シクロヘキサン、ビシクロヘキシル及びデカリン誘導体の脱水素反応を利用したスプレーパルスリアクターによる燃料電池用水素供給

抄録

Highly efficient production of hydrogen without CO₂ emission is achieved in the dehydrogenation of cyclic hydrocarbons under a non-steady spray pulse operation. Cyclohexane, methylcyclohexane, cis-decahydronaphthalene trans-decahydronaphthalene, cyclohexylbenzene, and bicyclohexyl were efficiently dehydrogenated by the Pt catalysts supported on active carbon. The rates of dehydrogenation were in the following order: cyclohexylbenzene > cyclohexane, methylcyclohexane, bicyclohexyl > cis-decahydronaphthalene, 1-methyldecahydronaphthalene > trans-decahydronaphthalene. Comparing the reactants, the highest reaction rate was observed for cyclohexylbenzene. Additionally, both in the lower temperature region (220 – 280°C) and the higher temperature region (280 – 400°C), the lowest activation energy was observed for cyclohexylbenzene (Activation energy was 63 and 29 kJ mol^-1 for 220 – 280°C and 280 – 400°C, respectively). The highest hydrogen production rate was observed for bicyclohexyl, due to its high hydrogen contents in a molecule. Comparing the cis-decalin and trans-decalin, cis- isomer showed higher reaction rate than trans- isomer, reflecting the difference of free energy (ΔG) between the product (naphthalene) and the reactants.