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Related Concept Videos

Catalysis02:50

Catalysis

26.8K
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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Oxidative Cleavage of Alkenes: Ozonolysis01:46

Oxidative Cleavage of Alkenes: Ozonolysis

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In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
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Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

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Alkenes can be dihydroxylated using potassium permanganate.  The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

10.1K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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E2 Reaction: Kinetics and Mechanism02:45

E2 Reaction: Kinetics and Mechanism

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SN2 substitutions and E2 eliminations of alkyl halides proceed via a concerted pathway. While the nucleophile attacks the alpha carbon in SN2 reactions, it functions as a strong base and abstracts a beta hydrogen in the E2 mechanism. The rate-limiting transition state in E2 elimination reactions is characterized by partially broken carbon–hydrogen and carbon–halogen bonds and a partially formed pi bond between the alpha and beta carbons. The beta hydrogen and halide are eliminated...
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Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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Capturing Catalyst Strain Dynamics during Operando CO Oxidation.

Michael Grimes1,2, Clément Atlan1,2, Corentin Chatelier1,2

  • 1Univ. Grenoble Alpes, CEA Grenoble, IRIG, MEM, NRX, 17 rue des Martyrs, F-38000 Grenoble, France.

ACS Nano
|July 15, 2024
PubMed
Summary
This summary is machine-generated.

Investigating platinum nanoparticle strain dynamics during CO oxidation using time-resolved imaging reveals significant surface and subsurface changes. This study offers insights into catalytic nanomaterial adsorption dynamics at the single-particle level under operando conditions.

Keywords:
CO oxidationadsoprtionoperando catalysisstrain imagingstroboscopic imaging

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Area of Science:

  • Materials Science
  • Catalysis
  • Surface Science

Background:

  • Understanding catalyst strain dynamics is key for developing efficient and stable catalysts.
  • Operando studies are essential for observing catalysts under reaction conditions.

Purpose of the Study:

  • To investigate the 3D strain behavior of platinum nanoparticles during CO oxidation.
  • To achieve subsecond time resolution for observing dynamic catalytic processes.

Main Methods:

  • Utilized time-resolved Bragg coherent diffraction imaging.
  • Employed the European Synchrotron (ESRF-EBS) for high-resolution measurements.
  • Studied platinum nanoparticles during CO oxidation reactions.

Main Results:

  • Observed significant strain changes in surface and subsurface regions of Pt nanoparticles.
  • Detected localized strain along the [111] direction.
  • Measured rapid tensile strain increase on Pt {111} facets during CO adsorption.
  • Identified oscillatory strain changes with a 6.4 s period during CO oxidation.
  • Achieved a time resolution of 0.25 s.

Conclusions:

  • The study provides unprecedented insight into the adsorption dynamics of catalytic nanomaterials at the single-particle level.
  • This technique allows for detailed analysis of nanoscale catalytic mechanisms under operando conditions.
  • The findings contribute to the design of improved catalysts by understanding their dynamic behavior.