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Surface Functionalization of Metal-Organic Frameworks for Improved Moisture Resistance

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Heterogeneous Oxidation of Catechol.

Elizabeth A Pillar-Little¹, Ruixin Zhou¹, Marcelo I Guzman¹

¹Department of Chemistry, University of Kentucky , Lexington, Kentucky 40506, United States.

The Journal of Physical Chemistry. A

|September 26, 2015

Summary

This summary is machine-generated.

This study investigates the oxidation of catechol, a model compound for aromatic hydrocarbons in aerosols, under varying humidity. It reveals three key reaction pathways influencing secondary organic aerosol formation from biomass burning and combustion emissions.

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Area of Science:

Atmospheric Chemistry
Aerosol Science
Organic Geochemistry

Background:

Aromatic hydrocarbons from natural and anthropogenic sources are precursors to secondary organic aerosol (SOA).
Understanding the atmospheric fate of these compounds under humid conditions is crucial for aerosol research.
Catechol serves as a model for oxygenated aromatic hydrocarbons found in biomass burning and combustion aerosols.

Purpose of the Study:

To investigate the heterogeneous oxidation of catechol thin films by ozone (O3) at the air-solid interface.
To determine the influence of variable relative humidity (RH) on the oxidation pathways and products.
To elucidate the formation mechanisms of SOA precursors from aromatic compounds.

Main Methods:

Exposure of catechol thin films (approx. 104-μm thick) to ozone (O3) gas at varying mixing ratios (230 ppbv to 25 ppmv).
Controlled relative humidity conditions ranging from 0% to 90% RH.
Analysis of reaction products using electrospray ionization mass spectrometry (MS) and ion chromatography MS.

Main Results:

Maximum reactive uptake coefficient of O3 by catechol (γO3 = 7.49 × 10⁻⁶) observed at 90% RH.
Identified three primary oxidation pathways: C-C bond cleavage, Baeyer-Villiger oxidation, and indirect oxidation via hydroxyl radicals.
Formation of various organic acids (e.g., cis,cis-muconic, glyoxylic, oxalic) and polyhydroxylated aromatic compounds, including biphenyl and terphenyl derivatives.

Conclusions:

Ozone-initiated oxidation of catechol under humid conditions leads to diverse products, including SOA precursors.
The reaction pathways are influenced by relative humidity, affecting the composition of atmospheric aerosols.
This research provides insights into the transformation of aromatic hydrocarbons in the atmosphere, contributing to brown cloud formation.