The kinetics of oxidation of Diesel soots and a carbon black (Printex U) by O2 with reference to changes in both size and internal structure of the spherules during burnout
File(s)
Accepted version
Author(s)
Tighe, CJ
Twigg, MV
Hayhurst, AN
Dennis, JS
Type
Journal Article
Abstract
The rates of oxidation of two soots, produced from burning either ultra low sulphur Diesel or biodiesel in an engine, were measured at 450–550 °C, with oxygen concentrations of 2.7–24.4 vol%; Printex U was also studied. These carbons were first heated in argon to remove any volatile material; the resulting particles were found to burn in two stages. An initial, fast, transient reaction consumed almost 20% of the carbon in a soot particle. The rates of oxidation, during the second part of burnout were consistent with a model assuming these soots are comprised of porous spherules, which burn throughout their interiors. The overall rates in this second stage of burning were half-order with respect to O2, with an apparent activation energy of 145 ± 8 kJ mol−1. For the two Diesel soots, [CO2] and [CO] in the off-gases decreased, whilst the carbon burned, but the rate of oxidation of Printex U increased to a second maximum. This was consistent with the spherules in this carbon having pores, which grew and intersected, whilst the carbon was consumed. Thus the interiors of spherules of both Diesel soots and Printex U must have been accessible to O2, whilst they burned.
Date Issued
2016-10-01
Date Acceptance
2016-04-29
Citation
Carbon, 2016, 107 (1), pp.20-35
ISSN
0008-6223
Publisher
Elsevier
Start Page
20
End Page
35
Journal / Book Title
Carbon
Volume
107
Issue
1
Copyright Statement
© 2016 Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Identifier
https://www.sciencedirect.com/science/article/pii/S0008622316303463
Subjects
Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Materials Science, Multidisciplinary
Chemistry
Materials Science
FLUID-SOLID REACTIONS
RANDOM PORE MODEL
PARTICULATE-EMISSIONS
ARRHENIUS PARAMETERS
OXYGEN
REACTIVITY
COMBUSTION
Nanoscience & Nanotechnology
02 Physical Sciences
03 Chemical Sciences
09 Engineering
Publication Status
Published
Date Publish Online
2016-05-10