10.1021/ie300807a.s002
Manohar
Kumar Bolla
Manohar
Kumar
Bolla
Hanif A. Choudhury
Hanif A.
Choudhury
Vijayanand S. Moholkar
Vijayanand S.
Moholkar
Mechanistic Features of
Ultrasound-Assisted Oxidative
Desulfurization of Liquid Fuels
American Chemical Society
2012
ultrasound
oxidative desulfurization system
oxidation system
cavitation
oxidative desulfurization
hexane vapor entrapped
2012-07-25 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Mechanistic_Features_of_Ultrasound_Assisted_Oxidative_Desulfurization_of_Liquid_Fuels/2501995
A new technology for the removal of sulfur compounds
from liquid
fuels is oxidative desulfurization. Although several studies have
reported the enhancement effect of ultrasound irradiation on oxidative
desulfurization, the exact mechanism underlying this enhancement is
not known yet. In this study, we have addressed this issue with dual
approach of coupling experiments with mathematical model for cavitation.
Results of this study have given interesting revelation of interaction
between mechanism of ultrasound, cavitation, and oxidation system.
Isolation of cavitation phenomenon helps to increase the extent of
oxidation. This effect is attributed to formation of hydrogen and
carbon monoxide during transient collapse of cavitation bubbles due
to thermal dissociation of hexane vapor entrapped in the bubble, which
hamper the action of O species generated from the oxidation system.
Transient cavitation itself does not give rise to radical formation,
because of rather low temperature peaks reached during collapse. Therefore,
cavitation does not enhance the oxidation process, but in fact, has
an adverse effect on it. Current study has established that the beneficial
effect of ultrasound on oxidative desulfurization system is merely
of a physical nature (i.e., emulsification due to intense micromixing),
with no involvement of a sonochemical effect.