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题名: Heterogeneous Uptake of Gas-Phase Acetic Acid on the Surface of alpha-Al2O3 Particles: Temperature Effects
作者: Hou, Siqi1; Tong, Shengrui1; Zhang, Ying1; Tan, Fang1; Guo, Yucong1; Ge, Maofa1
关键词: adsorption ; aggregation ; heterogeneous reaction ; surface chemistry ; temperature effects
刊名: CHEMISTRY-AN ASIAN JOURNAL
发表日期: 2016-10-01
卷: 11, 期:19, 页:2749-2755
收录类别: SCI
英文摘要: Heterogeneous reactions are thought to play a significant role in the formation of haze, especially in wintertime, which suggests that temperature may affect the heterogeneous formation of organic aerosols. As the most-abundant carboxylic acid in the Earth's atmosphere, we chose acetic acid to study the effect of temperature on its heterogeneous reaction with alpha-Al2O3 between 248 and 298 K. The products were characterized by in situ DRIFTS, which indicated that lowering the temperature slowed the formation of acetate, but promoted the formation of crystalline acetic acid. Moreover, low temperatures promoted a different reaction mechanism to that at room temperature. Owing to the formation of chain structures at low temperatures, crystalline acetic acid molecules covered the surface active sites on alpha-Al2O3, thereby inhibiting the formation of acetate. However, crystalline acetic acid reacted with alpha-Al2O3 itself in a sequential manner. Furthermore, the reactive uptake coefficients, active energies, and acetic acid lifetimes at different temperatures were investigated.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35104
Appears in Collections:分子动态与稳态结构实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, BNLMS, State Key Lab Struct Chem Unstable & Stable Speci, Inst Chem, Beijing 100190, Peoples R China
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