A catalyst (Greek: καταλύτης, catalytēs) is a substance that accelerates the rate (speed) of a chemical reaction (see also catalysis). Chemical catalysts, the focus of this article, participate in reactions but are neither chemical reactants nor chemical products. More generally, one may sometimes call anything which accelerates a reaction without itself being consumed or transformed a catalyst (for example, a "catalyst for political change"). Catalyst - Catalysts and reaction energetics. C ...

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Catalyst - Catalysts and reaction energetics Catalyst - Types of catalysts Catalyst - Poisoning a Catalyst Catalyst - Commonly used catalysts

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Catalyst, Catalyst - Catalysts and reaction energetics, Catalyst - Types of catalysts, Catalyst - Poisoning a Catalyst, Catalyst - Commonly used catalysts

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Catalysts can be either heterogeneous or homogeneous. Heterogeneous catalysts are present in different phases from the reactants (e.g. a solid catalyst in a liquid reaction mixture), whereas homogenous catalysts are in the same phase (e.g. a dissolved catalyst in a liquid reaction mixture). A simple model for heterogeneous catalysis involves the catalyst providing a surface on which the reactants (or substrates) temporarily become adsorbed. Bonds in the substrate become weakened sufficiently for new to be created. The bonds between the products and the cat ...

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Catalyst, Catalyst - Catalysts and reaction energetics, Catalyst - Types of catalysts, Catalyst - Poisoning a Catalyst, Catalyst - Commonly used catalysts

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A catalytic converter is a device used to reduce the emissions from an internal combustion engine. Most commonly used in an automobile's exhaust system, catalytic converters are now commonly used on generator sets, forklifts, mining equipment, trucks, buses, trains, and other machines that have engines to provide an environment for a chemical reaction where unburned hydrocarbons are more completely combusted. Automobile converters use platinum or palladium and rhodium as catalysts. Hence the combustion (redox) process continues, but o ...

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Catalytic converter - Purpose and function of catalytic converters Catalytic converter - Catalyst Poisoning Catalytic converter - Technical details Catalytic converter - Regulations Catalytic converter - Patents

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Industrially, formaldehyde is produced by the catalytic oxidation of methanol. The most commonly used catalysts are silver metal or a mixture of an iron oxide with molybdenum and vanadium. In the more commonly used iron oxide system (Formox process), methanol and oxygen react at 250°C to produce formaldehyde according to the chemical equation 2 CH3OH + O2 → ...

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Formaldehyde, Formaldehyde - Properties, Formaldehyde - Production, Formaldehyde - Uses, Formaldehyde - Health effects

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Today, synthesis gas is most commonly produced from the methane component in natural gas rather than from coal. Three processes are commercially practiced. At moderate pressures of 1 to 2 MPa (10–20 atm) and high temperatures (around 850 °C), methane reacts with steam on a nickel catalyst to produce syngas according to the chemical equation CH4 + H2O → CO + 3 H2 This reaction, commonly called steam-methane reforming or SMR, is endothermic and the heat transfer limitations ...

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Methanol, Methanol - History, Methanol - Production, Methanol - Uses, Methanol - Health and safety

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In organic chemistry, peroxide is a specific functional group or a molecule containing that functional group. ROOR' Organic peroxides tend to decompose easily to free radicals of the form: RO· This makes them useful as catalysts for some types of polymerisation, such as the polyester resins used in glass-reinforced plastics. MEKP (methyl ethyl ketone peroxide) is commonly used for this purpose. However, the same property also means that organic peroxides can accidentally in ...

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Peroxide, Peroxide - Colloquial meaning, Peroxide - Organic chemistry, Peroxide - Inorganic chemistry

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Also known as "peroxyacetone", Acetone peroxide most commonly refers to the cyclic trimer TCAP (tri-cyclic acetone peroxide, or tri-cyclo), also called triacetone triperoxide (TATP), obtained by mixing hydrogen peroxide with acetone using a small amount of acid (mentioned above) as a catalyst. The cyclic dimer (C6H12O4) and open monomer and dimer are also formed, but under proper conditions the cyclic trimer is the primary product. A tetrameric form was also described.(Not describe ...

