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Related Concept Videos

Compact Bone01:27

Compact Bone

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Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
Compact bone, also called cortical bone, is the denser, stronger of the two types of bone tissue. It is found under the periosteum and in the diaphyses of long bones, where it provides support and protection. The microscopic structural unit of compact bone is called an osteon, or haversian system. Each osteon is composed of concentric rings of calcified...
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Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
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Hydrogen Bonds

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A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
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Compacting Factor test01:22

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The compacting factor test is a method used to assess the workability of concrete. It is  especially suitable for concrete mixes containing aggregates up to one and a half inches in size. This test involves specialized equipment consisting of two truncated cone-shaped hoppers and a cylinder, all with polished interior surfaces to minimize friction.
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Reduction of Alkenes: Catalytic Hydrogenation02:13

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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
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Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

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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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Hydrogen Production and Utilization in a Membrane Reactor
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Recent Developments in Compact Membrane Reactors with Hydrogen Separation.

Alexander Wunsch1, Paul Kant2, Marijan Mohr3

  • 1Institute for Micro Process Engineering, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany. alexander.wunsch@kit.edu.

Membranes
|November 17, 2018
PubMed
Summary
This summary is machine-generated.

This study presents a cost-effective method for fabricating palladium membranes using suspension plasma spraying. This innovation supports small-scale hydrogen production and chemical heat storage from renewable energy sources.

Keywords:
LOHChydrogenmembrane reactormicrostructuredpalladiumsuspension plasma spraying

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Renewable Energy

Background:

  • Small and medium-scale hydrogen production and chemical heat storage are crucial for renewable energy integration.
  • Micro-membrane reactors utilizing palladium membranes are key for processes like methane reforming and liquid organic hydrogen carrier dehydrogenation.
  • Current palladium membrane fabrication methods, such as rolling and electroless plating, can be costly.

Purpose of the Study:

  • To develop a cost-effective fabrication method for palladium membranes suitable for micro-membrane reactors.
  • To present suspension plasma spraying as a viable alternative for producing palladium membranes.
  • To advance technologies for hydrogen production and chemical heat storage.

Main Methods:

  • Fabrication of palladium membranes using suspension plasma spraying.
  • Integration of these membranes into stacked plate micro-membrane reactor systems.
  • Evaluation of the developed membranes for hydrogen production applications.

Main Results:

  • Successful fabrication of palladium membranes via suspension plasma spraying.
  • Demonstration of the potential for cost reduction compared to traditional methods.
  • Validation of the membranes' suitability for micro-membrane reactor applications.

Conclusions:

  • Suspension plasma spraying offers a promising, cost-effective route for palladium membrane production.
  • This method can facilitate the development of advanced micro-membrane reactors for hydrogen and heat storage.
  • The research contributes to the advancement of renewable energy technologies.