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Characterization of Alkane Oxidation Products in a Corona-Discharge Reactor Using Ammonia-Doped Ion Mobility–Mass Spectrometry
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DOI：10.1021/jasms.6c00175.png)
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Abstract
En 中文
This study examines the oxidation of C5–C8 alkanes in an external corona-discharge reactor. Oxidation products were characterized using ion mobility spectrometry (IMS) and tandem IMS–mass spectrometry (IMS-MS) with an internal corona-discharge APCI source. This configuration enables structural isomer resolution and provides deeper insight into the molecular composition of the oxidation products. IMS-MS analysis showed that alkane (M) oxidation produces mainly ketones ([M+O–2H]) and diketones ([M+2O–4H]), with 3-ketone isomers dominating. Under standard APCI conditions, H+(H2O)n reactant ions protonated these products, generating complex IMS spectra for [M+O-2H].H+ and [M+2O-4H].H+. Introducing NH3 as a dopant shifted the primary reactant ion to NH4+(H2O)n, forming [M+O–2H]. NH4+ and [M+2O–4H].NH4+ adducts with similar collision cross sections. This simplified the IMS spectra to a single peak, enhanced sensitivity, and improved suitability for analytical applications. Using this approach, quantitative analysis of selected alkanes yielded detection limits of 0.01–0.1 ppmv.
Keywords:
Hydrocarbons
Ionization
Ions
Oxidation
Reaction products
saturated hydrocarbons
ammonia dopant
corona discharge
alkane oxidation
ion mobility spectrometry
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2.7
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7.1K
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1.1W
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Cited Papers