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Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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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: 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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Heterogeneous Catalysis01:22

Heterogeneous Catalysis

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Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
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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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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.
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The hydrogenation process takes place on the...
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Mechanochemically Engineered Bimetallic PtNi/CeO2 Catalysts for Enhanced Methane Steam Reforming.

Andrea Braga1, Marina Armengol-Profitós1, Laia Pascua-Solé1

  • 1Department of Chemical Engineering, Institute of Energy Technologies, and Center for Research in Multiscale Science and Engineering, EEBE, Universitat Politècnica de Catalunya, Eduard Maristany 10-14, Barcelona 08019, Spain.

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Mechanochemical synthesis using ball milling produced highly active bimetallic platinum-nickel/cerium oxide (PtNi/CeO2) catalysts for methane steam reforming (MSR). These catalysts significantly outperformed conventionally prepared ones, showing enhanced performance and potential for coke resistance.

Keywords:
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Area of Science:

  • Materials Science: Synthesis and characterization of advanced catalytic materials.
  • Chemical Engineering: Catalysis for energy conversion and chemical production.

Background:

  • Methane steam reforming (MSR) is crucial for hydrogen production but requires efficient catalysts.
  • Traditional catalyst synthesis methods may not optimize properties for demanding reactions like MSR.
  • Mechanochemical synthesis offers a novel route to tune catalyst structure and performance.

Purpose of the Study:

  • To synthesize bimetallic PtNi/CeO2 catalysts using a mechanochemical ball milling approach.
  • To systematically investigate the impact of milling parameters on catalyst properties and MSR performance.
  • To compare the efficacy of mechanochemically synthesized catalysts against conventionally prepared ones.

Main Methods:

  • Catalyst synthesis via ball milling (mechanochemical approach).
  • Optimization using fractional factorial design of experiments for milling parameters (frequency, time, ball-to-powder ratio).
  • Characterization using XRD, H2-TPR, TEM, Raman spectroscopy, in situ XANES, and NAP-XPS.
  • Catalytic activity testing in a plug flow reactor under high space velocity conditions.

Main Results:

  • Mechanochemically synthesized PtNi/CeO2 catalysts demonstrated superior methane conversion (83.5%) compared to impregnated catalysts (64%) at 700 °C.
  • Increased milling intensity, particularly milling frequency, enhanced catalytic activity by promoting smaller NiO particle formation.
  • In situ studies revealed Pt surface segregation and reduced carbon deposition, indicating coke resistance.

Conclusions:

  • Mechanochemical synthesis is a powerful and scalable method for producing high-performance PtNi/CeO2 catalysts for MSR.
  • Optimized milling parameters significantly improve catalyst structural properties and catalytic activity.
  • The developed catalysts show promise for efficient and durable hydrogen production via methane reforming.