The rising concentrations of greenhouse gases, with carbon dioxide as a notorious example, in our atmosphere have propelled sustainable processing and carbon capture and utilization (CCU) to the forefront of both academic and industrial research efforts. Tackling the carbon footprint challenge necessitates a collaborative endeavor across various disciplines. Chemistry and chemical engineering, guided by the principles of green chemistry, take on a pivotal role in advancing this overarching goal. This entails a fundamental shift away from conventional fossil fuel-based methodologies towards sustainable alternatives, exemplified by the emergence of photochemical processes and circular chemistry practices. These approaches leverage milder conditions and, where feasible, harness solar energy as a green and renewable driving force for reactions. Integrating solar-powered or -assisted techniques with continuous-flow technologies offers enhanced control, scalability, selectivity, as well as superior mass and heat transfer capabilities to processes. Although carbon dioxide represents an ideal C1 building block, its inert nature has limited widespread application in synthetic organic chemistry. Arguably, a more promising approach involves converting CO2 into diverse C1 building blocks like methane or carbon monoxide. Particularly, carbon monoxide serves as an activated C1 building block with abundant associated chemistry. Reduction of CO2 can be achieved through hydrogenation reactions, such as the Sabatier reaction and reverse water gas shift (RWGS) reaction. These reactions have also been investigated as light-assisted processes in photochemical or photothermal systems, thereby lowering energy consumption and enhancing sustainability. To date, significant strides have been made in the development and evaluation of catalysts and reactor systems for the hydrogenation of carbon dioxide. However, direct comparison of the performance and efficacy of these catalysts remains challenging due to the absence of standardized operational procedures. In this endeavor, we aim to tackle these challenges by introducing an automated, integrated, and modular reactor system. The automation is facilitated by a custom-built, open-source code, accessible for use in any facility worldwide. While standardization methodologies have been effectively employed in batch processes for high-throughput screening and continuous-flow liquid systems, their application to light-assisted gas-phase reactions over heterogeneous catalysts remains relatively unexplored in this context. To bridge this gap, we present a standardized reactor system equipped with automated control over crucial parameters such as temperature, light intensity, pressure, residence time, and reagent stoichiometry, enabling the execution of gas-phase chemistry in a robust and reproducible manner. The precise control and modularity of this system facilitate the continuous light-assisted production of carbon dioxide hydrogenation products, which can be seamlessly integrated into downstream units. In this study, we leverage the generated carbon monoxide as a reagent in a diverse array of palladium-catalyzed carbonylative cross-coupling reactions, demonstrating the versatility and utility of our approach.