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Related Concept Videos

Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

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.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the surface of...
Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride01:26

Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride

Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation reactions,...
Acid Halides to Alcohols: LiAlH4 Reduction01:19

Acid Halides to Alcohols: LiAlH4 Reduction

Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Carboxylic Acids to Primary Alcohols: Hydride Reduction01:17

Carboxylic Acids to Primary Alcohols: Hydride Reduction

Carboxylic acids, upon reaction with strong reducing agents such as lithium aluminum hydride followed by hydrolysis, undergo reduction to form primary alcohols.

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Supercritical Nitrogen Processing for the Purification of Reactive Porous Materials
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Supercritical Nitrogen Processing for the Purification of Reactive Porous Materials

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Reversible hydrogen storage in reactive hydride composites under 400 K.

Nicholas J Hall1, David M Grant2, Jacob L Prosser1

  • 1Advanced Materials Research Group, Faculty of Engineering, University of Nottingham, Nottingham, United Kingdom.

Nature Communications
|July 10, 2026
PubMed
Summary

Researchers developed advanced Reactive Hydride Composites (RHCs) for efficient hydrogen storage. These novel materials enable reversible hydrogen release at lower temperatures, crucial for widespread hydrogen energy adoption.

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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex

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Last Updated: Jul 12, 2026

Supercritical Nitrogen Processing for the Purification of Reactive Porous Materials
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A Simple, Low-cost, and Robust System to Measure the Volume of Hydrogen Evolved by Chemical Reactions with Aqueous Solutions
06:32

A Simple, Low-cost, and Robust System to Measure the Volume of Hydrogen Evolved by Chemical Reactions with Aqueous Solutions

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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Energy Storage

Background:

  • Hydrogen storage is critical for renewable energy, but complex hydrides face temperature limitations for release and cycling.
  • Lightweight complex hydrides offer high storage densities, yet practical application is hindered by their operating temperatures.

Purpose of the Study:

  • To develop novel ternary Reactive Hydride Composites (RHCs) for improved hydrogen storage.
  • To systematically tune material composition for lower-temperature hydrogen release and enhanced cyclability.

Main Methods:

  • Systematic tuning of LiBH₄ content within the Mg(NH₂)₂ - LiH framework.
  • Investigating hydrogen release/reversibility at various temperatures.
  • Analyzing reaction pathways within the RHCs.

Main Results:

  • Achieved reversible hydrogen release starting below 393 K, a 100 K decrease from the baseline Mg(NH₂)₂ - LiH system.
  • Demonstrated a hydrogen storage capacity of 3.1 wt% in the tuned RHCs.
  • Confirmed RHCs operate within the usable range of low-grade waste heat.

Conclusions:

  • Ternary RHCs offer a promising pathway for practical hydrogen storage applications.
  • The developed RHCs are suitable for stationary and onboard hydrogen storage, utilizing waste heat.
  • Understanding reaction pathways will guide the design of next-generation hydrogen storage materials.