This paper presents a method for the quantification of gas streams from reactive systems using on-line gas chromatography. The method is based on the mathematical development of correlations between the quantities detected by a set comprised of a thermal conductivity detector, a methanizer, and a flame ionization detector. The method allows for a complete and physically meaningful quantification of the composition of gas streams.<br>
The accuracy
of the online quantification of gaseous effluents from catalytic reactors
by mass spectrometry (MS) is rarely addressed by researchers despite
the extensive use of the technique. MS results are strongly sensitive
to both the operation conditions of the reactor and to the state of
the instrument. Therefore, most studies use them as qualitative descriptors
of the performance of catalytic reaction systems. The purpose of this
work was to develop an accurate method for the quantification of gaseous
effluents from catalytic reactors. For this purpose, the mathematical
expressions from the so-called external and internal standard calibration
methods for MS were coupled to the typical metrics used for studying
catalytic reactions, namely, conversion, selectivity, and carbon mass
balances. The catalytic combustion of methane was selected as a model
reaction to test the developed approach. The accuracy of the developed
method was validated by comparison with results obtained in a separate
reaction system coupled online to a gas chromatograph. The closure
of the carbon mass balance was used as control metrics allowing for
the assessment of the physical meaning of the method. In general,
the internal standard method of calibration was found to be best for
the accurate quantification of gaseous streams by online mass spectrometry.
In general, the results of this investigation may be of use to researchers
in the field of catalysis as well as to research workers using mass
spectrometry for various purposes.
This paper presents a method for the quantification of gas streams from reactive systems using on-line gas chromatography. The method is based on the mathematical development of correlations between the quantities detected by a set comprised of a thermal conductivity detector, a methanizer, and a flame ionization detector. The method allows for a complete and physically meaningful quantification of the composition of gas streams.<br>
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