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Decavanadate-intercalated Ni–Al hydrotalcites as precursors of mixed oxides for the oxidative dehydrogenation of propane

Paper ID Volume ID Publish Year Pages File Format Full-Text
55152 47042 2012 8 PDF Available
Title
Decavanadate-intercalated Ni–Al hydrotalcites as precursors of mixed oxides for the oxidative dehydrogenation of propane
Abstract

Two nickel–aluminum hydrotalcite type precursors were synthesized with molar ratio Ni/Al = 3, using hydroxyl and carbonate as compensation anions. These precursors were intercalated by 30% (theoretical) decavanadate anion. The catalysts were obtained after calcination at 550 °C and their performance was evaluated in propane oxidative dehydrogenation at 400 °C using space velocities of 100, 150, 200 and 400 ml g−1 min−1 under conditions of oxygen deficiency and oxygen excess. Catalysts derived from nickel–aluminum-hydroxyl precursors attained an excellent performance under oxygen deficiency conditions promoting high propene selectivity and conversion. Under oxygen excess conditions the catalyst was more active but its selectivity was lower. Vanadium-containing catalysts showed improved selectivity under this operation condition. The formation of the hydrotalcite phase in precursors and mixed oxides in the catalysts was evidenced by X-ray diffraction (XRD). Analyses of textural and reduction properties were carried-out with nitrogen adsorption and temperature programmed reduction techniques respectively. Structural studies were performed by X-ray absorption spectroscopy for materials that showed best performance in the oxidative dehydrogenation reaction.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (166 K)Download as PowerPoint slideHighlights► Ni–V mixed oxides catalysts from Ni–Al hydrotalcite type precursors with decavanadate. ► Decavanadate incorporation depends on anion type in hydrotalcite-precursor. ► Partial aluminum substitution in hydrotalcite layers. ► Catalysts with pyro- and ortho-vanadate of nickel and nickel oxide. ► Hydroxyl anion precursor produced the catalyst with better selectivity to propene.

Keywords
Nickel; Hydrotalcite; Oxidative dehydrogenation of propane; EXAFS
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Decavanadate-intercalated Ni–Al hydrotalcites as precursors of mixed oxides for the oxidative dehydrogenation of propane
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 192, Issue 1, 30 September 2012, Pages 36–43
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
100% Money Back Guarantee
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