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Related Concept Videos

2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

276
Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
276
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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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.
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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Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

12.4K
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...
12.4K
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

848
Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
848
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

268
Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
268
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

7.9K
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.
7.9K

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Related Experiment Video

Updated: Aug 23, 2025

Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis
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Combinatorial neutron imaging methods for hydrogenation catalysts.

Marin Nikolic1,2, Filippo Longo1,2, Emanuel Billeter1

  • 1Laboratory for Advanced Analytical Technologies, Empa - Swiss Federal Laboratories for Material Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland. marin.nikolic@empa.ch.

Physical Chemistry Chemical Physics : PCCP
|November 4, 2022
PubMed
Summary
This summary is machine-generated.

A new method, Combinatorial Neutron Imaging (CONI), accelerates heterogeneous catalyst development. It quantifies hydrogen adsorption and absorption in numerous samples simultaneously, aiding in designing optimal catalysts.

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Area of Science:

  • Materials Science
  • Catalysis
  • Chemical Engineering

Background:

  • Heterogeneous catalysts possess complex structures influenced by preparation parameters.
  • Rational catalyst design is hindered by numerous empirical variables.
  • Combinatorial and high-throughput methods offer accelerated catalyst development.

Purpose of the Study:

  • To introduce Combinatorial Neutron Imaging (CONI) for rapid catalyst screening.
  • To quantify hydrogen adsorption/absorption and hydrogen-deuterium exchange.
  • To enable simultaneous analysis of over 50 catalyst samples.

Main Methods:

  • Utilizing neutron imaging for quantitative analysis.
  • Employing hydrogen adsorption/absorption and hydrogen-deuterium exchange reactions.
  • Applying a combinatorial approach to screen multiple catalysts concurrently.

Main Results:

  • CONI successfully measures hydrogen adsorption and absorption in multiple samples at once.
  • The method distinguishes between reversible bulk absorption and irreversible surface adsorption.
  • Quantitative data on reversibly adsorbed/absorbed hydrogen atoms were obtained for various catalysts.

Conclusions:

  • CONI is a powerful tool for accelerating the discovery and optimization of heterogeneous catalysts.
  • The technique provides crucial quantitative insights into hydrogen-matter interactions.
  • CONI facilitates the screening of numerous catalyst candidates efficiently.