北京大学学报（自然科学版）

NOx存在下异戊二烯与OH自由基大气化学反应

李爽,陈忠明,刘兆荣,邵可声,唐孝炎   

  1. 北京大学环境科学中心环境模拟与污染控制国家重点联合实验室，北京，100871
  • 收稿日期:1998-04-13 出版日期:1999-07-20 发布日期:1999-07-20

An Experimental Study for Atmospheric Chemistry of soprene with OH Radicals in the Presence of NOx

LI Shuang, CHEN Zhongming, LIU Zhaorong, SHAO Kesheng, TANG Xiaoyan   

  1. The State Key Laboratory of Environmental Simulation and Pollution Control, Center of Environmental Sciences, Peking University, Beijing, 100871
  • Received:1998-04-13 Online:1999-07-20 Published:1999-07-20

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摘要： 采用长光路傅立叶变换红外光谱(LP-FTIR)技术，研究NOx存在下异戊二烯与氢氧自由基(OH)的模拟大气化学反应。OH自由基由亚硝酸甲脂(CH３ONO)黑光灯光解产生。结果表明，产物中主要有羰基化合物、硝酸酯或过氧硝酸酯、甲酸(HCOOH)及CO等。鉴定出的羰基化合物为甲基丙烯醛(CH２=C(CH3)CHO)、甲基乙烯基酮(CH３Ｃ(O)CH=ＣＨ２)和甲醛(HCHO)。在298K、93.3kPa时，甲基丙烯醛和甲基乙烯基酮的产率分别为(20.8±1.5)%和(33.4±2.2)%。压力变化对这两种羰基化合物的产率几乎无影响。最后对NOx存在下的异戊二烯/OH自由基反应进行了简略讨论。

关键词: 异戊二烯, OH自由基, 大气化学反应

Abstract: The experimental simulation was employed to study the atmospheric chemistry of isoprene with OH radicals in the presence of NOx, using long-path Fourier transform infrared (LP-FTIR) method. OH radical was produced from photodissociation of CH3ONO under irradiation of black lights. Results showed that carbonyl compounds, organic nitrates, HCOOH and CO, were formed. Methacrolein (CH2=C(CH3)CHO), methyl vinyl ketone (CH3C(O)CH=CH2) and HCHO were identified. At the temperature of 298K and the pressure of 93.3kPa, yields of methacrolein and methyl vinyl ketone were (20.8±1.5)% and (33.4±2.2)% respectively. The pressure variation did not influence their yields. Finally the reaction of isoprene with OH radical in the presence of NOx was discussed briefly.

Key words: isoprene, OH radical, atmospheric chemical reaction

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