The concept of using a post-column catalytic reactor to enhance the response of the FID was described by Kenneth Porter & D.H. Volman, for the reduction of carbon dioxide and carbon monoxide to methane using a nickel catalyst. This process was later refined by Johns & Thompson, and is now commonplace in many laboratories, colloquially referred to as a methanizer. This device is limited to the conversion of carbon dioxide and carbon monoxide to methane, and the nickel catalysts are poisoned by species such as sulfur and ethylene. 
The use of two reactors in series for the subsequent combustion and then reduction of organic molecules is described by Takuro Watanabes group  and Paul Dauenhauers group using separate reactors for oxidation and reduction. The authors demonstrate the effectiveness of this technique in qualifying traceable standards and the analysis of mixtures without calibrations. 
The PolyArc reactor combines the combustion and reduction zones into a single microreactor using proprietary catalyst blends that efficiently convert organic molecules to methane.