Catalyst

noun (countable)

/ˈkætəlɪst/

A catalyst is a substance that increases the rate of a chemical reaction without being consumed or permanently altered in the process, by providing an alternative reaction pathway with lower activation energy. Enzymes are biological catalysts (biocatalysts) that drive virtually all metabolic reactions in living organisms. In industrial chemistry, catalytic converters in vehicles use platinum-group metals to oxidise carbon monoxide and unburnt hydrocarbons — a technology mandated under India's Bharat Stage (BS-VI) emission norms since April 2020.

✍️ Usage in a UPSC answer

The introduction of BS-VI fuel standards in India necessitated catalytic converters with platinum-palladium substrates that reduce vehicular NOx emissions by over 90% compared to BS-IV norms, exemplifying industrial catalysis in environmental regulation.

Synonyms

accelerantbiocatalyst (biological context)enzymepromoterfacilitator

Antonyms

inhibitorretardantsuppressantanticatalyst

🌱 Word Family

catalyse/catalyze (verb), catalytic (adjective), catalysis (noun), catalytically (adverb), catalyser/catalyzer (noun)

🔡 Root

Greek katalysis = dissolution, from kata- = down, completely + lyein = to loosen, dissolve

📜 Etymology

The word derives from Greek katalysis (dissolution), used by the Swedish chemist Jöns Jacob Berzelius in 1836 to describe substances that accelerate reactions without being consumed. He coined katalys from Greek kata- (down) and lyein (to loosen), metaphorically describing the 'loosening' of chemical bonds. The broader figurative sense — any person or event that precipitates change — entered English by the late 19th century.

🧠 Memory Hook

A catalyst loosens the path (kata + lyein = loosen down) — imagine a mountain shortcut that lets a hiker reach the valley faster without changing the mountain itself. The catalyst opens a shortcut but remains unchanged.

⚗️ General Science 📖 Seen in: Human Body Systems — Organ Systems, Ph...

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