Catalytic oxidation of sulfur and nitrogen compounds from diesel fuel

The oxidation of nitrogen or sulphur pollutants was monitored with electrospray ionization mass spectrometry. Quinoline, dibenzothiophene and methylene blue were found to be oxidized through a successive hydroxylation mechanism. These results strongly suggest that highly reactive hydroxyl radicals,...

Full description

Saved in:
Bibliographic Details
Published in:Applied catalysis. A, General General, 2009-06, Vol.360 (2), p.205-209
Main Authors: de Souza, Wladmir F., Guimarães, Iara R., Guerreiro, Mário César, Oliveira, Luiz C.A.
Format: Article
Language:English
Subjects:
Catalysis
Chemistry
Electrospray ionization
Exact sciences and technology
General and physical chemistry
Natural iron oxide
Oxidation process
Pollutant
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The oxidation of nitrogen or sulphur pollutants was monitored with electrospray ionization mass spectrometry. Quinoline, dibenzothiophene and methylene blue were found to be oxidized through a successive hydroxylation mechanism. These results strongly suggest that highly reactive hydroxyl radicals, generated during the reaction of H 2O 2 on the catalyst surface, are responsible for the oxidation. The oxidation of nitrogen or sulfur pollutants, using organic substrates as model compounds, was monitored with electrospray ionization mass spectrometry. Quinoline, dibenzothiophene and methylene blue were found to be oxidized through a successive hydroxylation mechanism. These results strongly suggest that highly reactive hydroxyl radicals, generated during the reaction of H 2O 2 on the catalyst surface, are responsible for this oxidation, and confirm that the material is an efficient heterogeneous Fenton-like catalyst, which is able to eliminate around 90% of the sulfur molecules. This is, therefore, an important and useful tool for the elimination of refractory sulfur in the hydrotreatment process with potential application to meet future environmental legislation indexes. It is important to remember that only the heteroatom fraction is degraded, preserving the hydrocarbons of interest in the diesel flows. The catalyst showed activity in successive oxidation cycles presenting a high regeneration capacity.
ISSN:0926-860X
1873-3875
DOI:10.1016/j.apcata.2009.03.023