| Author: | Zhu, Hanbing |
| Title: | Gas products from the isoprene + nitrate radicals (NO₃) reaction and isoprene + ozone (O₃) reaction by using chamber |
| Advisors: | Lee, Shuncheng (CEE) |
| Degree: | M.Sc. |
| Year: | 2018 |
| Subject: | Hong Kong Polytechnic University -- Dissertations Air -- Pollution Atmospheric chemistry Isoprene |
| Department: | Faculty of Construction and Environment |
| Pages: | 34 pages : color illustrations |
| Language: | English |
| Abstract: | Atmospheric aerosols have an important influence on climate change, atmospheric visibility, global radiation balance and human health. Isoprene is the most abundant non-methane volatile organic compound (VOC) in the world. It can react with nitrate radicals (NO₃) and ozone (O₃) and the reaction produces oxygen-containing volatile organic compounds (OVOCs) which contribute the formation of aerosols. A series of experiments were carried out in a smog chamber in the Hong Kong Polytechnic University (PolyU). The products are the C1-C4 compounds mainly from the reaction of isoprene with O₃ and the primarily OVOCs detected are CH₂O, CH₂O₂, C₃H₆O, C₂H₄O₂ and C₄H₆O, C₃H₆O₂ and C₄H₆O₂. The C₅H₆O is one of the products of isoprene+NO₃ reaction. Furthermore, controlling NO₂ concentration and relative humidity can estimate their impacts on the formation of OVOCs. Except for formaldehyde, the higher the concentration of NO₂ is, the lower OVOCs yield is and the total yields of the OVOCs are 23.26%, 21.53% and 17.89% when the NO₂ concentration are 30ppb, 50ppb and 220ppb, respectively. In addition to CH₂O and CH₂O₂, when the relative humidity is 10% , 25% and 45%, the higher the relative humidity is, the higher yield of OVOCs is and the total yields of C₃H₆O, C2H₄O₂, C₄H₆O, C₃H₆O₂ and C₄H₆O₂ are 19.81%, 30.48%, 36.18% and 32.47% when the relative humidity are 10%, 25%, 45%, and 65%, respectively. On the contrary, the higher the relative humidity is, the yield of CH₂O detected is lower because of the solubility. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 991022244145603411.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 2.59 MB | Adobe PDF | View/Open |
Copyright Undertaking
As a bona fide Library user, I declare that:
- I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
- I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
- I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.
Please use this identifier to cite or link to this item:
https://theses.lib.polyu.edu.hk/handle/200/10060