Solid State Science and Technology, Vol. 17, No 2 (2009) 96-102
Corresponding Author: firstname.lastname@example.org
INTERCALATION OF Co-COMPLEX INTO THE LAYERED STRUCTURE
OF VOPO4·2H2O FOR THE PREPARATION OF VANADYL
PYROPHOSPHATE, (VO)2P2O7 CATALYST
Y.H. Taufiq-Yap, S. Matali and M.Z. Hussein
Putra Laboratory for Catalysis Science and Technology,
Department of Chemistry, Faculty of Science, Universiti Putra Malaysia
43400 UPM Serdang, Selangor, Malaysia.
Layered vanadyl phosphate dihydrate, VOPO4·2H2O is one of the precursor to vanadyl pyrophosphate (VPO) catalyst which is the sole catalyst used industrially for the partial
oxidation of n-butane to maleic anhydride. With a basal spacing of 0.74 nm, layered
VOPO4·2H2O was used as the host and Co-complex (Co(acac)2) as a guest The obtained
precursor, VOHPO4·0.5H2O was confirmed by XRD and were activated in a reaction
flow of n-butane/air mixture (0.75% n-butane/air) to form vanadyl pyrophosphate
catalyst ((VO)2P2O7) at 460oC for 18 h. Both catalysts were characterised by using
several methods i.e. X-ray Diffraction (XRD), Braunner Emmer Teller (BET) surface
area and Temperature Programmed Reduction (TPR), Redox titration and Scanning
Electron Microscopy (SEM). Co-complex was succesfully intercalated into the layer and
as proven by XRD with a presence of a new peak appeared at 2θ = 6.8º and another new
peak was also observed at 2θ = 13.5 º. TPR studies of Co intercalated VPO shows a
sharp peak come with larger area (compared to unintercalated catalyst) which correspond
to the removal of oxygen species associated to V4+ phase. Another peak at lower
temperature which corresponds to the oxygen species released from V5+ phase. An
improved of n-butane conversion is expected due to the increment of the active oxygen
species (O-) which responsible to the activation of n-butane. Higher amount of oxygen
linked to V5+ also will contribute to the activity of the Co-intercalated catalyst.
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