Detailed characterization of 2-heptanone conversion by dielectric barrier discharge in N(2) and N(2)/O(2) mixtures.
The products of 2-heptanone conversion by dielectric barrier discharge plasma are analyzed under different conditions: alternating current (ac) or pulsed mode of excitation, variable energy, variable composition of the carrier gas. The efficiency of the conversion is higher using a pulse excitation mode than an ac mode. With a small oxygen percentage (about 2-3%) added to nitrogen, 2-heptanone is about 30% more efficiently removed than in pure nitrogen, while the 2-heptanone removal decreases with an oxygen percentage higher than 3%. A new analysis method, based on chemical ionization mass spectrometry, is used for volatile organic compound detection along with chromatography. Several products issued from 2-heptanone conversion with ac excitation are identified in nitrogen and in air, and a chemical scheme is proposed to explain their formation and their treatment by the discharge. It appears that byproducts are issued not only from oxidation reactions, but also from C-C bond cleavage by collisions with electrons or nitrogen excited states.
Chiper
Alina Silvia
AS
Plasma Physics Department, Faculty of Physics, A1.l. Cuza University, Bd. Carol I, No. 11, 700506 Iasi, Romania.
Blin-Simiand
Nicole
N
Heninger
Michel
M
Mestdagh
Hélène
H
Boissel
Pierre
P
Jorand
François
F
Lemaire
Joël
J
Leprovost
Julien
J
Pasquiers
Stéphane
S
Popa
Gheorghe
G
Postel
Christian
C
D017097:Electric Impedance; D007659:Ketones / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*
D007659:Ketones; C011917:2-heptanone; D009584:Nitrogen; D010100:Oxygen