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Related Concept Videos

Catalysis02:50

Catalysis

32.0K
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

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...
14.7K
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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Microbes and Methanogenesis01:26

Microbes and Methanogenesis

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Methanogenesis is a critical microbial process in anaerobic ecosystems responsible for the biological production of methane, a potent greenhouse gas and valuable biofuel. This metabolic pathway is primarily facilitated by methanogenic archaea, which thrive in anoxic environments such as wetlands, sediments, and animal gastrointestinal tracts. The absence of oxygen in these habitats prevents aerobic respiration, thereby favoring alternative biochemical pathways for organic matter degradation.In...
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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

9.3K
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.
9.3K
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate

17.8K
Alkenes can be dihydroxylated using potassium permanganate.  The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
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Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
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Catalytic Methane Decomposition over Fe-Al2 O3.

Lu Zhou1, Linga Reddy Enakonda2, Youssef Saih2

  • 1KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia. lu.zhou@kaust.edu.sa.

Chemsuschem
|May 10, 2016
PubMed
Summary

The Fe-FeAl2 O4 structure in Fe-Al2 O3 catalysts is crucial for catalytic methane decomposition (CMD). This structure ensures stable CMD activity at 750°C for extended periods.

Keywords:
decompositionhercynitehydrogenironmethane

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Area of Science:

  • Catalysis
  • Materials Science
  • Chemical Engineering

Background:

  • Catalytic methane decomposition (CMD) is a key process for producing hydrogen and carbon materials.
  • Developing stable and active catalysts is essential for efficient CMD.
  • Iron-aluminum oxide (Fe-Al2 O3) catalysts are promising for CMD applications.

Purpose of the Study:

  • To investigate the role of the Fe-FeAl2 O4 structure in Fe-Al2 O3 catalysts for CMD activity.
  • To evaluate the stability and performance of these catalysts under reaction conditions.

Main Methods:

  • Preparation of Fe-Al2 O3 catalysts using a fusion method.
  • Characterization of catalyst structure and composition.
  • Testing catalytic methane decomposition activity at 750°C after H2 reduction.

Main Results:

  • The presence of a Fe-FeAl2 O4 structure was identified as vital for CMD activity.
  • Fe-Al2 O3 catalysts with 86.5 wt% FeAl2 O4 and 13.5 wt% Fe(0) were prepared.
  • These catalysts exhibited stable CMD activity at 750°C for 10 hours.

Conclusions:

  • The Fe-FeAl2 O4 phase is critical for the high and stable catalytic methane decomposition activity of Fe-Al2 O3 catalysts.
  • Fusion-prepared Fe-Al2 O3 catalysts demonstrate excellent long-term stability for hydrogen and carbon production via CMD.