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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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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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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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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

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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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Radical Chain-Growth Polymerization: Chain Branching01:17

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The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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Types of Step-Growth Polymers: Polyesters01:20

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the polymer...
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Hydrogen Production and Utilization in a Membrane Reactor
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Hydrogen Production from Polyethylene Pyrolysis.

Vladislav V Lobodin1, James E Parks2, Charles E A Finney1

  • 1Buildings and Transportation Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6472, United States.

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|January 8, 2026
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Summary
This summary is machine-generated.

Hydrogen production from waste plastics like high-density polyethylene (HDPE) offers a sustainable energy solution. Pyrolysis converts plastic waste into hydrogen, reducing landfill burden and greenhouse gas emissions.

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A Simple, Low-cost, and Robust System to Measure the Volume of Hydrogen Evolved by Chemical Reactions with Aqueous Solutions
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Area of Science:

  • Sustainable Energy
  • Waste Management
  • Chemical Engineering

Background:

  • Hydrogen is crucial for clean energy and decarbonization, but traditional production relies on fossil fuels.
  • Alternative feedstocks like waste plastics and municipal solid waste (MSW) are being explored for lower-emission hydrogen production.
  • Thermochemical processes, including pyrolysis, can convert waste into hydrogen, addressing waste management and reducing methane emissions.

Purpose of the Study:

  • To investigate hydrogen production from high-density polyethylene (HDPE) via pyrolysis.
  • To establish a baseline methodology for hydrogen generation from plastic pyrolysis.
  • To analyze the impact of temperature and catalysts on HDPE conversion and hydrogen yield.

Main Methods:

  • Pyrolysis of high-density polyethylene (HDPE) at varying temperatures, with and without catalysts.
  • Gas chromatography-mass spectrometry (GC/MS) analysis to identify product distributions.
  • Quantification of hydrogen formation from the pyrolysis process.

Main Results:

  • Pyrolysis temperature significantly affects HDPE conversion and hydrogen yield.
  • Catalysts can influence the product distribution and efficiency of hydrogen production.
  • GC/MS analysis provided insights into the conversion pathways of plastic waste during pyrolysis.

Conclusions:

  • Plastic pyrolysis presents a viable route for sustainable hydrogen production, utilizing waste feedstocks.
  • This study provides foundational data for optimizing catalysts and processes for efficient hydrogen generation from mixed plastic waste.
  • The findings support the dual benefit of waste reduction and cleaner energy production.