STUDY ON THE CATALYTIC OXIDATION OF DIESEL ENGINE SOOT USING IRON OXIDE CATALYSTS
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Date
2011
Journal Title
Journal ISSN
Volume Title
Publisher
DEPARTMENT OF ENVIRONMENTAL SCIENCES
Abstract
The wish of all concerned with air pollution is to have a completely unpolluted
environmentat no cost to anyone. That appears to be impossible, so our logical goal is
to have an appropriately clean environment, obtained at an appropriate cost. The main
objective of this research was to control the most annoying air pollutant (soot),
emitting from fossil fuel combustion sources, through catalysis. To meet the future
soot and other pollutants regulations it is necessary to develop such catalyst systems
with the help of whichan efficient removal of soot will be possible.
In the present work an environmentally friendly; noble metal free oxidation
catalyst Fe,O; was search out. For the catalytic soot oxidation first Fe,O; was
characterized by surface area measurement, scanning electron microscopy, and powder
X-ray diffraction analysis. The synthesized catalyst was tested for the diesel model
exhaust gas using temperature programmed oxidation technique. In this research a
particular emphasis was given to the catalytic oxidation of soot on iron oxide.
The diesel model soot was prepared by burning a lean C3H¢/O, mixture in a
diffusion flame and is subsequently collected with a sinter metal filter. The propene
soot as well as other carbon samples (graphite, printex, and activated charcoal) were
characterized by surface area measurement, scanning electron microscopy, Fourier
transform infrared
spectroscopy,
temperature programmed
desorption,
thermogravimatry, and powder X-ray diffraction analysis.
The investigation was carried out by using temperature programmed oxidation.
The TPO performance in the presence of FeO; with 6, 12, 18, and 20 vol.-% O; leads
to a stronger increase in soot oxidation, than the absence of catalyst.
FTIR spectroscopy was used for the identification of different surface groups on
the soot surface. Different types of surface groups were identified including carbonyl,
lactone, aldehyde, carboxylic, ether, etc