Cerium fluoride supported V2O5 catalysts: physico-chemical characterization and 3-picoline ammoxidation activity

Narayana, K.V.; Raju, B. David; Masthan, S. Khaja; Rao, V. Venkat; Rao, P. Kanta; Martin, Andreas

doi:10.1016/j.molcata.2004.02.033

Cited by 21 publications

(3 citation statements)

References 39 publications

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“…Such a reaction is also considered to be an economical and environmentally friendly process because the air plays directly as an effective oxidant and the only resultant byproduct is water in an ideal case . Numerous reports have proven that the supported vanadium mixed oxide system functions as the suitable catalyst for vapor phase ammoxidation of alkyl aromatics. − Meanwhile, several reaction kinetics studies have also been conducted to deepen the understanding of the ammoxidation reaction based on the vanadium oxide catalysts. − …”

Section: Introductionmentioning

confidence: 99%

Kinetic Study of Meta-Xylene Ammoxidation Reaction over a Commercial V–Cr Mixed Oxide Catalyst

Feng

et al. 2021

Ind. Eng. Chem. Res.

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The reaction behavior of meta-xylene ammoxidation on a commercial V−Cr mixed oxide catalyst (NC-IV) were studied in a fixed bed reactor, by kinetic modeling of experimental data of designed conditions. Specially, the oxidation of NH 3 to N 2 was also involved in the kinetic model, which is vital in the ammoxidation reaction. The catalyst showed monoclinic CrVO 4 phase and spherical morphology with an average particle diameter of 45 μm. Nonlinear regression analysis of the evaluation data has been employed to determine the rate constant and the order of reaction. The results indicated that m-xylene, oxygen, and ammonia share similar kinetic reaction orders for the production of isophthalonitrile (IPN) and m-tolunitrile (MTN), while the NH 3 oxidation reaction shows the highest reaction order, indicating that the partial pressure of ammonia and O 2 requires a precise control. The calculation of activation energies implies that selective ammoxidation to IPN has the highest activation energy (170.6 kJ mol −1 ), which is higher than MTN formation (117.5 kJ mol −1 ). The oxidation of m-xylene to CO 2 has slightly higher activation energy (122.9 kJ mol −1 ) than MTN production, implying the production of mtolunitrile is the dominant reaction under high reaction WHSV. The NH 3 oxidation shows the lowest activation energy (58.2 kJ mol −1 ) than the m-xylene participated reactions demonstrating a relatively easy NH 3 oxidation. These kinetic analyses are useful for a better understanding of the catalytic ammoxidation reaction of alkyl substituted aromatics over V−Cr mixed oxide catalysts.

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Section: Introductionmentioning

confidence: 99%

Kinetic Study of Meta-Xylene Ammoxidation Reaction over a Commercial V–Cr Mixed Oxide Catalyst

Feng

et al. 2021

Ind. Eng. Chem. Res.

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“…The ammoxidation reaction has been facilitated by various heterogeneous catalyst systems, mostly consisting of transition metal oxides as the main catalyst components. Among them, vanadium-containing oxides are preferentially used as bulk [2,3], supported [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21], or multicomponent catalysts [22,23] for the ammoxidation of methyl aromatics or heteroaromatics.…”

Section: Introductionmentioning

confidence: 99%

Ammoxidation of 3-Picoline over V2O5/TiO2 Catalysts: Effects of TiO2 Supports on the Catalytic Performance

Zhang

Chen

Zhong

et al. 2011

AMR

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A series of V2O5/TiO2catalysts were prepared by wet impregnation, and these prepared catalysts were characterized by XRD, N2 adsorption-desorption, H2-TPR, and TEM techniques and used in the selective ammoxidation of 3-picoline to 3-cyanopyridine. The effects of TiO2 supports on the catalytic properties of the resulting catalysts for the ammoxidation of 3-picoline to 3-cyanopyridine were investigated in detail. It is found that the V5+/V4+ transformation during ammoxidation is more favorable than the V5+/V3+ transformation for the selective ammoxidation of 3-picoline to 3-cyanopyridine. The V2O5/TiO2catalysts prepared from the nanosized TiO2particles as supports show a high activity for the direct oxidation of 3-picoline by air, resulting Subscript text Subscript textin a low selectivity for 3-cyanopyridine. This could be due to the fact that the active species vanadium oxides could be only supported on the external surface of the nano-sized TiO2particles with very minor contact area, leading to the weak interactions between active species and support.

