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Seminar : Auto-oxidation of organic compounds: from combustion to atmospheric chemistry

2017-03-02

Title: Auto-oxidation of organic compounds: from combustion to atmospheric chemistry
 
Speaker: Dr. Zhandong Wang
King Abdullah University of Science and Technology Saudi Arabia
 
Date: 2 March, 2017 (Thursday)
 
Time: 3:00 p.m.
 
Venue: Room 7-37, Haking Wong Building, HKU
 
Abstract:
The auto-oxidation of organic compounds occurs in many natural and engineered systems. Gas-phase auto-oxidation of volatile organic compounds (VOC) in the atmosphere leads to the formation of secondary organic aerosol (SOA), which constitutes a major fraction of global burden
of atmospheric aerosol, known to greatly impact both climate and human health. In combustion systems, low-temperature auto-oxidation of hydrocarbon fuel leads to ignition, a governing parameter in the design of engines. In the liquid phase, auto-oxidation contributes to the degradation of organic substance such as lipids, lubricants, plastics, and food. The first part of this talk focuses on recent proposed novel cool flame chemistry of hydrocarbon auto-oxidation in combustion process. Experimental approaches of state-of-the-art synchrotron radiation photoionization time-of-flight mass spectrometry, atmospheric pressure chemical ionization-Orbitrap mass spectrometry, isotopic labelling, and H/D exchange reactions are utilized to confirm this novel cool flame chemistry. The second part of this talk focuses on the auto-oxidation of mono-terpenes and its surrogate initiated from ozonolysis and OH radical, which leads to large
amounts of highly oxidized molecules (HOM). HOM are recently known as a large source of low-volatile SOA.
 
Short Bio:
Dr. Zhandong Wang received his PhD from University of Science and Technology of China under the advisory of Prof. Fei Qi in 2014. He had two years post-doc experience before he got promoted to a research scientist at the King Abdullah University of Science and Technology. His research aims to understand the combustion process with use of state-of-the-art
diagnostics, detailed kinetic modeling, and quantum chemistry calculation, under the molecular level. His PhD thesis, which focused on the reaction kinetics of fuel pyrolysis and the reaction mechanism of PAHs, was awarded the Excellent PhD Dissertations by Chinese Academy of Sciences. He recently works on the auto-oxidation mechanism of hydrocarbons in combustion process and of volatile organic compounds (VOC) in atmospheric chemistry. He published more than 50 peer-reviewed journal papers and he served as reviewer of several international journals in the past few years. He was awarded the Bernard Lewis Fellowship by the Combustion Institute in the 35th International Symposium on Combustion in San Francisco and served as a Session Chair of the 36th International Symposium on Combustion in Seoul.
 
ALL INTERESTED ARE WELCOME
 
For further information, please contact Prof. D.Y.C. Leung at 3917 7911.