A comparative testing of flat and hollow fiber Nafion/PEEK-WC catalytic membranes in the partial oxidation of propane to oxygenates (n-propanol, isopropanol, propionic aldehyde and acetone) with Fe2+ -H2O2 Fenton system in a multifunctional three-phase reactor (3PCMR) under mild conditions (T-R, 70-120 degrees C P-R, 140kPa) has been accomplished. The features of the multifunctional 3PCMR that enables reaction along with product separation and recovery are discussed. The influence of the membrane geometry on selectivity and distribution of reaction products in gas and liquid phases is outlined. Hollow fiber systems ensure higher productivity per unit of reactor volume, higher selectivity to primary oxidation products (n-propanol and isopropanol) and a more effective product recovery. (c) 2006 Elsevier B.V. All rights reserved.