Remarkably fast low-temperature hydrogen storage into aromatic benzyltoluenes over MgO-supported Ru nanoparticles with homolytic and heterolytic H2 adsorption

Kim, Tae Wan; Kim, Minseok; Kim, Seok Ki; Choi, Yong Nam; Jung, Minji; Oh, Hyunchul; Suh, Young Woong

doi:10.1016/j.apcatb.2021.119889

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Remarkably fast low-temperature hydrogen storage into aromatic benzyltoluenes over MgO-supported Ru nanoparticles with homolytic and heterolytic H2 adsorption

Kim, Tae Wan;
Kim, Minseok;
Kim, Seok Ki;
Choi, Yong Nam;
Jung, Minji;
... Suh, Young Woong;
외 1명

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초록

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.

키워드

Heterolytic hydrogen adsorption; Hydrogen storage; Liquid organic hydrogen carrier; MgO; Supported Ru catalysts; Aromatization; Catalysts; Density functional theory; Gas adsorption; Hydrogenation; Magnesia; Oxide minerals; Ruthenium; Ruthenium compounds; Temperature; Basic surface; Catalytic performance; Control experiments; Hydrogen adsorption; Hydrogen carriers; Large amounts; Low temperatures; Ru nanoparticles; Hydrogen storage

제목: Remarkably fast low-temperature hydrogen storage into aromatic benzyltoluenes over MgO-supported Ru nanoparticles with homolytic and heterolytic H2 adsorption

저자: Kim, Tae Wan; Kim, Minseok; Kim, Seok Ki; Choi, Yong Nam; Jung, Minji; Oh, Hyunchul; Suh, Young Woong

DOI: 10.1016/j.apcatb.2021.119889

발행일: 2021-06

유형: Article

저널명: Applied Catalysis B: Environmental

권: 286

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