Chlorobenzene pyrolysis at low pressure by in-situ
synchrotron radiation photoionization mass spectrometry

Abstract

Abstract: Chlorobenzene compounds and their high-temperature pyrolysis products are one kind of the important pollutants in the atmosphere. The research on the pyrolysis path of chlorobenzene can provide basic theoretical guidance for preventing or reducing the emission of related pollutants. The pyrolysis of chlorobenzene in a flow tube reactor was studied at 4 kPa and 873∼1373 K by in-situ synchrotron radiation photoionization mass spectrometry (SR-PIMS). 16 products including olefin, aromatic hydrocarbons, and chlorinated aromatic hydrocarbons were detected in real time. Mole fractions of these products were obtained as function of pyrolysis temperature. The results show that o-benzyne is a key intermediate for the formation of small molecules in the pyrolysis of chlorobenzene. Besides, compared with the pyrolysis results of chlorobenzene at atmospheric-pressure observed before in this group, it was found that low pressure can reduce the formation pathways of chlorine-containing organics such as chlorinated aromatic hydrocarbons, an important secondary pyrolysis product of chlorobenzene, which indicates that pressure conditions can affect the formation and the following atmospheric emission of chlorinated aromatic hydrocarbons.

Key words: chlorobenzene, flow reactor pyrolysis, synchrotron radiation photoionization mass spectrometry; intermediate

CLC Number:

O657.63

XU Minggao, WEN Wu, ZHAO Long, YANG Jiuzhong, ZHU Baozhong, SUN Yunnan, ∗, PAN Yang∗. Chlorobenzene pyrolysis at low pressure by in-situ synchrotron radiation photoionization mass spectrometry[J]. Journal of Atmospheric and Environmental Optics, 2022, 17(4): 442-452.

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Chlorobenzene pyrolysis at low pressure by in-situ synchrotron radiation photoionization mass spectrometry

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