Heterogeneous Chemistry of Organic Acids on Soot Surfaces

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• 作者：Nicholas P. Levitt ; Renyi Zhang ; Huaxin Xue ; Jianmin Chen
• 刊名：Journal of Physical Chemistry A
• 出版年：2007
• 出版时间：June 7, 2007
• 年：2007
• 卷：111
• 期：22
• 页码：4804 - 4814
• 全文大小：185K
• 年卷期：v.111,no.22(June 7, 2007)
• ISSN：1520-5215

文摘

We have investigated the heterogeneous interaction between a number of carboxylic acids and soot generatedfrom different fuel sources and formation mechanisms. A low-pressure fast flow reactor in conjunction withion drift-chemical ionization mass spectrometry detection was employed to study uptake of monocarboxylic(benzoic, oleic, and steric) and dicarboxylic (glutaric, maleic, oxalic, and phthalic) acids on deposited sootsurfaces formed by combustion of methane, propane, and kerosene. Most acids exhibited irreversible uptakeon the soot surfaces and the uptake coefficient was measured in the range of 9 × 10^-4 to 1 × 10^-1 estimatedbased on the geometric surface areas. Brunauer, Emmett, and Teller surface areas of the deposited soot surfaceswere measured and the soot bulk and surface chemical compositions were evaluated with Fourier transforminfrared spectroscopy and attenuated total reflection spectroscopy. Plausible uptake mechanisms were discussedon the basis of the measured soot physiochemical properties by comparing the mono and dicarboxylic acids.