Acid-catalyzed oxidation of carboxymethyl cellulose polysaccharide by chromic acid in aqueous perchlorate solutions. A kinetics study

作者：Hassan Refat M^*; Ahmed Saddek M; Fawzy Ahmed; Abdel Kader Doaa A; Ikeda Yasuhisa; Takagi Hideo D

来源：Catalysis Communications, 2010, 11(7): 611-615.

DOI：10.1016/j.catcom.2010.01.006

• Catalysis
• Carboxymethyl cellulose
• Polysaccharides
• Chromic acid
• Oxidation
• Kinetics

The acid-catalysis of chromic acid oxidation of carboxymethyl cellulose (CMC) as a polysaccharide in aqueous perchlorate solutions at a constant ionic strength of 2.0 mol dm(-3) have been investigated spectrophotometrically. The experimental results showed first-order kinetics in chromic acid and fractional first-order dependence with respect to [CMC]. A kinetic evidence for the formation of 1:1 complex between chromic acid and CMC was revealed. The hydrogen ion dependence of the reaction rates showed that the oxidation process is acid-catalyzed. Induced polymerization of acrylonitrile indicated that the oxidation process proceeds by free-radical mechanism. The kinetic parameters have been evaluated and a tentative reaction mechanism consistent with the kinetic results is suggested.

• 出版日期2010-3-10