Evaluation and Application of Dual-Reactor Chamber for Studying Atmospheric Oxidation Processes and Mechanisms
Evaluation and Application of Dual-Reactor Chamber for Studying Atmospheric Oxidation Processes and Mechanisms
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双反应室研究大气氧化过程和机理的评价及应用
DOI：
10.3866/pku.whxb201504161
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发表时间：
2015-07
期刊：
影响因子：
--
通讯作者：
Jia, L.
中科院分区：
文献类型：
--
作者：
Hou, S.Q.;Tong, S.R.;Mu, Y.J.;Jia, L.
设计并建造了一种新型双反应器雾霾室，用于研究可能形成臭氧或二次有机气溶胶（SOAs）的大气氧化过程。实验室由两个5 m(3)氟化乙丙烯（FEP）聚四氟乙烯薄膜反应器组成，其温度可控制在-10 ~ 40℃范围内，研究了光源对丙烯气相氧化机理的影响。结果表明，多紫外（UV）光源优于传统窄带黑灯光源。对丙烯和间二甲苯的光氧化工艺进行了初步实验。结果表明，双反应器室可以模拟臭氧或SOAs形成的气相氧化过程，并且可以通过比较不同初始浓度的实验来确定不同物种的影响。不同NOx条件下间二甲苯光氧化的SOA产率数据与前人的研究结果一致。这证明该实验室可以模拟气体到颗粒的转化过程。双反应器的优点是可以在只改变一个关键参数的情况下进行实验。这将有助于我们进一步了解复杂大气污染过程中关键因素的作用。
A new smog chamber with dual reactors was designed and constructed to study atmospheric oxidation processes that may form ozone or secondary organic aerosols (SOAs). The chamber consists of two 5 m(3) fluorinated ethylene propylene (FEP) Teflon-film reactors housed in a thermally isolated enclosure, in which the temperature can be well controlled in the range of -10 to 40 degrees C. The influence of the light source on the gas-phase oxidation mechanism of propene was investigated. The results showed that multiple ultraviolet (UV) light sources were better than traditional narrow-band black-lamp light sources. Preliminary experiments on propene and m-xylene photo-oxidation processes were performed. The results showed that the dual-reactor chamber can simulate the gas-phase oxidation processes that form ozone or SOAs, and can be used to determine the effects of various species by comparing experiments performed using different initial concentrations. The SOA yield data from m-xylene photo-oxidation under different NOx conditions were in good agreement with those from previous studies. This proves that the chamber can simulate gas-to-particle conversion processes. The dual reactors have the advantage of enabling experiments to be performed with only one key parameter being changed. This will help us to further understand the role of key factors in complex atmospheric pollution processes.