Catalyst

Catalyst: A substance that changes the speed or yield of a chemical reaction without being consumed or chemically changed by the chemical reaction.

Catalyst
a substance which increases the rate of a chemical reaction without being consumed in the reaction ...

catalyst
a substance that alters the velocity of a chemical reaction and may be recovered essentially unaltered in form and amount at the end of the reaction.
cation ...

Catalyst
A substance that accelerates chemical change yet is not permanently affected by the reaction (e.g., platinum in an automobile catalytic converter helps change carbon monoxide to carbon dioxide).
Catalytic Cracker Unit ...

Catalyst: A substance that can increase or decrease the rate of a chemical reaction between the other chemical species without being consumed in the process.

Catalyst
An inorganic substance that changes the speed, yield, or required temperature of a chemical reaction without being consumed or chemically changed by the chemical reaction.
Catanadromous ...

Catalyst a substance which without itself undergoing any permanent chemical change, facilitates or enables a reaction between other substances.
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Catalytic Incinerator A control device that oxidizes volatile organic compounds (VOCs) by using a catalyst to promote the combustion process.

Chlorine Nitrate - ClONO2, this is a stratospheric reservoir species for chlorine and nitrogen, two of the catalysts in the breakdown of ozone.

Gas enters the unit and passes over a support material coated with a catalyst (commonly a noble metal such as platinum or rhodium) that promotes oxidation of the organics. Catalytic oxidizers can also be very effective in controlling odors.

A control device that oxidizes volatile organic compounds (VOCs) by using a catalyst to promote the combustion process. Catalytic incinerators require lower temperatures than conventional thermal incinerators, thus saving fuel and other costs.

enzyme
Biological catalyst: a protein, nucleic acid or a conjugate of a protein with another compound (coenzyme).

Canister or Cartridge: A container with a filter, sorbent, or catalyst, or combination of these items, which removes specific contaminants from the air passed through the container.

A proteinaceous organic substance, produced within an organism, that acts like a catalyst. See also adaptive enzyme, constitutive enzyme, endoenzyme, and exoenzyme.
eolian deposit ...

protein A polypeptide consisting of amino acids. In their biologically active states, proteins function as catalysts in metabolism and, to some extent, as structural elements of cells and tissues.
proteolysis ...

the bacteria produced hydrogenase, which split the hydrogen into electrons that bonded with palladium trapped in the converter waste, and then stuck to the bacteria. Once the bacteria were coated with palladium, they could be recycled as catalysts ...

See also: Water, Organic, Environment, Air, Waste