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DC Corona Electric Discharges for Air Pollution Control, 2—Ionic Intermediates and Mechanisms of Hydrocarbon Processing
Author(s) -
Marotta Ester,
Callea Alessandro,
Ren Xianwen,
Rea Massimo,
Paradisi Cristina
Publication year - 2008
Publication title -
plasma processes and polymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 74
eISSN - 1612-8869
pISSN - 1612-8850
DOI - 10.1002/ppap.200700128
Subject(s) - corona discharge , ozone , analytical chemistry (journal) , ion , corona (planetary geology) , chemistry , ionic bonding , atmospheric pressure , mass spectrometry , ion wind , hydrocarbon , environmental chemistry , electrode , chromatography , organic chemistry , meteorology , physics , astrobiology , venus
A mechanistic study is reported on i ‐octane and hexane processing with +DC and −DC corona in air at room temperature and pressure. Current/voltage profiles are matched with the ion analysis data obtained by APCI mass spectrometry. With a −DC corona, the hydrocarbons do not modify the negative ion population with respect to uncontaminated air. In contrast, with a +DC corona many hydrocarbon‐derived positive ions form. O( 3 P) and • OH were also investigated using chemical probes (ozone formation and CO oxidation, respectively). The results, combined with efficiency and product data, suggest that with −DC corona radical initiation steps occur, whereas with +DC corona ionic reactions prevail.