S10 and Table ). However, the dynamic properties of porous polymers and their ability to swell does not allow to draw a final conclusion about its porous state under solvated, catalytic conditions. In summary, we developed a novel heterogenized Xantphos macroligand, following a simple crosslinking approach. Molecular ruthenium species were immobilized on the porous network and the catalyst was evaluated in the aqueous CO2 hydrogenation to formic acid. Reference experiments reveal its heterogeneous nature and highlight the excellent activity. The investigation of its recyclability suggests an initial deactivation of the catalyst, leading to a minor decay of catalytic productivity after a certain induction period. This alteration can be presumably referred to changes of the topology of the porous system and the metal coordination sphere.