Catalyst will induce a chemical reaction changes to make the reaction
faster or slow. Catalyst's own composition, property and quality does
not change before and after the reaction. Its relationship with reaction
system just like a lock and key, it has high selectivity or
specificity. It does not have catalyst for all chemical reactions. For
example, manganese dioxide has catalytic when potassium chlorate is
heated and decomposed, speeding up the chemical reaction rate,. But it
does not necessarily have a catalytic role to other chemical reactions.
Some chemical reactions are not the only catalyst, because during the
heat and decomposition of potassium chlorate, magnesium oxide, iron
oxide, copper oxide, etc play a role of catalytic.
Catalyst
plays an important role in chemical production, scientists experiment
and life activities. For example, five oxidation II vanadium as catalyst
in the sulfuric acid production. In refinery factory, select different
catalyst can get different quality of gasoline and kerosene. Car exhaust
has carbon monoxide and a oxidation nitrogen, so use platinum or other
metal as catalyst can quickly turn the two into harmless carbon dioxide
and nitrogen. Enzyme has catalytic capacity of protein produced by
plant, animal and microbial. Brewing industry and pharmaceutical
industry are all need catalyst. The chemical reaction of molecular is
done with less energy in the environment of catalyst.
The amount
of it is small, but the function is large. They are used for catalytic
reactions of polymerization, polycondensation, esterifying, Acetal,
hydrogenation, dehydrogenation, oxidation, reduction, alkylation,
isomerization, etc. However, the catalyst cannot change the
thermodynamic equilibrium. It can only affect the rate of reaction
equilibrium. Speed up reaction called positive catalysts, otherwise it
is negative catalyst. Commonly it refers to positive catalysts.
Such
chemical has become the Centre of polymer synthesis. It not only
determines the speed of chemical reactions, but also affects the
economic efficiency of the production process. It has wide range of
catalysts, which can be formed by one or several substances. Some are
single compound, some are mixtures, some are complex. Commonly used are
metal, metal oxide, sulfide, pH, biological catalysts and so on. OKCHEM
blog updates knowledge and information about chemicals and precise datas
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