The concept of using a post-column catalytic reactor to enhance the response of the FID was described by Porter & Volman,[REF] for the reduction of carbon dioxide and carbon monoxide to methane using a nickel catalyst.
The use of two reactors in series for the subsequent combustion and then reduction of organic molecules is described by Watanabe's group[REF][REF] and Dauenhauer's group[REF] using separate reactors for oxidation and reduction.