Steam reforming of iso-octane toward hydrogen production over mono- and bi-metallic Cu-Co/CeO sub(2) catalysts: Structure-activity correlations

tau he feasibility of tailoring the iso-octane steam reforming activity of Cu/CeO sub(2) catalysts through the use of Co as a second active metal (Cu sub(20-x)Co sub(x), where x = 0, 5, 10, 15, 20 wt%), is investigated. Characterization studies, involving N sub(2) adsorption-desorption at -196 degree C (BET), X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS) and Temperature Programmed Reduction (H sub(2)-TPR), were carried out to reveal the impact of the morphological, structural and surface properties of the catalysts on the reforming performance. The results showed that reforming activity was monotonically increased upon increasing cobalt loading. The Co/CeO sub(2) catalyst demonstrated the optimum performance with a H sub(2) yield of 70-80% in the 600-800 degree C temperature interval. The Co/CeO sub(2) catalyst exhibited also excellent stability at temperatures above 700 degree C, while Cu-based catalysts rapidly deactivated in long term stability tests. A close correlation between surface/redox properties and steam reforming efficiency was established. The lower reducibility of Co/CeO sub(2) catalysts, associated with the formation of Co super(3+) species, in Co sub(3)O sub(4)-like phase, can be accounted for the enhanced carbon tolerance of Co-based catalysts. Furthermore, the high concentration of surface oxygen species on Co/CeO sub(2) catalysts can be considered for their enhanced performance. On the other hand, the Cu-induced easier reducibility of bimetallic catalysts, in conjunction with carbon deposition and active phase sintering can be accounted for their inferior steam reforming performance. Irreversible changes in the redox properties of Cu-based catalysts, taking place under reaction conditions, could be resulted to ceria deactivation thus hindering the redox process to keep on.