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“…In addition, Ce-V mixed oxides have been shown to be a good combination for transparency and ion-storage capacity. Furthermore, such solids are good catalytic systems, for example in ammoxidation reactions (Narayana et al 2004). Vanadium pentoxide (V 2 O 5 ) can react with CeO 2 at high temperature to form vanadium orthovanadate, CeVO 4 (Chen 2006).…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Synthesis and Properties of Ternary V–Cu–Ce Oxides of Composition V_xCu_xCe_{1 – 2x}O₂

Attipa

Theocharis

2009

Adsorption Science & Technology

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A co-precipitation method has been used to prepare ternary mixed oxides based on ceria with the general formula V x Cu x Ce 1 -2x O 2 , where x was varied between 0.05 and 0.45. The structural and surface properties as well as the morphologies of the solids were examined by thermogravimetric analysis, differential scanning calorimetry, X-ray diffraction studies, nitrogen adsorption isotherms, Fourier-transform infrared spectroscopy and scanning electron microscopy.For samples where the vanadium and copper content was low (x ≤ 0.3), the surface area increased and the pore distribution shifted towards the micropore range. The sample V 0.05 Cu 0.05 Ce 0.9 O 2 exhibited the highest surface area and the sample V 0.45 Cu 0.45 Ce 0.1 O 2 the smallest. The samples were calcined within the temperature range 473-1073 K. When the vanadium content was increased to x ≥ 0.3 and the calcination temperature set at 673 K, a phase with composition CeVO 4 was detected via X-ray diffractometry, in addition to a V 2 O 5 and a CeO 2 phase. The FT-IR spectra confirmed the above results.

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Cerium fluoride supported V2O5 catalysts: physico-chemical characterization and 3-picoline ammoxidation activity

Cited by 21 publications

References 39 publications

Kinetic Study of Meta-Xylene Ammoxidation Reaction over a Commercial V–Cr Mixed Oxide Catalyst

Kinetic Study of Meta-Xylene Ammoxidation Reaction over a Commercial V–Cr Mixed Oxide Catalyst

Ammoxidation of 3-Picoline over V<sub>2</sub>O<sub>5</sub>/TiO<sub>2</sub> Catalysts: Effects of TiO<sub>2</sub> Supports on the Catalytic Performance

Investigation of the Synthesis and Properties of Ternary V–Cu–Ce Oxides of Composition V_xCu_xCe_{1 – 2x}O₂

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Cerium fluoride supported V2O5 catalysts: physico-chemical characterization and 3-picoline ammoxidation activity

Cited by 21 publications

References 39 publications

Kinetic Study of Meta-Xylene Ammoxidation Reaction over a Commercial V–Cr Mixed Oxide Catalyst

Kinetic Study of Meta-Xylene Ammoxidation Reaction over a Commercial V–Cr Mixed Oxide Catalyst

Ammoxidation of 3-Picoline over V<sub>2</sub>O<sub>5</sub>/TiO<sub>2</sub> Catalysts: Effects of TiO<sub>2</sub> Supports on the Catalytic Performance

Investigation of the Synthesis and Properties of Ternary V–Cu–Ce Oxides of Composition VxCuxCe1 – 2xO2

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Investigation of the Synthesis and Properties of Ternary V–Cu–Ce Oxides of Composition V_xCu_xCe_{1 – 2x}O₂