Furthermore, the versatility and adaptability of our screening platform were underscored by seamlessly transitioning to alternative catalyst systems. For instance, a catalyst comprising ruthenium (oxide) nanoparticles supported on strontium titanate (STO, Ru/STO) exhibited varying selectivity in carbon monoxide production (approximately ranging between 40% and 70%), depending on the specific reaction conditions and duration of operation. Previous studies had reported high methane selectivity for a similar catalyst, suggesting that the observed variance could be attributed to the catalyst's exposure to distinct reaction environments. Conversely, another catalyst consisting of gold nanoparticles dispersed on titanium dioxide (Au/TiO2 3.1% w/w gold on anatase, with spheroidal gold particles averaging 1.70 nm in diameter, lognormal distribution) consistently yielded carbon monoxide as the primary product across all investigated conditions. This catalyst achieved productivities of up to 9.5 mmol gcat -1 h -1 , showcasing its robust performance under diverse reaction conditions. Precise automated control over the oil temperature, light intensity, and individual flow rates facilitated systematic condition screening, with selected results depicted in Figure . The irradiation of the reactor system notably enhanced carbon monoxide production when employing the Au/TiO2 catalyst. However, the flow rate exhibited a dual influence, with productivity and conversion showing a trade-off relationship, likely attributable to decreased residence time at higher throughputs. Furthermore, the reaction temperature emerged as a critical determinant of both conversion and productivity. Particularly noteworthy is the observation that significant carbon monoxide production only occurred at temperatures exceeding 160 °C, underscoring the necessity for thermal heating or robust light sources to supply the requisite thermal energy for catalyst-driven reactions. This parametric screening process furnishes invaluable insights into optimizing reaction conditions to meet predefined criteria, thereby enabling on-demand production of carbon monoxide or methane from carbon dioxide.