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The oxidative dehydrogenation of n-hexane over Ni–Mo–O catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
42454 45926 2009 8 PDF Available
Title
The oxidative dehydrogenation of n-hexane over Ni–Mo–O catalysts
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.

Graphical abstractCatalysts consisting 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 were investigated in the oxidation/oxidative dehydrogenation of n-hexane. Pure β-NiMoO4 gave the highest selectivity to hexenes, predominantly 1-hexene.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
NiMoO4; n-Hexane; Oxidation; In situ characterization
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The oxidative dehydrogenation of n-hexane over Ni–Mo–O catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 361, Issues 1–2, 20 June 2009, Pages 57–64
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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