In this thesis, the enzymatic reduction of carbon dioxide (CO2) into formic acid, conducted by enzyme formate dehydrogenase (FDH), was investigated. In order to have a profitable implementation, some issues need to be solved. First of all, it is necessary to recover the enzyme at the end of the reaction, separating it from the products, with simple and cost-effective operations. Then, oxidoreductases need cofactors as electron donors, in this case NADH, which have to be regenerated to work in continuous. The solutions studied in this work are the employment of glycerol dehydrogenase (GlyDH) as cofactor restoring agent, and hierarchical zeolites as immobilization carriers.