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Kinetics and mechanism of maleic acid hydroxylation by hydrogen peroxide. Part I: Formal kinetic studies by immobilized catalysis in a pseudo‐homogeneous system
Author(s) -
Oludipe John O.,
Iyuke Sunny E.,
Aderemi Benjamin O.
Publication year - 1995
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.280630209
Subject(s) - catalysis , chemistry , hydrogen peroxide , hydroxylation , yield (engineering) , maleic acid , sorption , selectivity , amberlite , inorganic chemistry , organic chemistry , polymer , materials science , copolymer , adsorption , metallurgy , enzyme
Formal kinetic studies of the epoxidation and hydroxylation of maleic acid by hydrogen peroxide (H 2 O 2 ) have been carried out in the presence of a molybdenum salt, as catalyst, immobilized on Amberlite IRA‐400 polymer resin in the chloride form. Immobilization of the catalyst on the resin was by a sorption process. Hydroxylation by immobilized catalysis afforded higher H 2 O 2 selectivity and increased product yield in excess of 85%. Analysis of kinetic results shows that the reaction in the pseudo‐homogeneous system follows the typical pseudo‐zero order dependence on H 2 O 2 concentration and is first order with respect to maleic acid concentration. However, the rate model developed for the immobilized catalyst fits the experimental data smoothly and parameter estimation using the Lineweaver–Burk plot fulfils the kinetic consistency tests without additional mathematical manipulation. The problem of activity and stability of the present catalyst was also investigated.