Chemistry Reference
In-Depth Information
6.6.2 E
XAMPLES
Beside others, the GC-MS setup has been applied to the chemical analysis of reaction
products formed in the dielectric barrier discharge operating at atmospheric pressure
[356] (see Section 3.8). Mixtures of CH
4
and CO
2
were converted partially into a large
number of substances. In Figure 6.37 the separation efficiency of the GC is illustrated.
The gas chromatogram shows the separated complex calibration mixture, necessary
for the quantitative determination of the expected reaction products. In Figure 6.38
CO
2
Signal
c/s
O
2
CH
4
N
2
C
2
H
6
C
3
H
8
C
4
H
10
i n
CH
4
CO
GS-Q
PLOT-5A
2
4
6
8
10
12
14
Time (min)
FIGURE 6.37
Analysis of a complex calibration mixture by the combined action of the
GS-Q and PLOT 5A column with the SHIMADZU GC-MS QP 5000 (comp. Figure 6.34);
sample mixture (
p
=
1 mbar,
V
=
1mL)ofCO
2
,O
2
,N
2
,CH
4
,CO(each5vol.%)andC
2
H
6
,
C
3
H
8
,
i
-C
4
H
10
,
n
-C
4
H
10
(each 100 ppm).
8×10
16
1000
8×10
15
100
C
2
H
6
C
2
H
4
C
2
H
2
C
3
H
8
8×10
14
10
n
-C
4
H
10
H
2
CO
CH
3
OH
ETO
8×10
13
1
8×10
12
0.1
A
B
C
D
E
F
Arrangement of the experiment
FIGURE 6.38
Comparison of the chemical efficiencies of the dielectric barrier discharge in
mixtures of CH
4
with CO
2
for different experimental conditions A-E for different operation
conditions of the discharge. (From Kozlov, K.V. et al.,
Plasma Polym.
, 5(3-4), 129, 2000.)
ETO: ethylene oxide.
