Hydrogen recovery from cyclohexane as a chemical hydrogen carrier using a palladium membrane reactor

Itoh, Naotsugu; Tamura, Eisuke; Hara, Shigeki; Takahashi, Tomohiro; Shono, Atsushi; Satoh, Kazumi; Namba, Tatsuji

doi:10.1016/s0920-5861(03)00210-4

Cited by 75 publications

(30 citation statements)

References 13 publications

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“…% of cyclohexane), which is very attractive compared with metal hydrides (at most 3 wt. %), the dehydrogenated products, benzene and toluene, can be reversibly hydrogenated and reused and those are all liquids at ordinary temperatures, no CO 2 emission in the dehydrogenation process will be rated highly in terms of environmental issues, whereas the steam reforming process of methanol produces not only hydrogen but also CO 2 [38]. In this way, a lot of work has been carried out on the hydrogen production from cyclohexane by using membrane technologies.…”

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confidence: 99%

A comparison of hydrogen and methanol production in a thermally coupled membrane reactor for co-current and counter-current flows

Rahimpour

Pourazadi

2010

Int. J. Energy Res.

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SUMMARYThis work considers three concentric tube reactors to prepare pure hydrogen, especially applicable in fuel cell technologies, with zero CO 2 emission. Hydrogen and methanol production rates are compared in a thermally coupled exothermic and endothermic reactor for co-current and counter-current modes. Synthesis of methanol is coupled with dehydrogenation of cyclohexane as a high content hydrogen carrier (7.1 wt%). The efficient coupling of exothermic and endothermic reactions increases the profitability of operation of the reactor, reduces the size of reactor and decreases the operational and capital costs. By inserting a hydrogen-perm selective membrane into the reactor configuration, hydrogen can permeate selectively into the membrane, and hence, the third tube receives hydrogen. The simulation results are compared with the corresponded results for an industrial methanol fixed-bed reactor, which operates under the same feed conditions. The influence of some operating variables is investigated on methanol and hydrogen yields during the performance of reactor. The results show higher methanol conversion, as the same as conventional reactor, and hydrogen for co-current flow.

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confidence: 99%

A comparison of hydrogen and methanol production in a thermally coupled membrane reactor for co-current and counter-current flows

Rahimpour

Pourazadi

2010

Int. J. Energy Res.

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“…The reactor was installed in a constant temperature air bath and the wall temperature was monitored with a thermocouple. Experiments for cyclohexane dehydrogenation were carried out at 573 K. Detailed experimental results have been presented elsewhere 3) .…”

Section: 1 Single Palladium Membrane Tube Reactor For Recovering mentioning

confidence: 99%

Analysis of Equilibrium-limited Dehydrogenation and Steam Reforming in Palladium Membrane Reactors

Itoh

2012

J. Jpn. Petrol. Inst.

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Palladium membrane reactors have the potential to achieve higher conversion as well as larger recovery of purified hydrogen in the steam reforming reaction, even at lower temperatures. However, increasing feed rate resulted in larger deviation from the ideal analytical model assuming plug flow and isothermal conditions. This study developed a computational fluid dynamics (CFD) model, which takes into account the concentration, temperature and velocity distributions due to mass, heat transfer and flow resistances in the membrane reactor. The CFD model clearly showed that large temperature and concentration distributions were formed in both the radial and axial directions, so reducing the reactor performance compared to the ideal reactor. The correctness of the model was verified for the dehydrogenation of cyclohexane in a single tube type as well as a multi-tube type of palladium membrane reactor. Furthermore, the multi-tube model was applicable for simulation of changes in the reactor design such as the membrane dimension. World-leading potentials of palladium membrane reactors in Japan are evaluated by introducing major projects.

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“…For the dehydrogenation reaction of cyclohexane, the reaction kinetics and parameters applied in this simulation were taken from the literature, as reported by Itoh et al 22),52), 53) , as follows: …”

Section: Consideration Of a Membrane Reactor Model From A Chemical Enmentioning

confidence: 99%

Development of Membrane Reactors for Dehydrogenating Organic Chemical Hydrides to Supply High-purity Hydrogen

Akamatsu

Nakao

2011

J. Jpn. Petrol. Inst.

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This review describes recent developments in the field of membrane reactors for obtaining high-purity hydrogen from organic chemical hydrides using hydrogen-selective amorphous silica membranes prepared by chemical vapor deposition. The application of such membrane reactors for hydrogen production reactions enables us to achieve higher conversion because of equilibrium shifts and to obtain high-purity hydrogen in one step, thus accomplishing an effective hydrogen supply. The most important issue in developing membrane reactors is the selection and preparation of appropriate hydrogen-selective silica membranes for each dehydrogenation reaction. Initially, the pore-size control method was developed by changing chemical structures of silica precursors in the chemical vapor deposition step. Using these membranes, membrane reactors for dehydrogenating cyclohexane or methylcyclohexane were developed and equilibrium shifts were achieved under various reaction conditions. High-purity hydrogen ( 99.9 %) was stably attained by operating the membrane reactors with neither carrier gas nor sweep gas.

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Hydrogen recovery from cyclohexane as a chemical hydrogen carrier using a palladium membrane reactor

Cited by 75 publications

References 13 publications

A comparison of hydrogen and methanol production in a thermally coupled membrane reactor for co-current and counter-current flows

A comparison of hydrogen and methanol production in a thermally coupled membrane reactor for co-current and counter-current flows

Analysis of Equilibrium-limited Dehydrogenation and Steam Reforming in Palladium Membrane Reactors

Development of Membrane Reactors for Dehydrogenating Organic Chemical Hydrides to Supply High-purity Hydrogen

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