Comparison of catalytic performance of supported ruthenium and rhodium for hydrogenation of 9-ethylcarbazole for hydrogen storage applications
作者： Katarzyna Morawa Eblagon , Kin Tam , Shik Chi Edman Tsang
DOI: 10.1039/C2EE22066K
关键词: Hydride 、 Rhodium 、 Ruthenium 、 Hydrogen storage 、 Chemistry 、 Catalysis 、 Reaction intermediate 、 Hydrogen 、 Photochemistry 、 Inorganic chemistry 、 Dehydrogenation
摘要: The stepwise hydrogenation of 9-ethylcarbazole to 9-ethyl-perhydrocarbazole (Pl 12[H]) via partially hydrogenated intermediate(s) was studied over a number supported ruthenium and rhodium catalysts. reaction pathways were modelled the rate constants for individual steps compared. It found that selectivities intermediates products highly dependent on electronic structure particular metal nature support used. Ruthenium be most active this but it suffered from poor selectivity desired product due formation kinetically stable intermediate, 9-ethyl-octahydrocarbazole 8[H]) in short time. On other hand, catalysts with moderate activity gave higher fully under comparable conditions. also presence hydrophilic such as alumina or rutile can give favoured cis-isomers 9-ethyl-perhydrocarbazole. Regarding application reversible hydrogen storage concept, material should able switch between loaded unloaded forms during (material regeneration) dehydrogenation (delivery gas) times. Formation any stereo-non-favoured isomers type catalyst result significant implications overall capacity well operation times gas delivery regeneration. Thus, study yields valuable information suitability various use systems based liquid organic hydride (LOH) concept.
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