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Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride01:26

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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.
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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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Updated: May 21, 2025

Studying Surfactant Effects on Hydrate Crystallization at Oil-Water Interfaces Using a Low-Cost Integrated Modular Peltier Device
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Surfactant-Mediated Interfacial Hydrogen Evolution Reaction.

Boubakar Sanogo1, Pratibha Dogra1, Kangkana Kalita1

  • 1Department of Chemical and Materials Engineering, University of Alberta, T6G 1H9 Edmonton, Canada.

ACS Applied Materials & Interfaces
|March 19, 2025
PubMed
Summary
This summary is machine-generated.

Surfactants can control hydrogen production from liquid organic hydrogen carriers (LOHCs). Cationic surfactants accelerate hydrogen release, while others slow it, enabling tunable clean energy generation.

Keywords:
emulsionhydrogen evolution reactionphase-transfer catalysisreacting dropletsurfactant

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Area of Science:

  • Chemical Engineering
  • Materials Science
  • Sustainable Energy

Background:

  • Hydrogen is a key clean energy carrier, but efficient storage and transport remain challenging.
  • Liquid organic hydrogen carriers (LOHCs) present a viable solution for hydrogen management.
  • Controlling the reaction kinetics of LOHCs is crucial for practical hydrogen production.

Purpose of the Study:

  • To investigate the interfacial hydrogen evolution reaction of polymethylhydrosiloxane (PMH), a representative LOHC, with water.
  • To explore the role of surfactants in controlling the reaction kinetics at the PMH-water interface.
  • To demonstrate strategies for manipulating interfacial properties for on-demand hydrogen production.

Main Methods:

  • Studied the hydrogen production rate at a planar PMH-water interface catalyzed by sodium hydroxide.
  • Investigated the effects of anionic (Tween 20, SDS) and cationic (CTAB) surfactants on reaction kinetics.
  • Analyzed hydrogen bubble growth in PMH microdroplets dispersed in surfactant solutions.

Main Results:

  • Anionic surfactants (Tween 20, SDS) decreased hydrogen formation rates by 5-20 times.
  • Cationic surfactants (CTAB) acted as pseudo phase-transfer catalysts, increasing hydrogen formation rates up to 3-fold.
  • Dispersing PMH microdroplets in cationic surfactant solutions yielded up to 45% hydrogen conversion.

Conclusions:

  • Surfactant selection effectively controls the interfacial dehydrogenation rate of LOHCs.
  • Tailoring liquid-liquid interfaces with surfactants offers a method for managing hydrogen production kinetics.
  • This research provides strategies for on-demand hydrogen generation from LOHCs.