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Catalysis is the process in which the rate of a chemical reaction is either increased or decreased by means of a chemical substance known as a catalyst. Unlike other reagents that participate in the chemical reaction, a catalyst is not consumed by the reaction itself. The catalyst may participate in multiple chemical transformations. Catalysts that speed the reaction are called positive catalysts. Catalysts that slow down 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. For instance, in the reduction of ethyne to ethene, the catalyst is palladium (Pd) partly "poisoned" with lead(II) acetate (Pb(CH3COO)2). Without the deactivation of the catalyst, the produced ethene will be further reduced to ethane.

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Catalyst

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Wikipedia About Catalyst

Heterogeneous%20cat.JPG

Catalysis is the process in which the rate of a chemical reaction is either increased or decreased by means of a chemical substance known as a catalyst. Unlike other reagents that participate in the chemical reaction, a catalyst is not consumed by the reaction itself. The catalyst may participate in multiple chemical transformations. Catalysts that speed the reaction are called positive catalysts. Catalysts that slow down 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. For instance, in the reduction of ethyne to ethene, the catalyst is palladium (Pd) partly "poisoned" with lead(II) acetate (Pb(CH3COO)2). Without the deactivation of the catalyst, the produced ethene will be further reduced to ethane.

The general feature of catalysis is that the catalytic reaction has a lower rate-limiting free energy change to the transition state than the corresponding uncatalyzed reaction, resulting in a larger reaction rate at the same temperature. However, the mechanistic origin of catalysis is complex. Catalysts may affect the reaction environment favorably, e.g. acid catalysts for reactions of carbonyl compounds, form specific intermediates that are not produced naturally, such as osmate esters in osmium tetroxide-catalyzed dihydroxylation of alkenes, or cause lysis of reagents to reactive forms, such as atomic hydrogen in catalytic hydrogenation.

Kinetically, catalytic reactions behave like typical chemical reactions, i.e. the reaction rate depends on the frequency of contact of the reactants in the rate-determining step. Usually, the catalyst participates in this slow step, and rates are limited by amount of catalyst. In heterogeneous catalysis, the diffusion of reagents to the surface and diffusion of products from the surface can be rate determining. Analogous events associated with substrate binding and product dissociation apply to homogeneous catalysts.

Although catalysts are not consumed by the reaction itself, they may be inhibited, deactivated or destroyed by secondary processes. In heterogeneous catalysis, typical secondary processes include coking where the catalyst becomes covered by polymeric side products. Additionally, heterogeneous catalysts can dissolve into the solution in a solid-liquid system or evaporate in a solid-gas system.

Background

The production of most industrially important chemicals involves catalysis. Similarly, most biochemically significant processes are catalysed. Research into catalysis is a major field in applied science and involves many areas of chemistry, notably in organometallic chemistry and materials science. Catalysis is relevant to many aspects of environmental science, e.g. the catalytic converter in automobiles and the dynamics of the ozone hole. Catalytic reactions are preferred in environmentally friendly green chemistry due to the reduced amount of waste generated, as opposed to stoichiometric reactions in which all reactants are consumed and more side products are formed. The most common catalyst is the proton (H+). Many transition metals and transition metal complexes are used in catalysis as well. Catalysts called enzymes are important in biology.

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catalyst: Definition, Synonyms from Answers.com

catalyst n. Chemistry. A substance, usually used in small amounts relative to the reactants, that modifies and increases the rate of a reactionwww.answers.com/topic/catalyst

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Resources, training, tools, and templates to build web pages and utilize technology in the classroom. ... Team Catalyst. Awards. Jobs. Contact us ...catalyst.washington.edu/

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George Clinton has never lost his groove

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Checked Out: Ohioans' Views on Education 2009' reports on Thomas B. Fordham Institute and Catalyst Ohio survey

The Cleveland Plain DealerOhioans are frustrated with the performance of their public schools but trust their local school officials more than the state, especially when it comes to deciding how to spend tax money. Nine out of 10 want more fairness in school...http://blog.cleveland.com/metro/2009/05/checked_out_ohioans_...

Beef catalyst for EU, US trade deals-Ashton

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Stanford's startup culture stronger than ever

San Jose Mercury NewsStanford's 100-year tradition of entrepreneurialism has been recognized as a catalyst to Silicon Valley's emergence as the globe's pre-eminent tech hub. Even now, with the economy staggering, 'The Farm' is sprouting business ideas and talent as never before, largely because it is teaching entrepreneurship as never before.http://www.mercurynews.com/business/ci_12317917?source=rss

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Best of Ballarat history on offer

Ballarat CourierDr Graham Phillips from ABC TV's Catalyst program was on hand on Saturday and Sunday afternoon presenting his seminars on space and extra-terrestrial activity. Observatory manager Judith Bailey said dozens had visited the observatory to see Ballarat's ... http://www.thecourier.com.au/news/local/news/general/best-of...

