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Activation and concentration polarization effects in anode-supported solid oxide fuel cells (SOFC) were examined. The anode and the cathode consisted respectively of porous, composite, contiguous mixtures of Ni+yttria-stabilized zirconia (YSZ) and Sr-doped LaMnO 3 (LSM)+YSZ. The composite electrode provides parallel paths for oxygen ions (through YSZ), electrons (through the electronic conductor;...
The thermal cracking of PR Spring bitumen-derived heavy oils in the presence of hydrogen was studied in a fixed-bed reactor as a function of process operating variables. The reactor was filled with a catalytically inert sodium exchanged alumina. The packing consisted of an alumina hydrodenitrogenation catalyst support which had been impregnated with 2 wt.% sodium to reduce the acidity of the alumina...
PR Spring bitumen was hydrotreated in a fixed-bed reactor over a commercial Mo/alumina hydrodemetallation (HDM) catalyst. Hydrodenitrogenation (HDN), hydrodesulfurization (HDS), hydrodemetallation, Conradson carbon residue (CCR) reduction, and residuum conversion were studied as a function of process operating conditions (T = 625-685 K, WHSV = 0.26-1.55 h -1 and reactor pressure = 11...
The hydrotreatment of PR Spring bitumen-derived heavy oils was achieved in a fixed-bed reactor over presulfided commercial NiMo/alumina hydrodenitrogenation catalysts. The extends of heteroatom and metal removal and of Conradson carbon residue (CCR) and residuum (> 811 K) conversion were determined as a function of process operating variables: temperature (625-685 K) and liquid hourly space velocity...
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