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Heterogeneous Catalysis

Heterogeneous Catalysis

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...

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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...

Reduction of Alkenes: Catalytic Hydrogenation

Reduction of Alkenes: Catalytic Hydrogenation

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 surface of...

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

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.

Catalysis

Catalysis

Catalysis influences the rate of chemical reactions by providing an alternative reaction pathway with lower activation energy. A catalyst speeds up a reaction, but it is not consumed during the process. The fundamental principle of catalysis is the ability of a catalyst to alter the reaction mechanism, often introducing a more efficient pathway than the uncatalyzed process.In a catalyzed reaction, the catalyst participates directly in the reaction mechanism. It interacts with reactants to form...

Catalysis

Catalysis

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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Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy

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Homogeneous catalysis using iron complexes: recent developments in selective reductions.

Kathrin Junge¹, Kristin Schröder, Matthias Beller

¹Leibniz-Institut für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Str. 29a, 18059 Rostock, Germany.

Chemical Communications (Cambridge, England)

|March 26, 2011

Summary

Iron offers an affordable, non-toxic alternative for homogeneous catalysis. This review explores its potential in hydrogenation, transfer hydrogenation, and hydrosilylation, advocating for increased iron utilization in catalysis research.

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Area of Science:

Catalysis
Organometallic Chemistry
Green Chemistry

Background:

Iron is an abundant, inexpensive, and low-toxicity metal.
Despite its advantages, iron's application in homogeneous catalysis is underdeveloped compared to other transition metals.
There is a need to explore and promote the use of iron catalysts.

Purpose of the Study:

To highlight recent advancements in iron-catalyzed homogeneous reactions.
To showcase the potential of iron in key catalytic transformations.
To encourage further research and application of iron in catalysis.

Main Methods:

Review of literature on iron-catalyzed hydrogenation.
Analysis of studies on iron-catalyzed transfer hydrogenation.
Examination of research on iron-catalyzed hydrosilylation.

Main Results:

Iron catalysts show promising activity in hydrogenation, transfer hydrogenation, and hydrosilylation reactions.
These reactions demonstrate the versatility and potential of iron as a catalytic metal.
Successful examples illustrate the feasibility of replacing precious metals with iron.

Conclusions:

Iron is a highly promising metal for homogeneous catalysis due to its availability, low cost, and low toxicity.
The reviewed examples demonstrate significant potential for iron in various catalytic applications.
Further development and application of iron catalysts can lead to more sustainable and economical catalytic processes.