Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/43340
Title: Impact of intake hydrogen enrichment on morphology, structure and oxidation reactivity of diesel particulate
Authors: Zhou, JH
Cheung, CS 
Zhao, WZ
Ning, Z
Leung, CW 
Keywords: Diesel particulate
Hydrogen
Microstructure
Morphology
Oxidation reactivity
Issue Date: 2015
Publisher: Pergamon Press
Source: Applied energy, 2015, v. 160, p. 442-455 How to cite?
Journal: Applied energy 
Abstract: Experimental investigations were conducted on a 4-cylinder natural-aspirated direct-injection diesel engine with naturally aspirated hydrogen, focusing on the effects of hydrogen addition on the physico-chemical properties of the diesel particulate. Diesel particulates were sampled for off-line analysis, with the aid of TEM and TGA facilities. Hydrogen addition promotes particle oxidation at low engine load and speed due to the increase of exhaust temperature, resulting in smaller particles, but it inhibits particle oxidation at high engine load due to the competition of oxygen between hydrogen and diesel fuel which results in larger primary particles. The replacement of injected diesel fuel by hydrogen inhibits the formation of soot nuclei and decreases its volume density, hence reduces the size of aggregate particles which are more spherical as indicated by an increase of fractal dimension and a decrease of radius of gyration. With increase of engine load, primary particles exhibit more graphitic structure, changing from "onion like" to "shell-core" structure. Hydrogen addition promotes and inhibits primary particle oxidation at low and high engine loads, respectively, and the corresponding primary particles are "turbostratic interlayer" and "shell-amorphous" in structure, respectively. The results of recognized fringe length, tortuosity and fringe separation distance are consistent with the observed morphology. The oxidation reactivity is related to equivalence ratio, being higher at low engine load and speed, which is indicated by the variation of activation energy and ignition temperature. The oxidation reactivity is validated to be related to the nanostructure of primary particles.
URI: http://hdl.handle.net/10397/43340
ISSN: 0306-2619
EISSN: 1872-9118
DOI: 10.1016/j.apenergy.2015.09.036
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

7
Last Week
0
Last month
Citations as of Nov 6, 2018

WEB OF SCIENCETM
Citations

7
Last Week
0
Last month
Citations as of Nov 7, 2018

Page view(s)

58
Last Week
2
Last month
Citations as of Nov 11, 2018

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.