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Related Concept Videos

Catalysis02:50

Catalysis

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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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Turnover Number and Catalytic Efficiency01:19

Turnover Number and Catalytic Efficiency

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The turnover number of an enzyme is the maximum number of substrate molecules it can transform per unit time. Turnover numbers for most enzymes range from 1 to 1000 molecules per second. Catalase has the known highest turnover number, capable of converting up to 2.8×106 molecules of hydrogen peroxide into water and oxygen per second. Lysozyme has the lowest known turnover number of half a molecule per second.
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Introduction to Mechanisms of Enzyme Catalysis01:13

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For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes...
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Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

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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.
The hydrogenation process takes place on the...
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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

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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.
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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.
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Catalytic Stability Studies Employing Dedicated Model Catalysts.

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Understanding catalyst stability is crucial for industrial processes. This study uses model materials to investigate Deacon catalysts, revealing methods to improve their long-term performance and activity in chlorine recovery.

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Area of Science:

  • Heterogeneous catalysis
  • Materials science
  • Surface chemistry
  • Theoretical chemistry

Background:

  • Long-term stability of heterogeneous catalysts is critical for industrial applications.
  • Current understanding of catalyst stability limitations, especially for Deacon catalysts, is poor.
  • High-throughput screening is insufficient for identifying long-term stable catalysts.

Purpose of the Study:

  • To address the knowledge gap in catalyst stability by investigating model catalyst materials.
  • To deepen the microscopic understanding of stability issues in Deacon catalysts (RuO2 and CeO2-based).
  • To explore methods for enhancing catalyst stability under harsh reaction conditions.

Main Methods:

  • Synthesis of model catalyst materials with well-defined morphologies (nanofibers, nanoparticles, ultrathin layers).
  • Investigation of Deacon catalysts (RuO2, CeO2, Ce-Zr oxides) for HCl aerobic oxidation.
  • Development of a quasi-steady-state kinetic approach to model catalyst chlorination.
  • Characterization using electron microscopy and surface chemistry techniques.
  • Atomic Layer Deposition (ALD) for creating ultrathin catalyst coatings.

Main Results:

  • Identified key stability issues: deep chlorination, volatile chloride leaching, and particle sintering.
  • Demonstrated that water addition or higher temperatures can suppress CeO2 nanocube chlorination.
  • Confirmed the stabilizing effect of Zr in Ce-Zr oxide nanorods for the Deacon process.
  • Showcased ultrathin CeO2 coatings on ZrO2 particles via ALD for enhanced stability.

Conclusions:

  • Model catalyst materials with defined morphologies are essential for linking theory and experiment in stability studies.
  • Process parameters like water addition and temperature significantly impact catalyst stability.
  • Advanced synthesis techniques like ALD offer promising routes to highly stable catalysts for industrial applications.