Efficient hydrogen generation from organic chemical hydrides by using catalytic reactor on the basis of superheated liquid-film concept

Saito, Yasukazu; Aramaki, Kiyoshi; Hodoshima, Shinya; Saito, Morihiro; Shono, Atsushi; Kuwano, Jun; Otake, Katsuto

doi:10.1016/j.ces.2007.11.036

Cited by 37 publications

(12 citation statements)

References 7 publications

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“…To avoid problems of storage and transport, on-board efficient H 2 production technologies are drawing more and more attention [1][2][3][4][5]. The dehydrogenation of cyclic hydrocarbons with high hydrogen content, known also as "chemical hydrides" or "organic hydrides" is a promising method for storing and transporting hydrogen [4,[6][7][8]. Moreover, the idea to use fuels like diesel or kerosene cuts as a H 2 source is attracting increasing interest [9,10], with the goal to further upgrade an already valuable energy carrier (the fossil fuel) by extracting another energy carrier (H 2 ).…”

Section: Introductionmentioning

confidence: 99%

On-board H2 generation by catalytic dehydrogenation of hydrocarbon mixtures or fuels

et al. 2011

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The partial dehydrogenation (PDh) of hydrocarbon blends may be a suitable way to produce H2 on-board of automotives or airplanes to feed fuel cells and produce electric power, avoiding storage problems. In this work very interesting data have been collected using Jet A-1 surrogate and Pt–Sn/γ-Al2O3 catalysts, operating at 450 °C and feeding the vaporised hydrocarbon blend without any carrier gas. The use of Pt/Sn catalyst with 1:1 (w/w) ratio leads to the best compromise between activity and stability with time-on-stream, due to the formation of Pt-rich alloys. Nevertheless, all studied catalysts exhibited limited thio-tolerance. In optimized reaction conditions, H2 productivity of 3000 NL/kgcat/h, sufficient to produce 3 kW of electric power, considering purification steps and a fuel efficiency of 50%, was obtained

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Section: Introductionmentioning

confidence: 99%

On-board H2 generation by catalytic dehydrogenation of hydrocarbon mixtures or fuels

et al. 2011

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“…The design and development of compact reactors for highly endothermic MCH dehydrogenation [6] would help recover vehicle exhaust heats. Because SOFC exhaust heats are sufficient to release hydrogen from MCH with respect to temperatures and amounts, electric and thermal cogeneration owing to MCH-driven SOFC would renew greenhouse agriculture in rural (SATOYAMA, i.e., countryside farm near mountain) areas.…”

Section: Benefits and Future Visionmentioning

confidence: 99%

“…With regard to exergy loss during storage and release processes for standard-state hydrogen, 3.05 MJ/kg H 2 of thermal energy is lost owing to methylcyclohexane (MCH) dehydrogenation, which can be supplied within the temperature ranges of exhaust heats (e.g., 400 C). In contrast, liquefaction of gaseous hydrogen and compression up to 70 MPa must consume mechanical energies >42 and 22.1 MJ/kg H 2 , respectively [2].…”

Section: Introductionmentioning

confidence: 98%

Topic: Organic Hydride for Hydrogen Energy Carrier

Saito¹,

Okada²

2016

Energy Technology Roadmaps of Japan

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Hydrogen storage and transportation are critically important to realize a low-carbon society. A hydrogen supply chain concept has recently been proposed by Chiyoda Corporation on the successful basis of catalytic methylcyclohexane dehydrogenation, coupled with well-established toluene hydrogenation and existing delivery infrastructures at low cost. The SPERA Hydrogen™ process ensures liquid storage of hydrogen energy for safe large-scale and long-distance transportation (even abroad) under ambient temperature and atmospheric pressure. Overall costs would generate business risks. High-equilibrium temperatures and large enthalpy change (ΔH ) are deficit in this reversible reaction couple. Utilization of various types of exhaust heat and development of a compact-size dehydrogenation reactor should be explored.

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“…Properly-wetted nano-metal catalysts, supported on highly-porous activated carbon, had been chosen for efficient dehydrogenation [7][8][9][10]. Reasons of choice would be summarized as follows.…”

Section: Necessary Conditions For Properly-wetted Catalysismentioning

confidence: 99%

Dehydrogenation Catalyst for Organic Hydride on the Basis of Superheated Liquid-Film Concept

Shono¹,

Otake²,

Kobayashi

et al. 2016

J. Technol. Innov. Renew. Energy

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Reversible reaction couples of hydrogenation and dehydrogenation of organic compounds e.g. methylcyclohexane and toluene, or 2-propanol and acetone, are described in terms of hydrogen supplier to fuel cells, which will satisfy our demands of combined heat and power at various compact sizes. Carbon supported nano-sized metal particles, wetted with the liquid substrate in a reactor, was used for conversion of organic hydrides into hydrogen and organic compounds, being separable by distillation. Vigorous nucleate boiling is important for heat transfer as well as for irreversible bubble evolution, leading hydrogen to the vapor phase. Once the bubble is broken at the interface, catalytic hydrogenation will be prohibited, because gaseous hydrogen is unable to dissolve into the boiling liquid. Catalytic dehydrogenation under superheated liquid-film conditions can thus convert low-quality heats into hydrogen energy.

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Efficient hydrogen generation from organic chemical hydrides by using catalytic reactor on the basis of superheated liquid-film concept

Cited by 37 publications

References 7 publications

On-board H2 generation by catalytic dehydrogenation of hydrocarbon mixtures or fuels

On-board H2 generation by catalytic dehydrogenation of hydrocarbon mixtures or fuels

Topic: Organic Hydride for Hydrogen Energy Carrier

Dehydrogenation Catalyst for Organic Hydride on the Basis of Superheated Liquid-Film Concept

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