2005 Volume 30 Issue 2 Pages 52-57
The dehydrogenation of decalin to naphthalene has been investigated on Pt/C, Pt/Al2O3 and Pt/Al(OH)O catalysts to examine the effect of support and liquid-film conditions under reactive distillation conditions. The maximum conversion of decalin on Pt/C, which did not repel decalin, was observed at 483K under the conditions of 0.3g of the catalyst and 1ml of decalin, which were corresponded to the liquid-film conditions. The liquid-film conditions have been generally defined as the specific ratio of the catalyst weight and decalin volume at a reaction temperature greater than boiling point of decalin. However such a maximum was not observed on Pt/Al2O3 and Pt/Al(OH)O, which repelled decalin. Furthermore it was found that the reaction temperature, at which the maximum hydrogen evolution was observed, shifted from the boiling point of decalin to that of naphthalene with increasing the amount of naphthalene in the reaction solution, indicating that the control of the reaction temperature should be important factor to obtain the liquid film conditions.
