Non-integer orders in chemical kinetics

Química Nova

Faria, Roberto B.¹  Oliveira, André P.¹  Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil¹ 

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

DOI  :  10.1590/S0100-40422010000600035

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 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】

Unknown