Ordens não inteiras em cinética química

Química Nova

André P. Oliveira¹  Roberto B. Faria¹ 

[1] ,Universidade Federal do Rio de Janeiro Instituto de Química Rio de Janeiro RJ ,Brasil

关键词: chemical kinetics;    non-integer orders;    homogeneous catalysis;   

DOI  :  10.1590/S0100-40422010000600035

来源: SciELO

【 摘 要 】

Starting from zero-, first-, and second-order integrated laws for chemical kinetics, some cases are shown which produce fractional orders. Taking the Michaelis-Menten mechanism as a first example, it is shown that substrate order can go from 1 to zero, depending on relative concentration of enzyme and substrate. Using other examples which show fractional orders higher than one and even negative (inhibition), it is shown that the presence of an equilibrium before or parallel to the rate determining step can be the reason for fractional orders, which is an indication of a more complex mechanism.

【 授权许可】

CC BY-NC   
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