catalyst is used to speed up the reaction but it does not react itself with reactant and remain unchanged
catalyst is a substance that help in chemical reaction but not actually react with reactants...
Catalyst is such a chemical substance, which is used in a chemical reaction to increase/decrease the rate of the reaction and the reaction the substance remains intact.This is called Catalyst.For example, during preparation of Oxygen from potassium chlorate in the laboratory manganese-die-oxide is used as a catalyst.
Catalysts are something that will speed up a reaction. Catalysts are usually acids but platinum catalysts are used in the industrial production of nitric acid (4 NH3 + 5 O2 ---4 NO + 6 H2O). Vanadium pentoxide is used as the catalyst in the industrial manufacture of sulfuric acid (S + O2 ---SO2. 2 SO2 + O2 ---2 SO3) The catalyst is used to make the reaction between sulfur dioxide and oxygen A LOT faster. Catalysts are also used in explosives. The most common is sulfuric acid (eg. nitroglycerin, TNT, nitrocellulose). Weaker acids like citric acid is used in the synthesis of HMTD, an organic peroxide. Hydrochloric acid is also a commonly used catalyst. Manganese dioxide can be used as a catalyst to generate oxygen when added to potassium chlorate or hydrogen peroxide. (2 H2O2 + MnO2 ---2 H2O + O2 + MnO2 (it is not necessary to include the catalyst in an equation, however). (2 KClO3 + MnO2 ---3 O2 + 2 KCl + MnO2).
Catalyst is a chemical substance which is used in chemical reactions in relatively small amounts to start up or increase the rate of the reaction without being consumed in the process. For example, Sulfuric Acid is used to dehydrate Ethanol to Ethylene. Enzymes in living beings are biological catalysts. Manganese dioxide, used to decompose Hydrogen Peroxide to Oxygen and Water. For detailed answer.... en.wikipedia.org/wiki/Catalysis
