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Related Concept Videos

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

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Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
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Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
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Bench-Scale Membrane Reactor for Methylcyclohexane Dehydrogenation Using Silica Membrane Module.

Masahiro Seshimo1, Hiromi Urai1, Kazuaki Sasa1

  • 1Inorganic Membranes Research Center, Research Institute of Innovative Technology for the Earth (RITE), Kyoto 619-0237, Japan.

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|May 5, 2021
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Summary

Researchers developed long silica membranes for membrane reactors, significantly boosting methylcyclohexane dehydrogenation for hydrogen storage beyond equilibrium limits.

Keywords:
counter-diffusion chemical vapor depositionmembrane reactor modulemethylcyclohexane dehydrogenationsilica membrane

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Area of Science:

  • Chemical Engineering
  • Materials Science
  • Hydrogen Energy

Background:

  • The methylcyclohexane-toluene system is a promising method for hydrogen transport and storage.
  • Membrane reactors can overcome equilibrium limitations in methylcyclohexane dehydrogenation.
  • Challenges exist in modularizing membrane reactors and manufacturing long silica membranes.

Purpose of the Study:

  • To develop long silica membranes for practical application in membrane reactors.
  • To demonstrate enhanced methylcyclohexane dehydrogenation using a membrane reactor module.

Main Methods:

  • Developed 500 mm-length silica membranes using a counter-diffusion chemical vapor deposition method.
  • Constructed a flange-type membrane reactor module with six silica membranes.
  • Tested the membrane reactor module for methylcyclohexane dehydrogenation at 573 K.

Main Results:

  • Achieved high hydrogen permselective performance with the silica membranes (H2 permeance > 1 × 10^-6 mol m^-2 s^-1 Pa^-1, H2/SF6 selectivity > 10,000).
  • Demonstrated effective methylcyclohexane dehydrogenation, reaching approximately 85% conversion.
  • Exceeded the equilibrium conversion of 42% significantly.

Conclusions:

  • Successfully fabricated long silica membranes suitable for membrane reactors.
  • The developed membrane reactor module effectively enhances methylcyclohexane dehydrogenation for hydrogen storage.
  • This advancement offers a viable pathway for efficient hydrogen transport and storage solutions.