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Related Concept Videos

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

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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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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: Catalytic Hydrogenation02:13

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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 Benzene to Cyclohexane: Catalytic Hydrogenation01:28

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Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
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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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Recent progress in efficient zeolite-based catalysts for catalytic conversion of C1 molecules.

Yaqi Lai1, Feng Li1, Xiangju Meng1

  • 1State Key Laboratory of Soil Pollution Control and Safety, Department of Chemistry, Zhejiang University, Hangzhou, 310058, China. mengxj@zju.edu.cn.

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Zeolites are key heterogeneous catalysts for converting C1 molecules like methane and CO2 into valuable chemicals, crucial for carbon neutrality. This review details how zeolite properties influence C1 catalysis, including methane oxidation and CO2 hydrogenation.

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Area of Science:

  • Catalysis
  • Materials Science
  • Chemical Engineering

Background:

  • C1 molecule conversion (methane, methanol, CO, CO2) is vital for high-value chemicals and carbon neutrality.
  • Zeolites offer high surface area, adsorption capacity, uniform pores, and stability, making them effective heterogeneous catalysts.
  • Tailored zeolite design is critical for optimizing C1 valorization processes.

Purpose of the Study:

  • To review the impact of zeolite characteristics on C1 molecule catalysis.
  • To analyze the interplay between zeolite structural, chemical, and physicochemical properties and C1 transformations.
  • To highlight advancements in zeolite-based C1 conversion technologies.

Main Methods:

  • Literature review focusing on zeolite properties and C1 catalysis.
  • Analysis of structure-property-activity relationships in zeolites.
  • Examination of various C1 conversion reactions including selective methane oxidation, methanol-to-olefins (MTO), Fischer-Tropsch (FT) synthesis, and CO2 hydrogenation.

Main Results:

  • Zeolite framework topology, hierarchical design, acidity, wettability, and confinement effects significantly influence C1 catalytic performance.
  • Specific zeolite properties dictate selectivity and efficiency in reactions like MTO and FT synthesis.
  • Understanding these structure-based effects enables targeted catalyst design for improved C1 valorization.

Conclusions:

  • Zeolite characteristics are decisive factors in the efficiency and selectivity of C1 catalytic conversions.
  • Targeted design of zeolites based on structural, chemical, and confinement properties is essential for advancing C1 valorization.
  • This review provides insights into optimizing zeolites for sustainable chemical production and carbon neutrality goals.