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Table 1 Catalytic oxidation of cyclohexane over VAlPO4 berlinite and VAPO-5 molecular sieve

From: The highly selective oxidation of cyclohexane to cyclohexanone and cyclohexanol over VAlPO4 berlinite by oxygen under atmospheric pressure

Catalyst χ (%)a Si (%)c [V, Co and/or Mn] (ppb)d χ (%)b
Ol One Others V Co Mn
AlPO4 0 0 0 0 0 0 0 0
VAlPO4 5.9 69.2 28.6 1.8 11 0.04
VAPO-5 6.3 60.5 35.0 1.0 390 0.8
V2O5 2.1 51.3 44.6 4.1 610 1.1
VAlPO 4 e 5.7 68.7 28.9 2.4 15 0.09
CoAPO4 [22] 3.8 91.3 7.4 1.3 24 0.03
MnAPO4 [22] 4.1 93.6 5.6 0.8 0 0.01
CoMnAPO4 [22] 5.2 60.7 33.7 0.5 15 8 0.04
  1. Cyclohexane 100 mL, VAlPO4 berlinite catalyst 5 mg, acetic acid solvent 40 mL, O2 pressure 0.1 MPa, 348 K, 4 h
  2. a,b χ: Cyclohexane conversion in normal and leaching test, respectively; c Si: Ol, cyclohexanol; One, cyclohexanone; Others, C4–C6 diacids and their esters; d Concentrations of metal ion leaked into solution; e VAlPO4 berlinite catalyst recycled for the fifth time as a catalyst in the reaction batch