A novel concept is presented for the immobilization of a homogeneous catalyst. A hydroformylation catalyst was covalently anchored to monoliths that were constructed as the blades of a mechanical stirrer and used in a batch process. The catalyst was effective in the hydroformylation of both higher and lower alkenes and showed a high regioselectivity for the linear aldehyde. The concept was proven to be useful in a liquid organic and aqueous phase as well as in the gas phase and the catalyst could be used numerous times without catalyst deterioration. No catalyst deactivation was observed in a period over half a year.