Abstract
Liquid organic hydrogen carrier (LOHC) is considered as a promising candidate for large-scale hydrogen storage. In this work, we found that Pt/TiO2 catalysts exhibited better catalytic activity and selectivity compared to Pd/TiO2 and commercial Pd/Al2O3 catalysts in the dehydrogenation of dodecahydro-N-ethylcarbazole (12H-NECZ) at 453 K. The catalytic activity of the noble metal catalysts followed the trend of Pt/TiO2 > Pd/TiO2 > Rh/TiO2 > Au/TiO2 > Ru/TiO2. Compared with the commercial Pd/Al2O3, Pt/TiO2 greatly improved the selectivity and conversion rate, the reaction time was also shortened. In addition, kinetics calculation was carried out to obtain fundamental reaction parameters. It was found that the third step of 4H-NECZ dehydrogenation to NECZ was the rate-limiting step of the entire dehydrogenation reaction for all catalysts.
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