Boosting the activity of hydrogen release from liquid organic hydrogen carrier systems by sulfur-additives to Pt on alumina catalysts

Auer, Franziska; Blaumeiser, Dominik; Bauer, Tanja; Bösmann, Andreas; Szesni, Normen; Libuda, Jörg; Wasserscheid, Peter

doi:10.1039/c9cy00817a

Cited by 96 publications

(57 citation statements)

References 39 publications

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“…Therefore, it is desirable to develop more selective catalysts that can suppress side reactions. Auer et al [44] found that sulfur coating of the low-coordination sites of Pt particles on Pt/Al 2 O 3 can suppress the side reactions. They also believe that the turnover rate of the reaction is improved as a result of the enhanced desorption of the dehydrogenation product, DBT, due to the change in the electronic state of Pt caused by the sulfur modification.…”

Section: Recent Reports On the Catalytic Dehydrogenation Of 18h-dibenzyltoluenementioning

confidence: 99%

Recent Trends on the Dehydrogenation Catalysis of Liquid Organic Hydrogen Carrier (LOHC): A Review

2021

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Considering the expansion of the use of renewable energy in the future, the technology to store and transport hydrogen will be important. Hydrogen is gaseous at an ambient condition, diffuses easily, and its energy density is low. So liquid organic hydrogen carriers (LOHCs) have been proposed as a way to store hydrogen in high density. LOHC can store, transport, and use hydrogen at high density by hydrogenation and dehydrogenation cycles. In this review, we will focus on typical LOHCs, methylcyclohexane (MCH), 18H-dibenzyltoluene (DBT), and 12H-N-ethylcarbazole (NECZ), and summarize recent developments in dehydrogenation catalytic processes, which are key in this cycle.

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Section: Recent Reports On the Catalytic Dehydrogenation Of 18h-dibenzyltoluenementioning

confidence: 99%

Recent Trends on the Dehydrogenation Catalysis of Liquid Organic Hydrogen Carrier (LOHC): A Review

2021

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“…The carrier is porous Al 2 O 3 , while the shell consists of the active component platinum. The catalyst was tuned with sulfur due to improved activity and reduced side product formation [19]. For the experiments, the microstructure was filled with particles of the fraction of 200-300 µm without dilution; thereby a total catalyst mass of 1.51 g was integrated.…”

Section: Reactormentioning

confidence: 99%

Hydrogen Production from the LOHC Perhydro-Dibenzyl-Toluene and Purification Using a 5 µm PdAg-Membrane in a Coupled Microstructured System

Wunsch¹,

Berg²,

Pfeifer³

2020

Materials

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Hydrogen bound in organic liquid hydrogen carriers (LOHC) such as dibenzyl-toluene enables simple and safe handling as well as long-term storage. This idea is particularly interesting in the context of the energy transition, where hydrogen is considered a key energy carrier. The LOHC technology serves as a storage between volatile energy and locally and timely independent consumption. Depending on the type of application, decisive specifications are placed on the hydrogen purity. In the product gas from dehydrogenation, however, concentrations of 100 to a few 1000 ppm can be found from low boiling substances, which partly originate from the production of the LOHC material, but also from the decomposition and evaporation of the LOHC molecules in the course of the enormous volume expansion due to hydrogen release. For the removal of undesired traces in the LOHC material, a pre-treatment and storage under protective gas is necessary. For purification, the use of Pd-based membranes might be useful, which makes these steps less important or even redundant. Heat supply and phase contacting of the liquid LOHC and catalyst is also crucial for the process. Within the contribution, the first results from a coupled microstructured system—consisting of a radial flow reactor unit and membrane separation unit—are shown. In a first step, the 5 µm thick PdAg-membrane was characterized and a high Sieverts exponent of 0.9 was determined, indicating adsorption/desorption driven permeation. It can be demonstrated that hydrogen is first released with high catalyst-related productivity in the reactor system and afterwards separated and purified. Within the framework of limited analytics, we found that by using a Pd-based membrane, a quality of 5.0 (99.999% purity) or higher can be achieved. Furthermore, it was found that after only 8 hours, the membrane can lose up to 30% of its performance when exposed to the slightly contaminated product gas from the dehydrogenation process. However, the separation efficiency can almost completely be restored by the treatment with pure hydrogen.

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“…19 For fuel applications, especially in the maritime sector, efficient release of hydrogen from the carrier is required so a lot of research is being put into the development of new catalysts for this reaction. [128][129][130][131][132][133] Toluene and methylcyclohexane however, have quite a low flashpoint, and this implies fire hazards when using this molecule in bulk as a hydrogen carrier medium. Furthermore, even though it is still present in present day fuels, the aromatic contents have been restricted in fuels due to the proven carcinogenic nature of small aromatic molecules.…”

Section: Aromatic Liquid Organic Hydrogen Carriersmentioning

confidence: 99%

Challenges in the use of hydrogen for maritime applications

Hoecke

Laffineur

Campe

et al. 2021

Energy Environ. Sci.

204

107

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Boosting the activity of hydrogen release from liquid organic hydrogen carrier systems by sulfur-additives to Pt on alumina catalysts

Abstract: Liquid organic hydrogen carriers represent an interesting alternative for hydrogen storage and transport. We demonstrate a method to simultaneously increase the activity of LOHC dehydrogenation catalysts and reduce side product formation.

Cited by 96 publications

References 39 publications

Recent Trends on the Dehydrogenation Catalysis of Liquid Organic Hydrogen Carrier (LOHC): A Review

Recent Trends on the Dehydrogenation Catalysis of Liquid Organic Hydrogen Carrier (LOHC): A Review

Hydrogen Production from the LOHC Perhydro-Dibenzyl-Toluene and Purification Using a 5 µm PdAg-Membrane in a Coupled Microstructured System

Challenges in the use of hydrogen for maritime applications

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