion of acetylene to benzene, butadiene and butane, whereas in the industrially significant area of catalytic hydrodesulfurisation, the Aarhus group,33 with support from theory, have pinpointed by STM metallic edge states as the active sites in the MoS2 catalysts. 

On the Role of Catalyst Sulfur in Catalytic Hydrodesulfurisation Some Conclusions from Tracer Studies... 

P. Steiner and E.A. Blekkan, Catalytic hydrodesulfurisation of light gas oil Detailed product analysis and kinetics , CHISA 2000, Prague, 27-31 August 2000. 

A catalytic example of C-S bond breakage in benzothiophene has been reported by Bianchini [47], A catalytic desulfurisation was not yet achieved at the time as this is thermodynamically not feasible at such mild temperatures because of the relative stability of metal sulfides formed. Bianchini used a water-soluble catalyst in a two-phase system of heptane-methanol/water mixtures in which the product 2-ethylthiophenol is extracted into the basic aqueous layer containing NaOH. Figure 2.43 gives the reaction scheme and the catalyst. The 16-electron species Na(sulfos)RhH is suggested to be the catalyst. Note that a hydrodesulfurisation has not yet been achieved in this reaction because a thiol is the product. Under more forcing conditions the formation of H2S has been observed for various systems. 

Figure 8.11 Refinery flow scheme showing the processes for treatment of the different fractions of crude oil. The main processes that use zeolite catalysts are indicated by shading. (HDS-hydrodesulfurisation, HDT-hydrotreating, FCC-fluidised catalytic cracking) [Adapted from reference 89 with permission. Copyright 1997 Wiley-VCH Verlag GmbH Co. KGaA.]...

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