The catalyst also known as catalyst, in the definition of the junior middle school stage is to change the rate of a chemical reaction, and quality, chemical composition and properties of the material itself remained unchanged before and after participating in a chemical reaction. For example, manganese dioxide can be used as hydrogen peroxide (hydrogen peroxide) decomposition catalysts. Catalystand catalyst for inverse catalyst, catalyst to contribute to the reaction to the positive direction, help to reverse direction in the inverse catalyst reaction.
Catalyst and reactant in the same phase, there is no phase of reaction, called homogeneous catalysis, the catalyst can be homogeneous catalysis forhomogeneous catalyst. Homogeneous catalysts including liquid acid, alkali catalyst and color Seth solid acid and alkaline catalyst. Soluble transition metal compounds(salts and complexes) etc.. Homogeneous catalysts with molecules or ions of independent action, activity center is uniform, with high activity and high selectivity.
In the chemical production, the scientists experiment and life of the catalyst, display one's skill to the full. For example, in the production of sulfuric acid with five of two vanadium catalyst. Nitrogen and hydrogen in ammonia, with multiple packet with iron based catalyst, increase the rate of reaction.In the refinery, the catalyst is ultimately, choose different catalysts, we can get different quality of gasoline,kerosene.
Chemical synthesis of acidic and basic color Seth catalyst. Carbon monoxide and nitric oxide harmful vehicle exhaust, using platinum as a catalyst can be quicklyconverted to carbon dioxide and two nitrogen harmless. Enzyme is a plant, animaland microbial protein with catalytic ability, chemical reaction, almost all theorganisms in under the catalysis of enzyme, brewing industry, the pharmaceutical industry will be used as the catalyst.
The catalyst also known as heterogeneous catalysts in different phase (Phase)reaction, and reaction they catalyze in different states. For example: in the production of margarine, through solid nickel (catalyst), can transform unsaturatedvegetable oil and hydrogen into the saturated fat.