Title of article :
The oxidative dehydrogenation of n-hexane over Ni–Mo–O catalysts Original Research Article
Author/Authors :
Bavani Pillay، نويسنده , , Mfanuwenkosi R. Mathebula، نويسنده , , Holger B. Friedrich، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2009
Pages :
8
From page :
57
To page :
64
Abstract :
The effect of chemical composition on nickel–molybdenum catalysts in the oxidative dehydrogenation of n-hexane was studied. The catalysts consisted of the following phases: nickel oxide, molybdenum trioxide, nickel molybdate (α-NiMoO4 and β-NiMoO4) and a solid solution of nickel in a lattice of nickel molybdate. Characterization of the catalysts was carried out using ICP-OES, BET, XRD, FTIR, SEM, TPR and XPS techniques. The effect of phase composition of the catalysts on their catalytic activity and selectivity to the products obtained in the temperature range 300–500 °C was also studied. The most selective catalyst for the synthesis of hexenes was the pure β-NiMoO4, which gave 25% selectivity to 1-hexene and 10% selectivity to 2-hexenes and 3-hexenes at 9% conversion. The pure phases NiO and MoO3, although active in hexane ODH, showed poor selectivity to hexenes, particularly to 1-hexene at comparable conversions suggesting that they are not responsible for the catalytic activity of the NiO–MoO3 system. The pure β-phase was more selective towards the hexenes than the α-phase with the difference in the molybdenum coordination believed to be the reason for the different activities and selectivities of the two modifications of NiMoO4. The α-phase with MoO3 was more active, suggesting that a synergetic effect plays an important role in modifying catalytic activity.
Keywords :
NiMoO4 , n-Hexane , Oxidation , In situ characterization
Journal title :
Applied Catalysis A:General
Serial Year :
2009
Journal title :
Applied Catalysis A:General
Record number :
1156121
Link To Document :
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