Temperature controlled three-stage catalytic dehydrogenation and cycle performance of perhydro-9-ethylcarbazole

Yang, Ming; Han, Chaoqun; Ni, Gang; Wu, Jingjie; Cheng, Hansong

doi:10.1016/j.ijhydene.2012.05.092

Cited by 82 publications

(41 citation statements)

References 19 publications

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“…The high heats of reaction and the high activation barriers of dehydrogenation with these LOHCs make the reactions to occur only at significantly elevated temperatures, potentially resulting in side reactions that could be detrimental to fuel cell devices [1,25e27]. In contrast, the LOHC based on N-ethylcarbazole enables nearly a full release of hydrogen under 200 C with virtually no side reaction [28,29]. Unfortunately, in spite of the fact that the perhydrogenated N-ethylcarbazole is a liquid, the fully dehydrogenated product is in a solid form below 70 C. This makes practical applications of the LOHC material inconvenient because of the poor compatibility with the existing energy infrastructure.…”

Section: Introductionmentioning

confidence: 99%

Catalytic hydrogenation and dehydrogenation of N-ethylindole as a new heteroaromatic liquid organic hydrogen carrier

Dong

Yang

et al. 2015

International Journal of Hydrogen Energy

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Section: Introductionmentioning

confidence: 99%

Catalytic hydrogenation and dehydrogenation of N-ethylindole as a new heteroaromatic liquid organic hydrogen carrier

Dong

Yang

et al. 2015

International Journal of Hydrogen Energy

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“…Yang et al investigated the temperature controlled stage-wise dehydrogenation of perhydro-N-ethylcarbazole and its cycle performance. They were able to produce high purity hydrogen (>99.9%), which no carbon monoxide and other gases toxic as byproduct [30].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen storage by N-ethylcarbazol as a new liquid organic hydrogen carrier: A DFT study on the mechanism

Mehranfar

Izadyar

Esmaeili

2015

International Journal of Hydrogen Energy

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“…5,8,10,[13][14][15] In these studies, it has been found that the reaction from H12-NEC to NEC proceeds stepwise over the main intermediates H8-NEC and H4-NEC. 16,17 The activation energy of the dehydrogenation reaction has been reported to be in the range of 118-127 kJ mol H 2 À1 .…”

Section: 8mentioning

confidence: 99%

Efficient hydrogen release from perhydro-N-ethylcarbazole using catalyst-coated metallic structures produced by selective electron beam melting

Peters

Eypasch

Frank

et al. 2015

Energy Environ. Sci.

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A particularly suitable reactor concept for the continuous dehydrogenation of perhydro-Nethylcarbazole in the context of hydrogen and energy storage applications is described. The concept addresses the fact that dehydrogenation is a highly endothermic gas evolution reaction.Thus, for efficient dehydrogenation a significant amount of reaction heat has to be provided to a reactor that is essentially full of gas. This particular challenge is addressed in our study by the use of a catalyst-coated (Pt on alumina), structured metal reactor obtained by selective electron beam melting. The so-obtained reactor was tested both as a single tube set-up and as a Hydrogen Release Unit (HRU) with ten parallel reactors. In stationary operation, the HRU realized a hydrogen release capacity of 1.75 kW therm (960 W el in a subsequent fuel cell) with up to 1.12 g H 2 min À1 g Pt À1and a power density of 4.32 kW el L À1 of HRU reactor. Broader contextThe conversion of our current energy system to a hydrogen-based one requires effective ways to store hydrogen in large amounts over long periods of time using existing infrastructures. Liquid Organic Hydrogen Carrier systems, such as e.g. perhydro-N-ethyl carbazole (H12-NEC)/N-ethyl carbazole (NEC), have the potential to substitute step-by-step liquid fossil fuels as they have attractive energy densities and diesel-like handling. Hydrogen release from H 2 -rich LOHC systems allows the on-demand utilization of regenerative energy equivalents at any time and at any place. However, the hydrogen release from H 2 -rich LOHC systems is challenging due to the endothermic nature of the dehydrogenation reaction combined with the large volume expansion of the reaction mixture. Our contribution shows that 3-D-structured metallic reactors produced via selective electron beam melting and coated with Pt on alumina represent very suitable and efficient dehydrogenation reactors for this catalytic dehydrogenation reaction. Using such reactors, we could demonstrate a power density of up to 4.32 kW el L À1in the dehydrogenation reaction (assuming a fuel cell efficiency of 55%). The system stability and reproducibility of the dehydrogenation results were found to be excellent over 48 h time-on-stream.

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Temperature controlled three-stage catalytic dehydrogenation and cycle performance of perhydro-9-ethylcarbazole

Cited by 82 publications

References 19 publications

Catalytic hydrogenation and dehydrogenation of N-ethylindole as a new heteroaromatic liquid organic hydrogen carrier

Catalytic hydrogenation and dehydrogenation of N-ethylindole as a new heteroaromatic liquid organic hydrogen carrier

Hydrogen storage by N-ethylcarbazol as a new liquid organic hydrogen carrier: A DFT study on the mechanism

Efficient hydrogen release from perhydro-N-ethylcarbazole using catalyst-coated metallic structures produced by selective electron beam melting

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