Chinese Journal of Catalysis ›› 2014, Vol. 35 ›› Issue (10): 1641-1652.DOI: 10.1016/S1872-2067(14)60193-5

• Review • Previous Articles     Next Articles

A brief review of para-xylene oxidation to terephthalic acid as a model of primary C-H bond activation

Nor Aqilah Mohd Fadzil, Mohd Hasbi Ab. Rahim, Gaanty Pragas Maniam   

  1. Faculty of Industrial Sciences & Technology, Universiti Malaysia Pahang, Lebuhraya Tun Razak, 26300 Gambang Kuantan, Pahang, Malaysi
  • Received:2014-05-20 Revised:2014-07-08 Online:2014-09-28 Published:2014-09-30
  • Supported by:

    This work was supported by Universiti Malaysia Pahang and the Ministry of Education, Malaysia for Exploratory Research Grant Scheme (ERGS) (RDU 120605) and again Ministry of Education, Malaysia support for MyPhD funding aid (Nor Aqilah Mohd Fadzil).

Abstract:

The oxidation of para-xylene to terephthalic acid has been commercialised as the AMOCO process (Co/Mn/Br) that uses a homogeneous catalyst of cobalt and manganese together with a corrosive bromide compound as a promoter. This process is conducted in acidic medium at a high temperature (175-225 ℃). Concerns over environmental and safety issues have driven studies to find milder oxidation reactions of para-xylene. This review discussed past and current progress in the oxidation of para-xylene process. The discussion concentrates on the approach of green chemistry including (1) using heterogeneous catalysts with promising high selectivity and mild reaction condition, (2) application of carbon dioxide as a co-oxidant, and (3) application of alternative promoters. The optimisation of para-xylene oxidation was also outlined.

Key words: Heterogeneous catalyst, Optimisation, Oxidation, para-Xylene, Promoter, Terephthalic acid