A Mn(iii) polyoxotungstate in the oxidation of organosulfur compounds by H2O2 at room temperature: an environmentally safe catalytic approach

The tetrabutylammonium (TBA) salt of a Keggin-type polyoxometalate (POM), with the chemical formula TBA 4 H 2 [BW 11 Mn(H 2 O)O 39 ]·H 2 O, TBABW 11 Mn , was evaluated as a catalyst in the oxidation by hydrogen peroxide of several organosulfur compounds, namely benzothiophene (BT), 2-methylbenzothio...

Full description

Saved in:
Bibliographic Details
Main Authors: Duarte, Tiago A. G, Pires, Sónia M. G, Santos, Isabel C. M. S, Simões, Mário M. Q, Neves, M. Graça P. M. S, Cavaleiro, Ana M. V, Cavaleiro, José A. S
Format: Article
Language:
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The tetrabutylammonium (TBA) salt of a Keggin-type polyoxometalate (POM), with the chemical formula TBA 4 H 2 [BW 11 Mn(H 2 O)O 39 ]·H 2 O, TBABW 11 Mn , was evaluated as a catalyst in the oxidation by hydrogen peroxide of several organosulfur compounds, namely benzothiophene (BT), 2-methylbenzothiophene (2-MBT), 3-methylbenzothiophene (3-MBT), dibenzothiophene (DBT), 4-methyldibenzothiophene (4-MDBT) and 4,6-diethyldibenzothiophene (4,6-DEDBT), in acetonitrile at room temperature. All compounds were oxidized to their corresponding sulfones with high conversion and selectivity. Following the excellent results achieved, the BW 11 Mn /H 2 O 2 in CH 3 CN system was tested in the oxidation of model fuels (MFs) consisting of a mixture of BTs and DBTs in hexane ( MF1 containing mainly BTs and MF2 containing predominantly DBTs). In both cases, the organosulfur compounds from the model fuels were fully converted into their corresponding sulfones. Envisaging the development of a promising desulfurization procedure, the extraction of sulfur compounds from MF2 was attempted after the catalytic oxidation process. More than 98 mol% was removed using an ethanol/H 2 O mixture. A manganese monosubstituted Keggin-type polyoxometalate was used as a catalyst in the oxidation of recalcitrant organosulfur compounds by hydrogen peroxide at room temperature.
ISSN:2044-4753
2044-4761
DOI:10.1039/c5cy01564b