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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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Introduction to Mechanisms of Enzyme Catalysis01:13

Introduction to Mechanisms of Enzyme Catalysis

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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: 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 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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Factors Influencing the Rate of Chemical Reactions01:22

Factors Influencing the Rate of Chemical Reactions

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A variety of factors influence the rate of chemical reactions. For a chemical reaction to happen, atoms must collide with enough energy to overcome the repulsion between their electrons. This energy is called activation energy. Factors influencing the rate of reaction either lower the activation energy or increase the likelihood of a successful collision.
Concentration and Pressure:
The more particles present within a given space, the more likely those particles are to bump into one another....
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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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Related Experiment Video

Updated: Dec 10, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Published on: April 10, 2018

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Theoretical insights into single-atom catalysts.

Lulu Li1, Xin Chang, Xiaoyun Lin

  • 1Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China. zjzhao@tju.edu.cn.

Chemical Society Reviews
|September 2, 2020
PubMed
Summary
This summary is machine-generated.

Single-atom catalysts (SACs) offer superior metal utilization and catalytic activity. Theoretical calculations are crucial for understanding SACs' active sites and reaction mechanisms, overcoming limitations of traditional characterization methods.

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Area of Science:

  • Heterogeneous catalysis
  • Materials science
  • Computational chemistry

Background:

  • Single-atom catalysts (SACs) exhibit 100% metal atom utilization and enhanced catalytic performance over nanoparticle catalysts.
  • The isolated nature of single atoms in SACs presents challenges for characterization using conventional methods.
  • Understanding active sites and reaction mechanisms is vital for advancing SAC technology.

Purpose of the Study:

  • To elucidate the fundamental properties and diverse applications of single-atom catalysts.
  • To highlight the significance of theoretical calculations in investigating SACs.
  • To outline current challenges and future directions for computational studies of SACs.

Main Methods:

  • Computational simulations were employed to investigate key applications of SACs.
  • Theoretical calculations were used to determine the nature of active sites.
  • Analysis of reaction mechanisms was performed using computational approaches.

Main Results:

  • Computational simulations provided insights into the behavior of SACs in various applications.
  • The distinctive properties of SACs were elucidated through theoretical analysis.
  • The study established the importance of computational methods for understanding SACs.

Conclusions:

  • Theoretical calculations are essential for deciphering the complexities of single-atom catalysts.
  • Further computational research is needed to address challenges and explore future perspectives in SAC development.
  • SACs represent a promising frontier in catalysis, with computational modeling playing a key role in their advancement.