Combined dynamic operation of PEM fuel cell and continuous dehydrogenation of perhydro-dibenzyltoluene

Geiling, Johannes; Steinberger, Michael; Ortner, Florian; Seyfried, Roman; Nuß, Andreas; Uhrig, Felix; Lange, Christopher; Öchsner, Richard; Wasserscheid, Peter; März, Martin; Preuster, Patrick

doi:10.1016/j.ijhydene.2021.08.034

Cited by 27 publications

(11 citation statements)

References 45 publications

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“…For this purpose, a 22 mL Parr reactor was loaded with 1 mL of formic acid and 14 mg of 1 (0.05 mol %) and then heated at 90 °C in an oil bath. We were pleased to record a pressure increase up to 42 bar, sufficient to supply a flow of hydrogen to PEM-fuel cell …”

Section: Resultsmentioning

confidence: 99%

“…We were pleased to record a pressure increase up to 42 bar, sufficient to supply a flow of hydrogen to PEM-fuel cell. 29 To complete the study on FA dehydrogenation, the latent (sometimes quoted dormant) behavior of complex 1 was evaluated. To our knowledge, this feature, or property, has not been reported in the domain of formic acid dehydrogenation.…”

Section: ■ Introductionmentioning

confidence: 99%

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Base-Free Reversible Hydrogen Storage Using a Tethered π-Coordinated-Phenoxy Ruthenium-Dimer Precatalyst

et al. 2023

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A dimeric tethered π-coordinated-phenoxy ruthenium precatalyst has been used for the base-free hydrogenation of CO 2 in DMSO. The same precatalyst was also efficient in the reverse dehydrogenation of formic acid yet under base-free conditions. An unprecedented base-free cycle consisting in hydrogen storage and release was successfully implemented with the same precatalyst. The latent property of the catalyst has been introduced in the concept of hydrogen storage/transportation/release.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Base-Free Reversible Hydrogen Storage Using a Tethered π-Coordinated-Phenoxy Ruthenium-Dimer Precatalyst

et al. 2023

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“…There have been several studies focused on reactor designs to optimally perform the dehydrogenation reaction. − The primary objectives have been ensuring good heat transfer characteristics to power the highly endothermic reaction and managing the complex hydrodynamics as a result of the evolution of large volumes of hydrogen gas. Most literature investigations have focused on horizontal fixed-bed reactors, where evolved hydrogen moves perpendicular to the liquid flow and exits via the headspace. , They benefit from decoupling the liquid hourly space velocity (LHSV) from the gas evolution rate and do not have issues with flooding.…”

Section: Lohc Powertrain: Technical Designmentioning

confidence: 99%

“…26,49−51 Several studies consider shell and tube reactors with exhaust on the tube side, 26,51 but the reverse configuration is also possible. 27 Similar designs are viable for trucking applications, but they require some adaptation. Engine systems are sensitive to pressure drops in the exhaust loop, because the exhaust flow powers the turbochargers, and loss of boost pressure reduces the power output.…”

Section: Combustion Enginesmentioning

confidence: 99%

Perspective on Decarbonizing Long-Haul Trucks Using Onboard Dehydrogenation of Liquid Organic Hydrogen Carriers

2023

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Decarbonization of long-haul trucks, which are the backbone of global supply chains, is necessary to meet climate goals. Currently, battery electric and conventional hydrogen powertrains are not cost-competitive solutions against diesel. Liquid Organic Hydrogen Carriers (LOHCs) are a promising fuel option that benefits from synergies with existing retail fuel distribution infrastructure, providing a cost-effective way to transport hydrogen energy. LOHCs are now used to deliver hydrogen gas to refueling stations, where it is then compressed and used to fuel trucks. However, this approach incurs ∼50% energy loss from the endothermic dehydrogenation and compression of hydrogen. We discuss an alternative concept based on onboard hydrogen release to address these pain points. We highlight recent advances in dehydrogenation reactor design, catalyst technologies, and hydrogen combustion engines that are relevant to the proposed system. Deficiencies in current technologies are discussed, along with potential research directions to address them. Initial analysis shows that the LOHC option, charged with blue hydrogen, achieves rough cost parity with diesel. The estimated well-to-wheel greenhouse gas emissions for this option are approximately one-third of diesel. Based on our analysis, LOHC-powered trucks featuring onboard dehydrogenation are a promising option to decarbonize long-haul trucking. However, making this option a reality will require dedicated study and development of core components for the power-dense, efficient, and robust onboard release of hydrogen from LOHCs along with efficient heat integration between the engine and the dehydrogenation reactor.

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“…[17] However, the study points out that for effective hydrogen transport via LOHC systems, waste heat integration should be considered to provide the required heat of dehydrogenation. Note that the technical dehydrogenation of methylcyclohexane to toluene and of H18-DBT to H0-DBT is typically operated at temperature levels of 350-400 °C [18][19][20][21] and 300-340 °C, [22][23][24] respectively. Lowering the dehydrogenation temperature reduces heat losses and enables easier integration of industrial waste heat sources.…”

mentioning

confidence: 99%

Performance of Continuous Hydrogen Production from Perhydro Benzyltoluene by Catalytic Distillation and Heat Integration Concepts with a Fuel Cell

Rüde

Anschütz

et al. 2023

Energy Tech

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The benzyltoluene‐based liquid organic hydrogen carrier (LOHC) system enables the safe transport and loss‐free storage of hydrogen. At least 26% of the lower heating value of the released hydrogen, however, has to be invested in form of heat to release the stored hydrogen. The low operation temperatures of catalytic distillation (CD) can facilitate waste heat integration to reduce external heat demand. Herein, the continuous hydrogen release from perhydro benzyltoluene via CD is demonstrated. It is revealed in the experimental results that this mode of operation leads to a high hydrogen release rate and very efficient noble metal catalyst usage at exceptionally mild conditions. The hydrogen‐based productivity of platinum of 0.35 gH2 gPt−1 min−1 (0.7 kWLHV_H2 gPt−1) at a dehydrogenation temperature of only 267 °C is found to be nearly four times higher than for the conventional continuous liquid‐phase dehydrogenation at the same temperature. Furthermore, simulation results of the CD process are described. The feasibility of a fully heat‐integrated process for electricity generation from the released hydrogen via CD using waste heat from the fuel cell for the CD reboiler is demonstrated. The technical potential of coupling the H12–BT dehydrogenation by CD with high‐temperature fuel cell operation is highlighted by the simulation.

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Combined dynamic operation of PEM fuel cell and continuous dehydrogenation of perhydro-dibenzyltoluene

Cited by 27 publications

References 45 publications

Base-Free Reversible Hydrogen Storage Using a Tethered π-Coordinated-Phenoxy Ruthenium-Dimer Precatalyst

Base-Free Reversible Hydrogen Storage Using a Tethered π-Coordinated-Phenoxy Ruthenium-Dimer Precatalyst

Perspective on Decarbonizing Long-Haul Trucks Using Onboard Dehydrogenation of Liquid Organic Hydrogen Carriers

Performance of Continuous Hydrogen Production from Perhydro Benzyltoluene by Catalytic Distillation and Heat Integration Concepts with a Fuel Cell

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