Abstract
Dehydrogenation of methylcyclohexane has been studied over a platinum monometallic catalyst supported on α-Al 2O 3. Physical and chemical properties of platinum crystallites were studied by TPR and TPD/H 2 techniques. The hydrogen desorption profile was found to be particle size dependent. A tightly-bonded hydrogen fixed on platinum particles after high-temperature reduction was revealed by TPD/H 2. In the methylcyclohexane dehydrogenation, it was found that the reactivity of platinum crystallites is related to the activation process performed before the catalytic test. The dehydrogenation rate increased by at least a factor of 2.0 when a desorption following high-temperature reduction was performed. These results were consistent with the hydrogen desorption profiles observed by TPD/H 2.
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