期刊
PROCEEDINGS OF THE COMBUSTION INSTITUTE
卷 33, 期 -, 页码 533-540出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.proci.2010.06.164
关键词
Soot; Premixed flame; Chemical composition; Particle size distribution; FT-IR
资金
- National Aeronautics and Space Administration [NNG06GE89G]
- Strategic Environmental Research and Developmental Program
- National Science Foundation [CBET 0651990]
- DOE's Office of Biological and Environmental Research
- US Department of Energy by Battelle Memorial Institute [DE-AC06-76RL0 1830]
Chemical composition of nascent soot in burner-stabilized, premixed ethylene-oxygen-argon flames was studied using micro-FT-IR spectroscopy. The flames have an identical unburned gas composition with equivalence ratio equal to 2.07, but they differ in cold gas velocity. Nascent soot was sampled using a dilution probe over a range of burner surface-to-probe separation. The particles were deposited on thin-film substrates in a cascade impactor at two cut sizes of D-50 = 10 and 56 nm. The micro-FT-IR spectra revealed the presence of aliphatic C-H, aromatic C-H and a number of oxygenated functionalities. Spectral analyses were made to quantify variations of the aliphatic and aromatic C-H groups with flame temperature and sampling position. Results show that the aliphatic-to-aromatic C-H ratio is greater than unity in all cases, indicating the presence of an appreciable amount of aliphatic C-H bonds in nascent soot. The relative content of aliphatic components was found to increase with an increase in the maximum flame temperature. To examine the nature of these aliphatic constituents, a thermal desorption-chemical ionization time-of-flight mass spectrometry was used to softly fragment a soot sample and ionize the fragments. Results suggest that the aliphatic constituents are alkylated aromatics with molecular weights spanning from 200 to 900 amu. This work provides definitive and quantitative observations that aliphatics are abundant at early stages of soot mass and size growth. (C) 2010 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据