Upgrading of oil sand bitumen was examined using a catalyst consisting of CeO2-ZrO2-Al2O3-FeOx and sub- and super-critical water in two reactor types: batch-type and fixed-bed flow-type. Bitumen diluted with benzene was used as a feedstock, and the effects of reaction pressure and temperature on product yield were investigated. Under conditions of high pressure (approximately 19 MPa), catalytic decomposition of bitumen proceeded effectively over the FeOX-based catalyst, with the yield of lighter components such as gas oil and vacuum gas oil (VGO) reaching 70 mol%-C at a reaction temperature of 693 K. Moreover, because coke formation on the catalyst was suppressed (less than 10 mol%-C under optimized reaction pressure and temperature), the FeOX-based catalyst showed excellent durability and reusability for catalytic decomposition of bitumen. (C) 2016 Elsevier B.V. All rights reserved.