Oxidation of Toluene and o-Xylene on Ti Phosphate-Supported Vanadium Oxide Catalysts

Val, S. del; Granados, M. Lòpez; Fierro, J.L.G.; Santamaría‐González, J.; Jiménez-López, A.

doi:10.1006/jcat.1999.2652

Cited by 18 publications

(1 citation statement)

References 40 publications

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“…Reaction of o -Xylene Oxidation. Catalytic activity measurements were carried out in a plug-flow glass fixed-bed reactor heated by means of a cylindrical oven in a previously described apparatus . The reactor catalyst load consisted of 0.25 g of catalyst diluted seven times in silicon carbide (0.42−0.50 mm).…”

Section: Methodsmentioning

confidence: 99%

Bulk and Surface Structures of V₂O₅/ZrO₂ Systems and Their Relevance for o-Xylene Oxidation

et al. 2002

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Zirconia-supported vanadium oxide systems, with V2O5 loadings ranging from V/Zr ) 0.033-0.270 atom ratios (0.2-2 monolayers), were prepared by impregnation of a porous ZrO2 substrate with ammonium metavanadate solutions. The surface structures of air-calcined samples were elucidated by Raman and X-ray photoelectron spectroscopic techniques and thermal desorption methods. Some insight into how the bulk structures of these materials developed upon thermal treatment was derived from the X-ray diffraction patterns and temperature-programmed reduction. At low V content, surface-dispersed vanadium oxide species were formed, which produced the transformation of the ZrO2 support from the tetragonal phase into the monoclinic one. At higher vanadium oxide contents, a solid-state reaction between V2O5 and ZrO2 occurred, with subsequent formation of the ZrV2O7 phase, this being the major V-containing phase. The reactivity of these surface structures was examined by looking at their performance for the oxidation of o-xylene to phthalic anhydride. Activity tests indicated that surface vanadium oxide species were more active for the oxidation of o-xylene but had a lower selectivity to phthalic anhydride.

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Section: Methodsmentioning

confidence: 99%

Bulk and Surface Structures of V₂O₅/ZrO₂ Systems and Their Relevance for o-Xylene Oxidation

et al. 2002

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α-TiP-Supported Vanadium Oxide Catalysts: Influence of Calcination Pretreatments on Structure and Performance for o-Xylene Oxidation

Val

Granados

Fierro

et al. 2001

Journal of Catalysis

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Studies on Preparation, Characterization and Ammoxidation Functionality of Zirconium Phosphate-Supported V2O5 Catalysts

et al. 2006

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Zirconium pyrophosphate (ZrP 2 O 7 ) was synthesized from zirconyl chloride and phosphoric acid. A series of ZrP 2 O 7 -supported V 2 O 5 catalysts, with the oxide loading ranging from 2 to 8 wt.%, was prepared by wet impregnation method. These catalysts were characterized by various techniques like X-ray diffraction, BET surface area, pore size distribution, FT-IR spectroscopy, acidity measurements and X-ray photoelectron spectroscopy. Their catalytic functionality was evaluated in the ammoxidation of 2-methyl pyrazine (MP) to 2-cyano pyrazine (CP). The V 2 O 5 /ZrP 2 O 7 catalysts are found to be highly active and selective. FT-IR profiles of used catalysts indicate the interaction of ammonia with vanadia. The physico-chemical properties of the catalysts are correlated with their activity and nitrile selectivity.KEY WORDS: vanadia catalysts; zirconium pyrophosphate; ammoxidation of 2-methyl pyrazine; vanadium ammonium complex.

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Oxidation of Toluene and o-Xylene on Ti Phosphate-Supported Vanadium Oxide Catalysts

Cited by 18 publications

References 40 publications

Bulk and Surface Structures of V₂O₅/ZrO₂ Systems and Their Relevance for o-Xylene Oxidation

Bulk and Surface Structures of V₂O₅/ZrO₂ Systems and Their Relevance for o-Xylene Oxidation

α-TiP-Supported Vanadium Oxide Catalysts: Influence of Calcination Pretreatments on Structure and Performance for o-Xylene Oxidation

Studies on Preparation, Characterization and Ammoxidation Functionality of Zirconium Phosphate-Supported V2O5 Catalysts

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Oxidation of Toluene and o-Xylene on Ti Phosphate-Supported Vanadium Oxide Catalysts

Cited by 18 publications

References 40 publications

Bulk and Surface Structures of V2O5/ZrO2 Systems and Their Relevance for o-Xylene Oxidation

Bulk and Surface Structures of V2O5/ZrO2 Systems and Their Relevance for o-Xylene Oxidation

α-TiP-Supported Vanadium Oxide Catalysts: Influence of Calcination Pretreatments on Structure and Performance for o-Xylene Oxidation

Studies on Preparation, Characterization and Ammoxidation Functionality of Zirconium Phosphate-Supported V2O5 Catalysts

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Bulk and Surface Structures of V₂O₅/ZrO₂ Systems and Their Relevance for o-Xylene Oxidation

Bulk and Surface Structures of V₂O₅/ZrO₂ Systems and Their Relevance for o-Xylene Oxidation