Abstract
The production of hydrogen, through steam reforming of ethanol at low temperature has been the subject of several studies over the last decade. In the present study, the catalytic performance of 0.5% Pt/γ-Al2O3 catalyst has been investigated in the temperature range of 300-450 0C with emphasis on its short-term stability. Reaction temperature was found to have a strong impact on the stability of the catalyst, as rapid deactivation was observed at temperatures above 400 0C. Coke formation was identified as the main cause of deactivation. Transient as well as steady state experiments with ethanol/H2O and CH3CHO/H2O mixtures showed that the reactions of acetaldehyde (which is an intermediate product of ethanol reforming) on the metal/carrier interface (especially cracking of acetaldehyde) play a crucial role in the deactivation of Pt/Al2O3 catalyst through coking. The modification of the Al2O3 support with Ca (3 wt%) led to a catalyst with decreased surface area and lower acidity that was found to be rather stable for 19 h time on stream under acetaldehyde steam reforming conditions.
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