Negative Catalyst
| Also Known As | Inhibitor, retarder, catalyst poison, antiknock additive |
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What is Negative Catalyst?
A negative catalyst (also called an inhibitor or retarder) is a substance that decreases the rate of a chemical reaction when added to the reaction mixture. Unlike positive catalysts (which are not consumed), negative catalysts slow down reactions by interfering with the reaction mechanism — typically by reacting with intermediates, free radicals, or the catalyst itself. They are widely used to prevent unwanted reactions.
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
A negative catalyst (also called an inhibitor or retarder) is a substance that decreases the rate of a chemical reaction when added to the reaction mixture. Unlike positive catalysts (which are not consumed), negative catalysts slow down reactions by interfering with the reaction mechanism — typically by reacting with intermediates, free radicals, or the catalyst itself. They are widely used to prevent unwanted reactions.
Food antioxidants (vitamin E, BHA, BHT — inhibit oxidative rancidity). Rubber antioxidants (prevent degradation). Polymerization inhibitors (monomers stored with inhibitors). Anti-corrosion additives. Drug stabilizers. Engine antiknock additives (historical: tetraethyllead). Industrial explosion pre…
Negative catalysts themselves may be hazardous. Tetraethyllead: highly toxic neurotoxin (now banned). Some radical inhibitors (phenyl compounds): irritants. Catalyst poisons (CO, H₂S, As): toxic gases. Handle with appropriate precautions.