Oxidation of sulfur-containing compounds

Complete oxidation of H2S to S02 can be achieved by incorporating a metal function into the zeolite. For example, vanadium on mordenite has been claimed (62) to be a very effective catalyst for this reaction. 

Pearce and Lunsford (63) demonstrated that Mn2 + Y was an active catalyst for SOz oxidation at ambient temperature. The product SOj was, 

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NH4)6Mo7024 supported on a cross-linked polystyrene has also been used for the selective oxidation of sulfur-containing compounds with H2O2 (209, 262). An example of interest is the selective conversion of penicillin G to the sulfoxide, an important intermediate for cephalosporin antibiotics ... 

The reaction of ozone with hydrogen sulfide is not nearly so well understood as other reactions involving oxidation of sulfur-containing compounds. It was early believed that the reaction gave sulfur and water. 

Oxidation of sulfur-containing compounds is a well-known procedure. In principle all sulfur-containing 6n- or 8tt-systems are oxidized to the corresponding 5-oxides or S, 5-dioxides. 

The presence of a silica framework with few defects makes TS-1 a highly hydrophobic material suitable for oxidations in the liquid phase with H2O2 as oxidant. Thus, TS-1 has proven to be successful in the oxidation of alcohols, epox-idation of linear olefins, hydroxylation of aromatics, ammoximation of cyclohexanone, oxidation of alkanes to alcohols and ketones, oxidation of amines, oxidation of sulfur-containing compounds, and oxidation of ethers [66-75]. 

Oxidation of sulfur-containing compounds. A new procedure for oxidation of sulfides to sulfoxides uses r-BuOOH in aqueous H2SO4 at ambient temperature (95-100% yield). Interestingly, 4-(methylthio)benzaldehyde is oxidized to the sulfone carboxylic acid in 0.5M NaOH at 70°C, but in the presence of cetyltrimethylammo-nium sulfate (and IM NaOH) at room temperature the sulfide remains untouched. ... 

The catalytic oxidation of sulfur-containing compounds has been studied mostly on the examples of thioethers and thiols, which are most often encountered in petrochemical industry. Elimination of the foul odor arising from thiols (mercaptans) contained in some oils ("sweetening") is mostly carried out by oxidation of thiols to disulfides. The oxidation of sulfur salts is also of practical importance in the processing of sulfide ores and handling the... 

Different quaternary ammonium cations and heteropoly tungstophosphate ions were combined together to develop emulsion systems for the ODS of diesel. The oxidation of sulfur-containing compounds (BT, benzothiophene DBT, dibenzoth-iophene and their derivatives) in diesel has been carried out (see Scheme 8.2). 4,6-DMDBT was initially used as a model molecule for the oxidation test because it represents the most refractory sulfur-containing molecules in fuels. 4,6-DMDBT and its derivatives have the lowest reactivity in H DS reactions and they are the major... 

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