Influence of the pore structure on the catalytic performance of Rh supported Zr MOFs in the hydroformylation of olefins Zirconium based metal organic frameworks (Zr MOFs) of different pore sizes and structure were synthesized and used for the preparation of the Rh supported catalysts. The catalytic performance was studied in the hydroformylation of olefins to the corresponding aldehydes. A series of n alk 1 enes of different chain length and bulky olefins with different size was used to study the influence of the pore size and structure. The results show that the Zr MOF based catalysts are very active and show high aldehyde selectivity.<eng>