TERMIUM Plus^®

Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 DEF

A substance used in small proportion, that augments the rate of a chemical reaction, and in theory remains unchanged chemically at the end of the reaction.  3, record 1, English, - catalyst

Record number: 1, Textual support number: 1 OBS

catalyst: term and definition standardized by ISO.  4, record 1, English, - catalyst

Record number: 1, Textual support number: 2 OBS

Catalysts in living systems are called "enzymes."  5, record 1, English, - catalyst

Record number: 1, Textual support number: 3 OBS

catalyst: term officially approved by the Lexicon Project Committee (New Brunswick).  4, record 1, English, - catalyst

Record number: 1, Textual support number: 1 PHR

bimetallic cluster, colloidal, complex, heterogeneous acidic, iron, man-made, metallic hydrogenation, organic, positive(metal ion), Raney nickel, solid catalyst  4, record 1, English, - catalyst

Record number: 1, Textual support number: 2 PHR

pore distribution of a catalyst, reactivation of a catalyst  4, record 1, English, - catalyst

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 DEF

Substance qui, utilisée en faible proportion, augmente la vitesse d'une réaction chimique et qui, théoriquement, reste chimiquement inchangée à la fin de la réaction.  2, record 1, French, - catalyseur

Record number: 1, Textual support number: 1 OBS

catalyseur : terme et définition normalisés par l'ISO.  3, record 1, French, - catalyseur

Record number: 1, Textual support number: 2 OBS

Il n'existe qu'un petit nombre de catalyseurs capables d'effectuer dans des conditions optimales une réaction donnée. Le catalyseur réel adapté à un procédé particulier est le plus souvent un solide complexe. Il comporte une phase active qui, pour développer une surface maximale, est déposée sur un support, parfois à dose très faible s'il s'agit d'éléments coûteux comme les métaux précieux. Cependant, certains catalyseurs dits massiques sont uniquement constitués de phase(s) active(s) [...] [que l'on peut classer en trois grandes familles] : les métaux; les semi-conducteurs, oxydes, sulfures ou autres ions supportés; les oxydes isolants, acides ou basiques.  4, record 1, French, - catalyseur

Record number: 1, Textual support number: 3 OBS

catalyseur : terme uniformisé par le Comité du projet de lexiques (Nouveau-Brunswick).  3, record 1, French, - catalyseur

Record number: 1, Textual support number: 1 PHR

catalyseur au fer, catalyseur massique, catalyseur solide  3, record 1, French, - catalyseur

Record number: 1, Textual support number: 2 PHR

poison de catalyseur  3, record 1, French, - catalyseur

Record 1,  Textual support,  Spanish

Record number: 1, Textual support number: 1 DEF

Sustancia que usada en pequeñas cantidades hace aumentar la velocidad de una reacción química, y en teoría, permanece químicamente igual al final de la reacción.  1, record 1, Spanish, - catalizador

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 CONT

In oxychlorination, ethylene reacts with dry HCl and either air or pure oxygen in a heterogeneous catalytic reaction to form EDC and water.... While there are many different commercial oxychlorination processes, in each case the reaction is carried out in the vapor phase in either a fixed bed or fluid bed reactor containing a modified Deacon catalyst.  3, record 2, English, - oxychlorination

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 DEF

Réaction du chlore obtenue en faisant agir un mélange d'oxygène et d'acide chlorhydrique sur un composé chimique.  2, record 2, French, - oxychloration

Record 2,  Textual support,  Spanish

Record 3,  Textual support,  English

Record number: 3, Textual support number: 1 CONT

Heterogeneous catalysts, in contrast to homogeneous catalysts, form a separate phase from reactants and products and are usually solids. They have a microporous structure and a very large internal surface area(it may reach 1000 m²/g) but these colloidal catalysts are often inactivated by the presence of small amounts of poisons. Poisons act by combining with an active site in the catalyst surface and rendering it inactive.  2, record 3, English, - homogeneous%20catalyst

Record 3,  Textual support,  French

Record 3,  Textual support,  Spanish

Record 4,  Textual support,  English

Record number: 4, Textual support number: 1 CONT

Heterogeneous catalysts, in contrast to homogeneous catalysts, form a separate phase from reactants and products and are usually solids. They have a microporous structure and a very large internal surface area(it may reach 1000 m²/g) but these colloidal catalysts are often inactivated by the presence of small amounts of poisons. Poisons act by combining with an active site in the catalyst surface and rendering it inactive.  2, record 4, English, - heterogeneous%20catalyst

Record 4,  Textual support,  French

Record 4,  Textual support,  Spanish

Record 5,  Textual support,  English

Record number: 5, Textual support number: 1 CONT

Organometallic complex catalysts tend to be highly active, specific, and selective, and may resist poisoning better than heterogeneous systems. The catalytic center may have two metal sites. Organometallic catalysts have a central transition-metal atom or ion bonded to molecules known as ligands which form a polyhedron around the metal. The nature of the metal and ligands critically influences the electronic structure of the complex. The coordination bonding properties of the metal are a key feature of the catalytic complexes. Important reactions of catalyst complexes are ligand exchange, oxidative addition, and the insertion reaction.  1, record 5, English, - organometallic%20catalyst

Record 5,  Textual support,  French

Record 5,  Textual support,  Spanish