We are performing electrocatalytic CO2 reduction experiments and are unable to measure the low quantities of CO that we are producing. This may be due to a large excess of CO2 (20 mL/min) that we are flowing through the cell.
We are using Soprane GC machine with Molecular sieve 5A, 10 m long column.
Dipak Shinde Molecular Sieves %A column is only useful for elution of O2,N2,CH4 and CO when connected to TCD detector .Note That CO2 could not be detected using the same column. The detection limit of your detector needs to be validated first possibly by passing lowest concentration of products that you may form i.e CO gas.Secondly if your detector is sensitive enough to detect the concentration then injector volume,split ratio of injector can be changed to obtain desired peak for CO. Lastly the CO2 electro-reduction i.e. CO2 conversion could be very less which gives lower concentrations of CO which can be improved by process optimization. Find attached document which can help you to develop method for elution of CO and other permanent gases.
You can refer to my colleagues' work: Defect Engineering in Polymeric Cobalt Phthalocyanine Networks for Enhanced Electrochemical CO2 Reduction
CO2 gas was introduced at ca. 20 ml min-1 using the mass flow controller (S48 300/HMT). The applied potentials were veried from -0.33 to -0.68 V. The generated gas bubbles were directly transferred into the gas sampling loop of a gas chromatograph (Agilent 7890B) for analysis (Figure S21, 22). Reduction products were analyzed by a thermal conductivity detector for the H2 concentration and then studied by a flame ionization detector with a methanizer for CO. The concentration of gaseous products was quantified by the integral area ratio of the reduction products to standards. Here we adopt the single standard gas data (Figure S20) to quantify the test gas, repeat our experiments at least for three times, and take the average data to do the further calculations.
The paper is open access.
Article Defect Engineering in Polymeric Cobalt Phthalocyanine Networ...
https://www.researchgate.net/post/Dear_gas_chromatography_experts_how_can_one_measure_low_quantities_of_CO_in_presence_of_a_large_excess_of_CO2?isAnswerFieldFocused=true
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