Remarkably fast low-temperature hydrogen storage into aromatic benzyltoluenes over MgO-supported Ru nanoparticles with homolytic and heterolytic H2 adsorption
- Authors
- Kim, Tae Wan; Kim, Minseok; Kim, Seok Ki; Choi, Yong Nam; Jung, Minji; Oh, Hyunchul; Suh, Young Woong
- Issue Date
- Jun-2021
- Publisher
- Elsevier B.V.
- Keywords
- Heterolytic hydrogen adsorption; Hydrogen storage; Liquid organic hydrogen carrier; MgO; Supported Ru catalysts
- Citation
- Applied Catalysis B: Environmental, v.286, pp.1 - 13
- Indexed
- SCIE
SCOPUS
- Journal Title
- Applied Catalysis B: Environmental
- Volume
- 286
- Start Page
- 1
- End Page
- 13
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/1115
- DOI
- 10.1016/j.apcatb.2021.119889
- ISSN
- 0926-3373
- Abstract
- Hydrogen storage into aromatic compounds under mild conditions is a stringent issue in liquid organic hydrogen carrier (LOHC) systems. Herein, we report a highly active Ru/MgO catalyst in the hydrogenation of monobenzyltoluene and dibenzyltoluene at low temperatures. When MgO with basic surface oxygen was employed as a support, Ru/MgO showed a faster H2 storage rate and superior kinetic parameters than the other supported Ru catalysts. The better catalytic performance of Ru/MgO was explained by the results of characterization and control experiments. Ru/MgO could adsorb the large amounts of monobenzyltoluene and hydrogen with higher strength. Particularly, homolytic and heterolytic hydrogen adsorption modes were identified in Ru/MgO, unlike Ru/Al2O3 showing homolytic H2 adsorption. Density functional theory calculations confirmed heterolytic H2 dissociation near the Ru-MgO interface, which assured the hydrogenation efficiency of Ru/MgO. Consequently, Ru/MgO is highly recommended for fast hydrogen storage into aromatic LOHC compounds at low temperatures.
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