Agilent 7890 analysis of hydrogen, methane, carbon monoxide, carbon dioxide – order of peak appearance
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The Agilent 7890 is used to analyze hydrogen, methane, carbon monoxide, and carbon dioxide; the order of peak appearance is as such, and the hydrogen content in the product gas is 99%
For such a compositional analysis, it is recommended not to analyze hydrogen; instead, analyze the composition of the impurities and then calculate the hydrogen content using subtraction. If the levels of carbon monoxide and carbon dioxide are low, it is advisable to use a methanation converter paired with a FID detector, so that the composition of methane, carbon monoxide, and carbon dioxide can be analyzed with a single sample injection. The order of peak emergence is methane, carbon monoxide, and carbon dioxide; if nitrogen analysis is required, an additional TCD detector must be installed, along with appropriate adjustments to the chromatography column system.
What is the model of the chromatography column used by the poster?
Peak order CO CH4 CO2
First, it is necessary to know what kind of column is being used: an alumina-filled column, with TCD detection; the gases involved are hydrogen, nitrogen, carbon monoxide, methane, and CO2
The hydrogen content is too high while the levels of other components are too low; the sensitivity of TCD alone is insufficient, so it is recommended to use a nickel conversion furnace in combination with FID； Separate detection of hydrogen.
It is recommended that the original poster specify the conditions in more detail when asking questions; the order of peak emergence depends on many factors, such as the type of columns used, etc. The original poster can refer to ASTM D 1946, and Agilent also provides technical documentation at http://www.chem.agilent.com/cag/cabu/pdf/p7.pdf