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Updated: Jul 21, 2025

Temperature-programmed Deoxygenation of Acetic Acid on Molybdenum Carbide Catalysts
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Temperature-programmed Deoxygenation of Acetic Acid on Molybdenum Carbide Catalysts

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数学催化剂失活模型:一个小小的回顾

Zaidoon M Shakor1, Emad N Al-Shafei2

  • 1Chemical Engineering Department, University of Technology Baghdad Iraq Zaidoon.M.Shakor@uotechnology.edu.iq.

RSC advances
|July 28, 2023
PubMed
概括

确定准确的催化剂停用模型对于优化催化过程至关重要. 本综述涵盖了二氧化碳化,菲舍尔-托普施,生物燃料和化石燃料的模型,以改善催化剂活性表示.

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Catalysis02:50

Catalysis

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 Efficiency

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Factors Influencing the Rate of Chemical Reactions

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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Induced-fit Model01:13

Induced-fit Model

Most chemical reactions in cells require enzymes—biological catalysts that speed up the reaction without being consumed or permanently changed. They reduce the activation energy needed to convert the reactants into products. Enzymes are proteins, that usually work by binding to a substrate—a reactant molecule that they act upon.
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Catalytically Perfect Enzymes

The theory of catalytically perfect enzymes was first proposed by W.J. Albery and J. R. Knowles in 1976. These enzymes catalyze biochemical reactions at high-speed. Their catalytic efficiency values range from 108-109 M-1s-1. These enzymes are also called 'diffusion-controlled' as the only rate-limiting step in the catalysis is that of the substrate diffusion into the active site. Examples include triose phosphate isomerase, fumarase, and superoxide dismutase.
 
Most enzymes...
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Enzymes02:34

Enzymes

Inside living organisms, enzymes act as catalysts for many biochemical reactions involved in cellular metabolism. The role of enzymes is to reduce the activation energies of biochemical reactions by forming complexes with its substrates. The lowering of activation energies favor an increase in the rates of biochemical reactions.
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