Tropospheric Aqueous-Phase Oxidation of Isoprene-Derived Dihydroxycarbonyl Compounds.

Tropospheric Aqueous-Phase Oxidation of Isoprene-Derived Dihydroxycarbonyl Compounds.
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异戊二烯衍生的二羟基羰基化合物的对流层水相氧化

DOI:
10.1021/acs.jpca.7b05879
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发表时间:
--
期刊:
The journal of physical chemistry. A
影响因子:
--
通讯作者:
Herrmann
Herrmann
中科院分区:
--
文献类型:
--
作者:
Stieger;Mettke;Herrmann

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在低NO条件下,由异戊二烯氧化产物在大气气相中形成的二羟基羰基3,4-二羟基-2-丁酮(DHBO)和2,3-二羟基-2-甲基丙醛(DHMP)可以预期在对流层水相中形成aqSOA,因为它们的溶解度。在本研究中,DHBO和DHMP的自由基驱动的水相氧化反应动力学进行了研究。对于DHBO和DHMP,报告了298 K下的以下速率常数:k(OH + DHBO)=(1.0 ± 0.1)× 109 L mol-1 s-1,k(NO3+ DHBO)=(2.6 ± 1.6)× 106 L mol-1 s-1,k(SO 4-+ DHBO)=(2.3 ± 0.2)× 107 L mol-1 s-1,k(OH + DHMP)=(1.2 ± 0.1)× 109 L mol-1 s-1,k(NO3+ DHMP)=(7.9 ± 0.7)× 106 L mol-1 s-1,k(SO 4-+ DHMP)=(3.3 ± 0.2)× 107 L mol-1 s-1,并给出了它们各自的温度依赖性。DHBO和DHMP的产物研究均揭示了羟基二羰基化合物、短链羰基化合物和羧酸(如羟基丙酮、甲基乙二醛、乳酸和甘草酸)作为氧化产物,单一产率高达25%。达到的碳平衡是75%的DHBO和67%的DHMP。DHBO和DHMP的水相氧化方案的基础上开发的实验结果,以显示其潜在的aqSOA的形成作出贡献。可以预期的是,对aqSOA的主要贡献是通过酸的形成而发生的,而其他短链氧化产物预计将返回分配到气相中以在那里进行进一步的氧化。
The dihydroxycarbonyls 3,4-dihydroxy-2-butanone (DHBO) and 2,3-dihydroxy-2-methylpropanal (DHMP) formed from isoprene oxidation products in the atmospheric gas phase under low-NO conditions can be expected to form aqSOA in the tropospheric aqueous phase because of their solubility. In the present study, DHBO and DHMP were investigated concerning their radical-driven aqueous-phase oxidation reaction kinetics. For DHBO and DHMP the following rate constants at 298 K are reported:k(OH + DHBO) = (1.0 ± 0.1) × 109L mol–1s–1,k(NO3+ DHBO) = (2.6 ± 1.6) × 106L mol–1s–1,k(SO4–+ DHBO) = (2.3 ± 0.2) × 107L mol–1s–1,k(OH + DHMP) = (1.2 ± 0.1) × 109L mol–1s–1, k (NO3+ DHMP) = (7.9 ± 0.7) × 106L mol–1s–1,k(SO4–+ DHMP) = (3.3 ± 0.2) × 107L mol–1s–1, together with their respective temperature dependences. The product studies of both DHBO and DHMP revealed hydroxydicarbonyls, short chain carbonyls, and carboxylic acids, such as hydroxyacetone, methylglyoxal, and lactic and pyruvic acid as oxidation products with single yields up to 25%. The achieved carbon balance was 75% for DHBO and 67% for DHMP. An aqueous-phase oxidation scheme for both DHBO and DHMP was developed on the basis of the experimental findings to show their potential to contribute to the aqSOA formation. It can be expected that the main contribution to aqSOA occurs via acid formation while other short-chain oxidation products are expected to back-partition into the gas phase to undergo further oxidation there.
DOI: 10.1039/c3cp54859g
发表时间: 2014-03
期刊: Physical chemistry chemical physics : PCCP
影响因子: --
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影响因子: 3.3
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影响因子: 6.3
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无 NOx 条件下异戊二烯 OH 引发氧化反应生成异丁烯醛和甲基乙烯基酮的产率与温度的关系
DOI: 10.1016/j.atmosenv.2013.06.032
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