In the heterogeneous version of our homogeneous photocatalytic system using ZrCo-MOF, the catalyst achieves comparable activity and selectivity to the homogeneous system, while also displaying increased longevity, robustness, and recyclability. Incorporation of the cobaloxime catalyst as linkers of a MOF is indeed a valuable strategy to overcome the low structural stability of cobaloximes in homogeneous phase. Illumination for 4 hours of the ZrCo-MOF-based system produced 698 mmol C2H4 per gram of Co (Figure ), which is a factor of five higher than that our previous Co-PCN-222-based MOF system (142 mmol C2H4 per gram of Co). No C2H4 we speculate that the MOF-based system takes longer to achieve complete C2H2 conversion due to diffusional limitations and reduced access to the catalytic sites on the interior of the framework.