Catalyst

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Catalyst Meaning and Definition in Dictionary

Definitions from Wordnet 2.0


  • something that causes an important event to happen; "the invasion acted as a catalyst to unite the country"
  • (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected

Definitions from Wiktionary


  • (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected ,
  • something that causes an important event to happen; "the invasion acted as a catalyst to unite the country"

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Catalyst Meaning and Definition in Wikipedia


Catalysis is the change in speed (rate) of a chemical reaction due to the help of a catalyst. Unlike other chemicals which take part in the reaction, a catalyst is not consumed by the reaction itself. A catalyst may participate in many chemical reactions. Catalysts that speed the reaction are called positive catalysts. Catalysts that slow the reaction are called negative catalysts, or inhibitors. Substances that increase the activity of catalysts are called promoters, and substances that deactivate catalysts are called catalytic poisons.

A catalyst is something which changes the rate of a chemical reaction. An example is when manganese oxide (MnO2) is added to hydrogen peroxide (H2O2), and the hydrogen peroxide starts to break up into water and oxygen. Catalysts are either of natural or synthetic origin. Catalysts are useful because they leave no residue in the solution they have speeded up. A catalyst can also be used in a reaction again and again as it is not used up. There are many catalysts in our body which play an important part in many biochemical reactions. These are called enzymes. Most catalysts work by lowering the 'activation energy' of a reaction. This allows less energy to be used, thus speeding up the reaction. The opposite of a catalyst is an inhibitor. Inhibitors slow down reactions. Some of them are found in snake venom and are dangerous for our nervous system or heart.


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Catalyst Sample Sentences in News


  • Catalyst Announces Initiation of an Expanded Access Program to Provide Firdapse at No Cost to U.S. Patients with ...
    Catalyst Pharmaceutical Partners, Inc. announced today it has begun the process required to establish an expanded access program to make available in the United States its investigational potassium channel inhibitor, Firdapse™ , to patients diagnosed with Lambert-Eaton Myasthenic Syndrome through their neuromuscular disease specialists. Read more on this news related to 'Catalyst'
  • Catalyst Copper Appoints New Director
    Catalyst Copper Appoints New Director Read more on this news related to 'Catalyst'
  • AMD Posts Catalyst 14.4 Release Candidate Drivers
    Coinciding with this week’s launch of the Radeon R9 295X2, AMD has posted their latest Catalyst drivers, now at version 14.4. Catalyst 14.4 is the first driver set for the R9 295X2, and once certified will be AMD’s first WHQL driver release of the year. As we briefly noted in our review of the R9 295X2 , Catalyst 14.4 is from a new driver branch (14.100), and Read more on this news related to 'Catalyst'

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