Dehydrogenation Of Decalin Under A Multi-phase Reaction Condition

Because of the global environmental and energy problem, hydrogen is getting more and more attention as a promising alternative fuel for automobile in the future. Although the R&D of the onboard fuel cell and the hydrogen internal-combustion engine have made great progresses in technology, a high efficient, safe and economical onboard hydrogen resource is in urgent need. In this paper, we studied the dehydrogenation process of decalin on the "wet-dry multiphase" reaction condition.From the aspect of dynamic energy balance, this paper studied the multiphase dehydrogenation of decalin catalyzed by Raney-Ni in small glass equipment. The influences of reaction temperature (483K-573K), the amounts of reactant (0.2mL-4.0mL) and catalyst (2g-10g) on the conversion were investigated. During the reaction, the evolved gases were constantly separated through condenser from the system and collected in the 400ml measuring cylinder. The research indicate that there be a optimal point for the system energy balance, so the reactant can touch the catalyst surface efficiently, and the vaporized after dehydrogenation reaction to avoid reverse reaction. So the conversion of decalin increased efficiently. Under the reaction conditions of 653K, 1.5mL decalin and 12g Raney-Ni, the dehydrogenation conversion was up to 92.3%.The influences of reaction temperature (483K-573K), the amounts of reactant (0.2mL-4.0mL) and catalyst (2g-10g) on the apparent rate constant were investigated. The results showed that high reaction temperature, low initial feeding amounts and high amount of catalyst can gained high apparent rate constant. The apparent activation energy of the cyclohexane, methylcyclohexane and decalin dehydrogenation reaction were 37.01KJ/mol,64.33KJ/mol and 58.99KJ/molo...