Hydrogen storage in liquid organic hydride: Selectivity of MCH dehydrogenation over monometallic and bimetallic Pt catalysts

AlHumaidan, Faisal S.; Tsakiris, Dimos E.; Cresswell, David L.; Garforth, Arthur

doi:10.1016/j.ijhydene.2013.08.067

Cited by 93 publications

(53 citation statements)

References 55 publications

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“…A side-reaction of MCH dehydrogenation, hydrodemethylation of toluene (as shown in eqn (2)), and coking on the catalyst are key difficulties to be overcome. [19][20][21][22] They lead to production of benzene and methane as by-products, thereby increasing the costs of hydrogen purication. 19 Furthermore, benzene is toxic for humans.…”

Section: Introductionmentioning

confidence: 99%

Low-temperature selective catalytic dehydrogenation of methylcyclohexane by surface protonics

et al. 2019

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The methylcyclohexane (MCH)-toluene cycle is a promising liquid organic hydride system as a hydrogen carrier. Generally, MCH dehydrogenation has been conducted over Pt-supported catalysts, for which it requires temperatures higher than 623 K because of its endothermic nature. For this study, an electric field was applied to Pt/TiO 2 catalyst to promote MCH dehydrogenation at low temperatures. Selective dehydrogenation was achieved with the electric field application exceeding thermodynamic equilibrium, even at 423 K. With the electric field, "inverse" kinetic isotope effect (KIE) was observed by accelerated proton collision with MCH on the Pt/TiO 2 catalyst. Moreover, Pt/TiO 2 catalyst showed no methane byproduction and less coke formation during MCH dehydrogenation. DRIFTS and XPS measurements revealed that electron donation from TiO 2 to Pt weakened the interaction between catalyst surface and p-coordination of toluene. Results show that the electric field facilitated MCH dehydrogenation without methane and coke by-production over Pt/TiO 2 catalyst. † Electronic supplementary information (ESI) available. See

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Section: Introductionmentioning

confidence: 99%

Low-temperature selective catalytic dehydrogenation of methylcyclohexane by surface protonics

et al. 2019

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“…Due to the high intrinsic hydrogenation/dehydrogenation activity, the conventional Pt-based catalysts are currently used for the methylcyclohexane dehydrogenation, such as Pt/Al 2 O 3 , Pt/V 2 O 5 , Pt/Y 2 O 3 and Pt-Re/Al 2 O 3 [8][9][10][11][12][13][14][15][16][17][18]. But the scarcity and the high cost of the noble metals prompted researchers to find alternatives, and thus, various transition metals have recently been tested in cycloalkanes dehydrogenation such as Ni, Cu, Sn [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Dehydrogenation of methylcyclohexane to toluene over partially reduced Mo–SiO2 catalysts

Boufaden

Akkari

Pawelec

et al. 2015

Applied Catalysis A: General

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“…According to the literature, typical dehydrogenation conditions characterised by low hydrogen pressure and high temperatures lead to catalyst deactivation by coking. [24][25][26] The same studies suggest that a slightly higher hydrogen partial pressure creates an equilibrium-like state at the active catalytic sites in which formation and removal of carbon take place at the same rate. Likewise, a higher back pressure in LOHC dehydrogenation is expected to lead to a lower reaction rate due to the fact that reversible hydrogen storage via LOHC hydrogenation/dehydrogenation is driven by pressure change.…”

Section: Results and Discussion Hot Pressure Swing Operation Over 40mentioning

confidence: 87%

“…[24][25][26] The same studies suggest that a slightly higher hydrogen partial pressure creates an equilibrium-like state at the active catalytic sites in which formation and removal of carbon take place at the same rate. [24][25][26] The same studies suggest that a slightly higher hydrogen partial pressure creates an equilibrium-like state at the active catalytic sites in which formation and removal of carbon take place at the same rate.…”

Section: Hot Pressure Swing Operation Over 405 Hoursmentioning

confidence: 87%

Operational Stability of a LOHC‐Based Hot Pressure Swing Reactor for Hydrogen Storage

et al. 2018

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Apart from hydrogen logistics, stationary hydrogen storage applications using Liquid Organic Hydrogen Carrier (LOHC) systems are also of significant interest. In contrast to the traditional use of separate hydrogenation and dehydrogenation reactors, our so‐called oneReactor technology offers the advantages of a simpler storage unit layout and high dynamics in switching from hydrogen charging to hydrogen release. Here we report repeated hydrogenation and dehydrogenation cycles with one batch of liquid carrier for LOHC stability tests under defined hydrogenation and dehydrogenation conditions. We demonstrate up to 13 hydrogenation/dehydrogenation cycles over a total of 405 h of operation including two long dehydrogenation sequences over weekends. In general, longer dehydrogenation runs, i. e. exposure of the LOHC to catalyst at low hydrogen pressure and elevated temperatures (>280 °C), showed negative effects on both activity of the subsequent cycles and by‐product formation. Concerning catalyst activity and hydrogen productivity, stable productivity was achieved (within 3 to 9 cycles) under all conditions tested. Longer hydrogenation runs led to significantly higher stability of the reaction system.

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Hydrogen storage in liquid organic hydride: Selectivity of MCH dehydrogenation over monometallic and bimetallic Pt catalysts

Cited by 93 publications

References 55 publications

Low-temperature selective catalytic dehydrogenation of methylcyclohexane by surface protonics

Low-temperature selective catalytic dehydrogenation of methylcyclohexane by surface protonics

Dehydrogenation of methylcyclohexane to toluene over partially reduced Mo–SiO2 catalysts

Operational Stability of a LOHC‐Based Hot Pressure Swing Reactor for Hydrogen Storage

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