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Acetone peroxide, Acetone peroxide - Chemistry, Acetone peroxide - Industrial occurrence, Acetone peroxide - Accidental byproduct

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Iron(III) chloride is probably the most widely used etching material[1]. It is commonly used for etching copper in the production of printed circuit boards. This occurs by the redox reaction FeCl3 + Cu → FeCl2 + CuCl followed by FeCl3 + CuCl → FeCl2 + CuCl2 Iron(III) chloride is also used as a catalyst for the reaction of ethylene with chlorine, forming ethylene dichloride (1,2-Dichloroethane), an important commodity chemical, which is mainly used for the industrial production of vi ...

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IronIII chloride, IronIII chloride - Chemical properties, IronIII chloride - Preparation and production, IronIII chloride - Uses, IronIII chloride - Precautions, IronIII chloride - Suppliers/Manufacturers

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Solid fuel grains are usually molded from a thermoset elastomer (which doubles as fuel), additional fuel, oxidizer, and catalyst. HTPB (PBAN is also used) is commonly used for this purpose. Ammonium perchlorate is the most common oxidizer used today. The fuel is cast in different forms for different purposes. Slow, long burning rockets have a cylinder shaped grain, burning from one end to the other. Most grains, however, are cast with a hollow cross section, burning from the inside out (and outside in, if not c ...

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Solid rocket, Solid rocket - Basic Concepts, Solid rocket - Design, Solid rocket - Grain, Solid rocket - Casing, Solid rocket - Nozzle, Solid rocket - Performance, Solid rocket - Amateur rocketry, Solid rocket - Advanced research

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Anthrax spores can survive for long periods of time without a host when they are released. Methods of cleaning up the site of anthrax attack or accident commonly use oxidizing agents such as peroxides. These agents can destroy bacterial spores but they work slowly. To speed up the process, trace amounts of a non-toxic catalyst composed of iron and tetro-amido macrocyclic ligands is combined with sodium carbonate and bicarbonate and made into a spray. This spray is applied to an infected area and is followed by another spray ...

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Anthrax, Anthrax - Exposure, Anthrax - Means of infection, Anthrax - Pulmonary pneumonic respiratory inhalation anthrax, Anthrax - Gastrointestinal gastroenteric anthrax, Anthrax - Cutaneous skin anthrax, Anthrax - Treatment and prevention, Anthrax - Site cleanup, Anthrax - Description of the bacterium, Anthrax - Biological warfare, Anthrax - Pasteur

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Cincinnati Bengals - The Ickey Shuffle. The most commonly recognized contribution comes from the "Ickey Shuffle", a celebratory dance created by Bengals running back Ickey Woods in his rookie season of 1988 during the Bengals' Super Bowl run. This dance, done after Woods would score a touchdown, was the catalyst for the NFL instituting penalties against excessive celebratory performances (resulting in the backronym "No Fun League"), and before the 1989 season was over it was relegated to the sidelines. (although not before Darrell Waltrip used ...

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Cincinnati Bengals, Cincinnati Bengals - Franchise history, Cincinnati Bengals - The first three seasons, Cincinnati Bengals - The 1970s, Cincinnati Bengals - The 1980s, Cincinnati Bengals - The 1990s, Cincinnati Bengals - The Early 2000s, Cincinnati Bengals - Season-by-season, Cincinnati Bengals - Contributions to NFL Culture, Cincinnati Bengals - The Ickey Shuffle, Cincinnati Bengals - No Huddle Offense, Cincinnati Bengals - West Coast Offense/Paul Brown's Offense, Cincinnati Bengals - Players of note, Cincinnati Bengals - Current roster, Cincinnati Bengals - Pro Football Hall of Famers, Cincinnati Bengals - Retired numbers, Cincinnati Bengals - Reserved numbers, Cincinnati Bengals - External link

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