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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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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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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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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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Catalytically Perfect Enzymes01:07

Catalytically Perfect Enzymes

4.3K
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...
4.3K
Radical Reactivity: Concentration Effects01:20

Radical Reactivity: Concentration Effects

1.6K
In a radical reaction, the concentration of starting materials governs the selectivity of a radical. For example, the reaction between an alkyl halide and an alkene, in the presence of tin hydride and AIBN, begins with the generation of a tin radical. The generated radical then abstracts halogen from the alkyl halide, producing an alkyl radical. This alkyl radical can either react with tin hydride, yielding an alkane, or add to an alkene, generating a nitrile-stabilized radical, eventually...
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Updated: Oct 15, 2025

Synthesis of Zeolites Using the ADOR Assembly-Disassembly-Organization-Reassembly Route
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Diffusion and catalyst efficiency in hierarchical zeolite catalysts.

Peng Peng1, Xiong-Hou Gao2, Zi-Feng Yan1

  • 1State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China.

National Science Review
|October 25, 2021
PubMed
Summary
This summary is machine-generated.

Hierarchical zeolites improve diffusion and catalyst efficiency by creating mesopores at the zeolitic component level and optimizing structure at the industrial catalyst level. This enhances chemical reaction engineering for advanced materials.

Keywords:
advanced characterizationdiffusioneffectiveness factorhierarchical zeoliteindustrial catalystpore connectivity

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Area of Science:

  • Materials Chemistry
  • Catalysis
  • Chemical Engineering

Background:

  • Hierarchical zeolites are crucial for overcoming diffusion limitations in catalysis.
  • Enhanced catalyst efficiency is a key objective in porous materials chemistry.
  • Understanding diffusion and efficiency at multiple hierarchical levels is vital.

Purpose of the Study:

  • To review diffusion and catalyst efficiency in hierarchical zeolites and industrial catalysts.
  • To analyze benefits of hierarchical structures from a chemical reaction engineering perspective.
  • To present strategies for enhancing catalyst effectiveness factor through mesopore design.

Main Methods:

  • Analysis of three mesopore strategies: functional, auxiliary, and integrated mesopores.
  • Examination of component location and interconnectivity in industrial catalysts.
  • Utilizing advanced in situ and operando spectroscopic, microscopic, and diffraction techniques.

Main Results:

  • Identified three mesopore types ('functional', 'auxiliary', 'integrated') to improve zeolite component diffusion.
  • Demonstrated the importance of pore interconnectivity in multi-component industrial catalysts.
  • Highlighted the role of advanced characterization techniques in understanding hierarchical catalysts.

Conclusions:

  • Hierarchical zeolite design at both component and catalyst body levels is essential for optimal performance.
  • Rational design strategies can significantly enhance diffusion and catalytic efficiency.
  • Advanced characterization is key to comprehending and designing next-generation zeolite catalysts.