Chin.J.Chem.Eng. ›› 2018, Vol. 26 ›› Issue (5): 1064-1070.doi: 10.1016/j.cjche.2018.02.019

• Catalysis, Kinetics and Reaction Engineering • Previous Articles     Next Articles

Catalyst-free and solvent-free oxidation of cycloalkanes (C5-C8) with molecular oxygen: Determination of autoxidation temperature and product distribution

Haimin Shen, Yan Wang, Jinhui Deng, Long Zhang, Yuanbin She   

  1. State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
  • Received:2017-10-26 Revised:2018-01-20 Online:2018-05-28 Published:2018-06-29
  • Contact: Yuanbin She,E-mail
  • Supported by:

    Supported by the National Natural Science Foundation of China (Grant No. 21476270, 21306176, 21776259, 21276006) and Scientific Research Launching Foundation of Zhejiang University of Technology (Grant No. G2817101103).

Abstract: Autoxidation of cycloalkanes (C5-C8) with molecular oxygen under catalyst-free and solvent-free conditions was conducted systematically for the first time, focusing on the autoxidation temperature and product distribution. The autoxidation of cyclopentane, cyclohexane, cycloheptane and cyclooctane occurs at 120℃, 130℃, 120℃, and 105℃ respectively, with obvious oxidized products formation. At 140℃, 145℃, 130℃ and 125℃, acceptable yields of the oxidized products could be obtained for them, and the oxidized product distributions were investigated in detail. The autoxidation of cycloalkanes follows the pseudo-first-order kinetic model and the apparent activation energies (Ea) for the autoxidation of cyclopentane and cyclohexane are 159.76 kJ·mol-1 and 86.75 kJ·mol-1 respectively. This study can act as an important reference in screen of suitable reaction temperature and comparison of the performance of various catalysts in the catalytic oxidation of cycloalkanes in the attempt to enhance the oxidized product selectivity.

Key words: Cycloalkane, Oxidation, Autoxidation temperature, Product distribution