Facebook Co-Founder Settles in at General Catalyst: Out to Learn and ...

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Lurie: Through 100 or so at-bats, here are baseball's heroes and ...

Contra Costa TimesJason Bartlett, Tampa Bay: Shortstop a catalyst for the Rays (.351 avg.). Aaron Hill, Toronto: Blue Jays second baseman is putting up Joe Morgan-type numbers in '09 (.351 avg., 8 home runs, 28 RBI). Adam Lind, Toronto: Outfielder one of the reasons ... http://www.contracostatimes.com/sports/ci_12332546

Chien-Ming Wang Diagnosis: Foot is Still Catalyst of Disaster

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Saudi index climbs to 26-week high on back of telecoms, petro

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Search results for Catalyst

Catalyst (software) - Wikipedia, the free encyclopedia

Catalyst is an open source web application framework written in Perl, that closely follows the model-view-controller (MVC) architecture, and supports a number of experimental web ... http://en.wikipedia.org/wiki/Catalyst_(software)

Catalyst

Resources, training, tools, and templates to build web pages and utilize technology in the classroom.http://catalyst.washington.edu/

Catalyst Development Corporation

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Catalyst (ON Semiconductor) Distributor

Mouser is an authorized distributor of Catalyst Semiconductor.Catalyst Semiconductor offers Flash Memories, Parallel and Serial EEPROMS with I2C, SPI and Microwire interfaces ... http://www.mouser.com/catalyst/

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Wikipedia results for Catalyst

Catalysis - Wikipedia, the free encyclopedia

Catalysis is the process in which the rate of a chemical reaction is increased by means of a chemical substance known as a catalyst. Unlike other reagents that participate in the ... http://en.wikipedia.org/wiki/Catalyst

Catalyst (software) - Wikipedia, the free encyclopedia

Catalyst is an open source web application framework written in Perl, that closely follows the model-view-controller (MVC) architecture, and supports a number of experimental web ... http://en.wikipedia.org/wiki/Catalyst_(software)

Catalyst (magazine) - Wikipedia, the free encyclopedia

Catalyst is a student newspaper published at the Royal Melbourne Institute of Technology in Melbourne, Australia. The magazine is produced by the RMIT Student Union.http://en.wikipedia.org/wiki/Catalyst_%28magazine%29

ATI Catalyst - Wikipedia, the free encyclopedia

ATI Catalyst is a utility software driver package for several ATI products for several operating systems. The Catalyst software was instituted after the release of the Radeon 8500.http://en.wikipedia.org/wiki/ATI_Catalyst

Catalyst (album) - Wikipedia, the free encyclopedia

Catalyst is the fourth studio album by New Found Glory. It was released on May 18, 2004, and certified gold by the RIAA on August 18, 2004. The album includes an enhanced CD ... http://en.wikipedia.org/wiki/Catalyst_%28album%29
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Vizu launches Ad Catalyst

Vizu launches Ad CatalystWisdom of crowds service moves beyond crowdsourcing Vizu is expected to announce on Wednesday its Ad Catalyist, a new service to give advertisers and marketers a better way to...Flash - Video

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Answers for Catalyst

imptrdacycatalyst ?imptrdacyCatalyst is any substance(physical or chemical) thats speeds up/slows down a chemical reaction. I think I've answered your question...janet.holsburgWhat catalyst must be present in the hydrogenation of an alkene?janet.holsburgThe most active would be Pt or Pd, but Ni could be used. Industrially for small syntheses, Pt or Pd would be the catalyst of choice, but because of their expense, large scale e.g. production of mar...Samuel PWhat is the catalyst for the dehydration of alcohols to alkenes?Samuel Pboth are possible catalysts. mainly because they are strong polyprotic acids. dehydration requires heating but the temperature depends on the alcohol itself and the concentration of the acid. ethanol ...buffed_n_shyIs there a catalyst to reduce the activation energy for the hydrolysis of water?buffed_n_shyIntroduction of a small amount of fluorine gas into the water should, in theory, have a slight lowering of the activation energy for the hydrolysis of water. The reason is that the hydrogen bonds for...Lori TWhat causes a catalyst monitor from running?Lori Tthat misfire code will keep the efficiency test from running. if you reset that light after the repairs were done. you will have to complete a few drive cycles to get that test to run. but if there we...
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