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- Title
Heterogeneous chemistry of monocarboxylic acids on α-Al<sub>2</sub>O<sub>3</sub> at ambient condition.
- Authors
Tong, S. R.; Wu, L. Y.; Ge, M. F.; Wang, W. G.; Pu, Z. F.
- Abstract
A study of the atmospheric heterogeneous reactions of formic acid, acetic acid, and propionic acid on dust particles (-α-Al2O3) was performed at ambient condition by using a diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) reactor. From the anα-Alysis of the spectrα-Al features, observations of carboxylates formation provide strong evidence for an efficient reactive uptake process. Comparison of the cα-Alculated and experimentα-Al vibrationα-Al frequencies of adsorbed carboxylates establishes the bridging coordinated structures on the surface. The uptake coefficients of formic acid, acetic acid, and propionic acid on -α-Al2O3 particles are (2.07±0.26)×10-3, (5.00±0.69)×10-3, and (3.04±0.63)×10-3, respectively (using geometric area). Besides, the effect of various relative humid (RH) on this heterogeneous reactions was studied. The uptake coefficients of monocarboxylic acids on α-α-Al2O3 particles increase initiα-Ally (RH<20%) and then decrease with the increased RH (RH>20%) which was due to the effect of water on carboxylic acids solvation, particles surface hydroxylation, and competition on reactive site. On the basis of the results of experimentα-Al simulation, the mechanism of heterogeneous reaction of dust with carboxylic acids at ambient condition was discussed. The loss of atmospheric monocarboxylic acids due to reactive uptake on available minerα-Al dust particles can be competitive with homogeneous loss pathways, especiα-Ally in dusty urban and desertified environments.
- Subjects
CARBOXYLIC acids; CHEMICAL reactions; FORMIC acid; PROPIONIC acid; ACETIC acid; FOURIER transform spectroscopy; ATMOSPHERIC chemistry
- Publication
Atmospheric Chemistry & Physics Discussions, 2010, Vol 10, Issue 2, p3937
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acpd-10-3937-2010