7-ethylindole: A new efficient liquid organic hydrogen carrier with fast kinetics

Autor: Ting Zhu, Zhenlin Zhang, Xuedi Chen, Zhiwen Chen, Zhenjie Liu, Guoe Cheng, Hansong Cheng, Yuan Dong, Ming Yang
Rok vydání: 2018
Předmět:
Zdroj: International Journal of Hydrogen Energy. 43:12688-12696
ISSN: 0360-3199
DOI: 10.1016/j.ijhydene.2018.03.088
Popis: We report a discovery of a new member of the liquid organic hydrogen carrier (LOHC) family, 7-ethylindole (7-EID), with a low melting point of −14 °C and a decent hydrogen content of 5.23 wt%. Hydrogenation of the compound was carried out over a commercial 5 wt% Ru/Al2O3 catalyst in the H2 pressure range of 5–8 MPa and a temperature range of 120–160 °C, respectively. It was found that the hydrogenation rate positively correlates with the reaction temperature. However, the rate was barely effected by the H2 pressure if the pressure exceeds 6 MPa. The estimated apparent activation energy of 7-EID hydrogenation is 51.5 kJ/mol. The fully hydrogenated product, octahydro-7-ethylindole (8H-7-EID), was used as the reactant for the dehydrogenation reaction at 170–200 °C over a 5 wt% Pd/Al2O3 catalyst. Full dehydrogenation of 8H-7-EID to 7-EID can be achieved within 270 min at 190 °C. The apparent activation energy of 8H-7-EID dehydrogenation was calculated to be 101.9 kJ/mol at 170–200 °C. The liberated H2 was found to be of high purity, which meets the requirement of proton exchange membrane fuel cells.
Databáze: OpenAIRE
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