Catalytic Promoters and Inhibitors, types of Catalysts

Catalytic Promoters and Inhibitors

Catalyst may be organic or inorganic in nature. They could also be grouped into negative or positive catalysts and they could otherwise be regarded as catalytic promoters or inhibitors. The organic catalysts are generally referred to as enzymes.


Positive and Negative Catalysts: A catalyst which increases the rate of a reaction is a positive catalyst. An example of a positive catalyst is manganese(IV) oxide which is used to catalyze the decomposition of potassium trioxochlorate(V). Positive catalysts are important in chemical industry since they can speed up slow reactions in a sufficient manner to make them commercially feasible.


                              2KClO3(s)   →  2KCl(s) + 3O2(g)

READ MORE:  Acclimatization --- Adjustment to High Altitudes

A catalyst which decreases the rate of a reaction is a negative catalyst. For instance, tetraoxophosphate(V) acid decreases the rate of decomposition of hydrogen peroxide, while a 2% ethanol solution suppresses the oxidation of trichloromethane by air. It is therefore important to state that negative catalysts are used to suppress undesirable reactions.

Enzymes, otherwise known as organic catalysts helps in the digestion of food we eat. They cause blood to clot and fruit juices to ferment. The industrial manufacture of alcohol from starches and sugar is facilitated by enzymes.(The unripe fruit and leaves of pawpaw contains papains, which is an enzyme that breaks down proteins and is used to tenderize meat before cooking.)


READ MORE:  7 Types of Epithelial Tissues and their Functional Roles

Catalytic Promoters and Inhibitors: Catalytic promoters and inhibitors are not catalysts as they only influence the rate of a reaction by affecting the efficiency of the catalysts. For instance, the iron catalyst used in the Haber process for the production of ammonia is activated by the addition of trace amounts of aluminium oxide or molybdenum. Substances that which improve the efficiency of a catalyst are known as promoters.

However, there are substances which inhibit catalysts. These substances are referred to as inhibitors or catalytic poisons. Hydrogen sulphide, arsenic(III) oxide, hydrogen cyanide and mercury salts are catalyst poisons which can harm us by inhibiting important enzymes in our body.


READ MORE:  Physical and Chemical Properties of Hydrogen Peroxide

Originally posted 2015-12-11 15:31:35.

About the Author

Tony Onwujiariri
Tony is an Avid Tech enthusiast that loves Scientific Inventions and Tech Products. He blogs Passionately on Science and Technology related niches and spends most of his time on Research in Content Management and SEO. Tony loves Sugar and has been in love with Don Williams since he was a toddler on Diapers.

Be the first to comment on "Catalytic Promoters and Inhibitors, types of Catalysts"

Leave a comment

Your email address will not be published.


Catalytic Promoters and Inhibitors, types of Catalysts

by Tony Onwujiariri time to read: 1 min