Abstract
Oxidative carbon dioxide reforming of methane to synthesis gas over alumina-supported Ni catalysts was investigated at atmospheric pressure. The reforming reactions were carried out using a CO 2 to CH 4 feed ratio of one and reaction temperatures in the range 600–800 °C. The activity and stability of the catalyst, carbon deposition, and synthesis gas (H 2/CO) ratio were determined. Catalyst deactivation was primarily due to coke formation. energy dispersive spectroscopy (EDS), scanning electron microscopy (SEM) and thermo-gravimetric/differential analyzer (TG/DTA) techniques were used to confirm carbon deposition. It was observed that increasing the oxygen feed concentration and/or reaction temperatures, enhanced methane conversion and reduced coke formation. When 20% O 2 feed was used at 800 °C, catalyst stability test revealed a 99.7% CH 4 conversion, 1.0% CH 4 conversion drop and 1% carbon formation.
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