Benzyltoluene/dibenzyltoluene-based mixtures as suitable liquid organic hydrogen carrier systems for low temperature applications

By H. Jorschick, M. Geißelbrecht, M. Eßl, P. Preuster, A. Bösmann, P. Wasserscheid. 2020

151 citations recorded by the source corpus.

Abstract In this contribution we propose mixtures of the two LOHC systems benzyltoluene (H0-BT)/perhydro benzyltoluene (H12-BT) and dibenzyltoluene (H0-DBT)/perhydro dibenzyltoluene (H18-DBT) as promising hydrogen storage media for technical applications at temperatures below ambient. The mixing of the two LOHC systems provides the advantage of a reduced viscosity of the hydrogen-rich system, for example a 20 wt% addition of H12-BT to H18-DBT reduces the viscosity at 10 °C by 80%. Interestingly, it is also found that the dehydrogenation of such mixture provides a hydrogen release productivity that is 12–16% higher compared to pure H18-DBT dehydrogenation under otherwise identical conditions. This enhanced rate is attributed to a combination of reduced hydrogen partial pressure in the reactor (due to the higher H12-BT vapor pressure), preferred H12-BT dehydrogenation (due to faster H12-BT diffusion) and effective transfer hydrogenation between the two LOHC systems.

Subfields: Catalysis, Energy Engineering and Power Technology, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/9a739468f5c597e300bf77eb08bac9cb21804bfb

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Citations in the corpus

• Potential Liquid-Organic Hydrogen Carrier (LOHC) Systems: A Review on Recent Progress (2020, background): “4 kJ/mol H2), but its low boiling point (270 ◦C) compared to H18-DBT (370 ◦C) limits the liquid-phase dehydrogenation temperature [63,82].”