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Stability of Conjugated Dienes

Stability of Conjugated Dienes

Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.

Hydrogen Bonds

Hydrogen Bonds

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!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....

Reduction of Alkenes: Catalytic Hydrogenation

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...

Metallic Solids

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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...

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Related Experiment Video

Updated: Sep 4, 2025

Supercritical Nitrogen Processing for the Purification of Reactive Porous Materials

Supercritical Nitrogen Processing for the Purification of Reactive Porous Materials

Published on: May 15, 2015

High-Entropy Alloys for Solid Hydrogen Storage: Potentials and Prospects.

Thakur Prasad Yadav¹, Abhishek Kumar¹, Satish Kumar Verma¹

¹Department of Physics, Institute of Science, Hydrogen Energy Centre, Banaras Hindu University, Varanasi, Uttar Pradesh India.

Transactions of the Indian National Academy of Engineering : an International Journal of Engineering and Technology

|July 15, 2022

Summary

This summary is machine-generated.

High-entropy alloys show promise for solid hydrogen storage, offering a safer alternative to compressed gas or liquid hydrogen. Research explores their synthesis and properties for efficient hydrogen energy applications.

Keywords:

Complex intermetallics High-entropy alloys High-entropy hydrides Hydrogen energy Hydrogen storage

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Last Updated: Sep 4, 2025

Supercritical Nitrogen Processing for the Purification of Reactive Porous Materials

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Area of Science:

Materials Science
Energy Storage
Hydrogen Technology

Background:

Hydrogen energy requires efficient and safe storage solutions, as current methods (high-pressure gas, cryogenic liquid) have significant safety and infrastructure challenges.
Solid-state hydrogen storage in materials offers higher concentration and potentially safer storage compared to gaseous or liquid forms.
Hydride-forming alloys and intermetallic compounds are key candidates for solid hydrogen storage, with multicomponent high-entropy alloys (HEAs) emerging as promising materials.

Purpose of the Study:

To review the utilization of multicomponent high-entropy alloys as solid hydrogen storage materials.
To present research on the synthesis, characterization, and hydrogen storage properties of specific HEAs.
To evaluate the potential of HEAs for practical hydrogen energy applications.

Main Methods:

Synthesis of equi-atomic Ti-Zr-V-Cr-Ni high-entropy alloys.
Structural and microstructural characterization of the synthesized alloys.
Experimental investigation of hydrogen storage capacity and properties.

Main Results:

Successfully synthesized Ti-Zr-V-Cr-Ni equi-atomic hydride-forming high-entropy alloys.
Preliminary investigations show a maximum hydrogen storage capacity of 1.78 wt% in the studied system.
The observed storage capacity is comparable to other established hydrogen storage materials.

Conclusions:

Multicomponent high-entropy alloys are viable candidates for solid-state hydrogen storage.
The synthesized Ti-Zr-V-Cr-Ni HEAs demonstrate potential for hydrogen energy applications.
Further research into HEAs could lead to improved hydrogen storage technologies.