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{{BioPsy}}
 
{{BioPsy}}
 
[[Image:Catalyst_effect.png|thumb|right|292px|Generic graph showing the effect of a catalyst in an hypothetical exothermic chemical reaction. Notice that the catalysed (red) pathway, despite having a lower activation energy, produces the same final result.]]
 
[[Image:Catalyst_effect.png|thumb|right|292px|Generic graph showing the effect of a catalyst in an hypothetical exothermic chemical reaction. Notice that the catalysed (red) pathway, despite having a lower activation energy, produces the same final result.]]
In [[chemistry]] and [[biology]], '''catalysis''' is the acceleration (increase in [[reaction rate|rate]]) of a [[chemical reaction]] by means of a substance, called a [[catalyst]], that is itself not consumed by the overall reaction. The word is derived from the [[Greek language|Greek]] [[noun]] κατάλυσις, related to the [[verb]] καταλύειν, meaning ''to annul'' or ''to untie'' or ''to pick up''.
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In [[chemistry]] and [[biology]], '''catalysis''' is the acceleration (increase in [[reaction rate|rate]]) of a [[chemical reaction]] by means of a substance, called a [[catalyst]], that is itself not consumed by the overall reaction. The word is derived from the Greek [[noun]] κατάλυσις, related to the [[verb]] καταλύειν, meaning ''to annul'' or ''to untie'' or ''to pick up''.
   
In Chinese, the symbol for the "catalyst" is the same as for "marriage broker" - which is exactly how catalysts can be thought of: a substance that brings molecules together in a reaction without getting involved in the reaction, or marriage, and can be used repeatedly without affecting the overall reaction.
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==See also==
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*[[Enzymes]]
   
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[[Category:Catalysts]]
   
   
==Importance of Catalysis==
 
 
Catalysis is a very important process from an industrial point of view since the production of most industrially important chemicals involve catalysis. The earliest commercial processes are the [[Haber process]] for [[ammonia]] synthesis and the [[Fischer-Tropsch synthesis]]. Research into catalysis is a major field in applied science, and involves many fields of chemistry, notably in [[organometallic chemistry]],
 
and physics.
 
Catalysis is important in many aspects of [[environmental science]], from the [[catalytic converter]] in automobiles to the causes of the [[ozone hole]].
 
 
==Catalytic processes==
 
*[[Acid-base catalysis]]
 
*[[Catalytic converter]]s made from [[platinum]] and [[rhodium]] break down some of the more harmful byproducts of automobile exhaust.
 
*[[Fuel cell]]s
 
*[[Fischer-Tropsch synthesis]].
 
*[[Haber process]] (synthesis of [[ammonia]] from [[nitrogen|nitrogen]] and [[hydrogen]], where ordinary [[iron]] is used as a catalyst)
 
*[[Hydrogenation]]
 
*[[Methanol]] synthesis
 
*[[Nitric acid]] production
 
*[[Petroleum]] refining and processing
 
**[[Alkylation]]
 
**[[Catalytic cracking]] - breaking long-chain hydrocarbons into smaller pieces
 
**[[Naphtha]] reforming
 
*[[Steam reforming]] of [[hydrocarbons]] to produce [[synthesis gas]]
 
*[[Sulfuric acid]] production
 
*[[Transesterification]]
 
*[[Ziegler-Natta catalyst|Olefin polymerisation]]
 
 
== See also==
 
* [[Catalyst]]
 
* [[Autocatalysis]]
 
 
== External links==
 
* W.A. Herrmann Technische Universität presentation [http://aci.anorg.chemie.tu-muenchen.de/wah/vortraege/catalysis.pdf]
 
* [[University of York]] catalyst pages [http://www.uyseg.org/catalysis/pages/cat_frames.htm]
 
 
[[Category:Catalysts]]
 
 
[[de:Katalyse]]
 
[[es:Catálisis]]
 
[[fr:Catalyse]]
 
[[nl:Katalyse]]
 
[[pt:Catálise]]
 
[[sk:Katalýza]]
 
[[zh:催化]]
 
 
{{enWP|Catalysis}}
 
{{enWP|Catalysis}}

Latest revision as of 22:43, December 21, 2008

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Catalyst effect

Generic graph showing the effect of a catalyst in an hypothetical exothermic chemical reaction. Notice that the catalysed (red) pathway, despite having a lower activation energy, produces the same final result.

In chemistry and biology, catalysis is the acceleration (increase in rate) of a chemical reaction by means of a substance, called a catalyst, that is itself not consumed by the overall reaction. The word is derived from the Greek noun κατάλυσις, related to the verb καταλύειν, meaning to annul or to untie or to pick up.

See alsoEdit


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