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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.
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.
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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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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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Chemical Bonds
The electrons of the outermost energy level determine the energetic stability of the atom and its tendency to form chemical bonds with other atoms. The innermost electron shell has a maximum capacity of two electrons, but the next two electron shells can each have a maximum of eight electrons. This is known as the octet rule, which states that, with the exception of the innermost shell, atoms are most stable energetically when they have eight electrons in their valence shell, the...
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Updated: Jun 18, 2025

Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis
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3He adsorbed on molecular hydrogen surfaces.

M C Gordillo1,2, J Boronat3

  • 1Departamento de Sistemas Físicos, Químicos y Naturales, Universidad Pablo de Olavide, Carretera de Utrera km 1, E-41013 Sevilla, Spain.

The Journal of Chemical Physics
|August 2, 2024
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Summary

Researchers studied helium-3 (3He) on molecular hydrogen layers over graphite. They found a 2D gas phase in equilibrium with a stable 7/12 commensurate solid structure, matching experimental data.

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Area of Science:

  • Condensed matter physics
  • Quantum fluids
  • Surface science

Background:

  • Helium-3 (3He) exhibits unique quantum behavior at low temperatures.
  • Adsorption on solid substrates provides a platform to study 2D quantum systems.
  • Previous studies explored 3He on various substrates, but its behavior on molecular hydrogen layers is less understood.

Purpose of the Study:

  • To calculate the phase diagram of 3He adsorbed on a first solid layer of molecular hydrogen isotopes (H2, HD, D2) on graphite.
  • To investigate the stability of different 3He phases and their phase transitions.
  • To compare theoretical predictions with available experimental data.

Main Methods:

  • Diffusion Monte Carlo (DMC) technique was employed for quantum mechanical simulations.
  • Calculations focused on the phase diagram of 3He.
  • Simulations considered 3He adsorbed on pre-formed solid layers of H2, HD, and D2 on a graphite substrate.

Main Results:

  • A two-dimensional (2D) gas phase of 3He was observed, extending from the infinite dilution limit.
  • This 2D gas is in equilibrium with a 7/12 commensurate solid structure.
  • The 7/12 commensurate structure was found to be more stable than incommensurate triangular solids at similar densities.
  • Qualitatively similar phase diagrams were obtained for 3He on H2, HD, and D2 layers.

Conclusions:

  • The study provides a detailed theoretical phase diagram for 3He on molecular hydrogen layers.
  • The findings highlight the stability of the 7/12 commensurate phase for 2D 3He.
  • The theoretical results show good agreement with existing experimental observations, validating the simulation approach.