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- Posts: 1
- Joined: Tue Jan 29, 2019 10:33 am
I am running a Fischer-Tropsch synthesis and something is wrong with the methane peak from the TCD. The light gases are analyzed using a HP 6890 gas chromatograph. H2, N2 (internal standard), CO, CH4 and CO2 are analyzed on TCD using a Carbosieve column. Hydrocarbons products were separated with a GS-Alumina PLOT column and detected with a flame ionization detector (FID). CH4 was used to combine TCD and FID analysis. The synthesis gas contained 3% N2 which served as an internal standard for quantification of the products to close the mass balance.
So the methane peak is very low and unstable. All the other gases H2, N2, CO, CO2 seems to be as they should be. The methane peak in FID is fine, but since I need the area from TCD to calculate the methane selectivity and C5+ I need to solve this problem, any ideas?
Best,
ljubezr