Homogeneous Catalyst — Definition, Formula, Properties & Uses | AllChemicals | AllChemicals

Also Known As	Solution catalyst, dissolved catalyst, homogeneous catalyst system

What is Homogeneous Catalyst?

A catalyst that is in the same phase as the reactants, typically in solution. Homogeneous catalysts offer better contact with reactants but are harder to separate. Examples include acid catalysis in esterification and enzymatic catalysis in biological systems.

Properties & Characteristics

A homogeneous catalyst is a catalyst in the same phase as the reactants, most commonly dissolved in the same liquid phase. Homogeneous catalysts offer better mixing and easier access to all reaction sites compared to heterogeneous catalysts. They allow structural tuning of the active site via ligand design (particularly in organometallic catalysis). However, they can be difficult to separate from the product.

Uses & Applications

Homogeneous catalysts include: H⁺ for acid-catalysed reactions (esterification, hydrolysis), Wilkinson's catalyst [RhCl(PPh₃)₃] for alkene hydrogenation, Ziegler-Natta organometallic catalysts for polymerisation, palladium complexes in cross-coupling (Suzuki, Heck, Negishi), and enzymes in biochemistry.

Safety Information

Organometallic homogeneous catalysts often contain toxic or precious metals (Rh, Pd, Pt, Ru, Os). Ligands such as phosphines (PPh₃) are toxic and air-sensitive. Cyanide-containing catalysts generate HCN on hydrolysis. Proper inert atmosphere techniques, ventilation, and waste disposal are required.

Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.

Key Facts

Term Homogeneous Catalyst

Index All "H" terms

Synonyms Solution catalyst, dissolved catalyst, homogeneous catalyst system

Frequently Asked Questions

What is Homogeneous Catalyst?

A catalyst that is in the same phase as the reactants, typically in solution. Homogeneous catalysts offer better contact with reactants but are harder to separate. Examples include acid catalysis in esterification and enzymatic catalysis in biological systems.

What is Homogeneous Catalyst used for?

Is Homogeneous Catalyst hazardous?

More "H" Terms

Haber Process N₂ + 3H₂ ⇌ 2NH₃ | ΔH = −92 kJ/mol Hafnium Hf Half Cell Half Life Half-Cell E = E° − (RT/nF)lnQ Half-Life A(t) = A₀e^(−λt); t½ = ln2/λ Half-Reaction Halide X⁻ (e.g., F⁻, Cl⁻, Br⁻, I⁻) Halogen F₂, Cl₂, Br₂, I₂, At; Group 17; ns²np⁵ valence configuration Halogenation C-X + Cl₂/Br₂ (hv or AlCl₃) → C-X(halogen); EAS or radical pathway Halogens Hard Acid Hard acid: small, highly charged, low polarisability (e.g., H⁺, Mg²⁺, Al³⁺)

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