Abstract
Alumina supported mono and bimetallic catalysts based on platinum and ruthenium were studied for the conversion of n-heptane at 400 and 500°C. The combustion of the 0.1 to 0.3 wt % of resulting carbonaceous deposits was followed by means of thermal programmed oxidation (TPO), that is by simultaneous quadrupole analysis of the oxygen consumption and the carbon dioxide evolution. No significant variation of the molecular ratio of oxygen consumed to carbon dioxide evolved was observed, either with the temperature during a single TPO experiment or with the ruthenium to platinum atomic ratio in the catalyst. On the other hand, the lowest temperature necessary to complete the combustion of the carbonaceous deposits was found to be much smaller for the ruthenium monometallic catalyst than for the platinum mono or platinum - ruthenium bimetallic catalysts.
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