Chinese Journal of Applied Chemistry ›› 2016, Vol. 33 ›› Issue (10): 1161-1167.DOI: 10.11944/j.issn.1000-0518.2016.10.160004

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Industrial Packing γ-Al2O3 Catalyzed Oxidation of 1,2,4-Trimethylbenzene to 2,3,5-Trimethybenzoquinone

ZHANG Tianyongabc*(),WANG Mengyinga,LI Binac*(),WU Wubina,LIU Qiana   

  1. aTianjin Key Laboratory of Applied Catalysis Science and Technology,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300354,China
    bCollaborative Innovation Center of Chemical Science and Engineering(Tianjin),Tianjin 300354,China
    cTianjin Engineering Research Center of Functional Fine Chemicals,Tianjin 300354,China
  • Received:2016-01-04 Accepted:2016-05-13 Published:2016-10-08 Online:2016-10-08
  • Contact: ZHANG Tianyong,LI Bin
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21276187), Natural Science Foundation of Tianjin(No.16JCYBJC20800), Doctoral Foundation of Ministry of Education(No.20110032120011)

Abstract:

2,3,5-Trimethylbenzoquinone(TMBQ) was synthesized by one-step catalytic oxidation of 1,2,4-trimethylbenzene(TMB) with industrial packing γ-alumina as catalyst, acetic acid as solvent, and 30% H2O2 as oxidant. The effects of catalyst amount, oxidant dosage, reaction temperature and reaction time were investigated. 21.3% conversion of TMB, 16.0% yield of TMBQ, and 75.2% selectivity were obained under optimal conditions:m(γ-Al2O3)/m(TMB)=0.005, m(30%H2O2)/m(TMB)=2.5, reaction 2 h at 80 ℃. The catalyst's properties were characterized by SEM, XRD, FTIR and BET, indicating γ-Al2O3's crystallinity is the key factor to catalytic activity. With pore structure, large specific surface area, uneven particle distribution, irregular lamellar structure, packing γ-Al2O3 is cheap, readily available and has bright prospects.

Key words: trimethylbenzene, trimethylbenzoquinone, catalytic oxidation, alumina