Tuning the surface composition of novel metal vanadates and its effect on the catalytic performance

Naresh, Dhachapally; Kalevaru, V. Narayana; Radnik, Jörg; Martin, Andreas

doi:10.1039/c1cc12117k

Cited by 22 publications

(23 citation statements)

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“…The conversion of MP (X-MP) reached almost 100% over most of the MVs when the reaction temperature window was tuned in the range from 320 to 460˝C in every case except BiVO 4 , which has shown only ca. 75% conversion of MP at >440˝C [21]. In contrast, the total X-MP is already reached at much lower temperature (i.e., 340˝C) over the AlVO 4 solid [21].…”

Section: Resultsmentioning

confidence: 99%

“…We have also previously explored the effect of reaction temperature on the catalytic performance of MP to CP for all solids mentioned above [21]. The conversion of MP (X-MP) reached almost 100% over most of the MVs when the reaction temperature window was tuned in the range from 320 to 460 °C in every case except BiVO4, which has shown only ca.…”

Section: Resultsmentioning

confidence: 99%

“…In our previous investigations, we have examined the effect of various metals (Al, Fe, Cr, Nb, La, Bi) in metal vanadate (MVs) catalysts (e.g., AlVO4, FeVO4, CrVO4, NbVO5, LaVO4, and BiVO4) with constant metal-to-vanadium molar ratio (i.e., 1:1) and tested their potentiality towards the ammoxidation of MP to CP [21,22]. We have also previously explored the effect of reaction temperature on the catalytic performance of MP to CP for all solids mentioned above [21].…”

Section: Resultsmentioning

confidence: 99%

“…Recently, we have studied the properties of various metal vanadates (e.g., AlVO 4 , FeVO 4 , CrVO 4 , NbVO 5 , LaVO 4 , and BiVO 4 ) as a new class of catalytic active materials. Some of these solids revealed improved yields for CP [21,22]. Besides CP, pyrazine (Py), pyrazinamide (PyA), CO and CO 2 were observed as by-products.…”

Section: Introductionmentioning

confidence: 99%

“…It has been observed previously that the nature of metal in metal vanadate has shown clear influence on the catalytic performance [21,24]. Very recently, the near-surface region and the outermost surface layer of such vanadates were studied by X-ray Photoelectron Spectroscopy (XPS) and Low-Energy Ion Scattering (LEIS) [25].…”

Section: Introductionmentioning

confidence: 99%

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Catalytic Performance of Lanthanum Vanadate Catalysts in Ammoxidation of 2-Methylpyrazine

Kalevaru

Naresh²,

Martin

2016

Catalysts

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Abstract:The influence of reaction conditions on the catalytic performance of lanthanum vanadate (La 0.1 V 0.9 O x ) catalyst in the ammoxidation of 2-methylpyrazine (MP) to 2-cyanopyarazine (CP) has been investigated. This novel catalytic material exhibited remarkably good performance with very high space-time-yields (STY) of CP. The reaction parameters such as the effect of temperature, gas hourly space velocity (GHSV) and all other reaction variables (e.g., NH 3 , air, and MP feed rates) on the catalytic performance were explored and optimized. For example, an increase in MP feed rate from 2 to >16 mmol/h led to decreased conversion of MP but increased the STY of CP significantly. Optimal performance was achieved when the reaction temperature was 420˝C and the molar ratio of 2-MP, ammonia, air, H 2 O and N 2 in the feed gas was set to 1:7:26:13:22. Under these optimal reaction conditions, the catalyst showed a MP conversion of~100%, CP selectivity of 86%, and STY of >500 g CP /(kg cat¨h ). On the other hand, the formation of pyrazine (Py) as a by-product was found to be high when the NH 3 :MP ratio was lower at increased contact time. This suggests possible differences in the reaction mechanism pathways with respect to feed composition over La 0.1 V 0.9 O x catalysts.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Catalytic Performance of Lanthanum Vanadate Catalysts in Ammoxidation of 2-Methylpyrazine

Kalevaru

Naresh²,

Martin

2016

Catalysts

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Investigation of BiVO₄ structure variations on the dichlorotoluene ammoxidation performance

Huang

2020

J Chinese Chemical Soc

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In this study, BiVO 4 synthesized by hydrothermal and calcination methods were explored as catalysts in the ammoxidation of dichlorotoluenes to shed light on the structure-reactivity correlations. The BiVO 4 samples were characterized by X-ray diffraction (XRD), temperature-programmed reduction (TPR), Brunauer-Emmett-Teller (BET), and UV-Vis spectrophotometry. The results showed that the catalytic activity of BiVO 4 greatly relied on the structure variations. The hydrothermal prepared BiVO 4 exhibited better catalytic activities as a consequence of its greater structure deformation, with maximum yields of 73.1, 72.2, and 70.8% for 3,4-, 2,4-and 2,6-dichlorobenzonitrles, respectively.

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Process Development and DFT‐Assisted Mechanism of the Vapour Phase Ammoxidation of 2,6‐Dichlorotoluene to 2,6‐Dichlorobenzonitrile over the V₂O₅/γ‐Al₂O₃ Catalyst

et al. 2019

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Ammoxidation of 2,6‐dichlorotoluene (2,6‐DCLT) to 2,6‐dichlorobenzonitrile (2,6‐DCLBN) over V2O5/γ‐Al2O3 catalyst has been carried out in a fixed bed reactor. A maximum conversion of 96% of (2,6‐DCLT) and 79% yield to 2,6‐dichlorobenzonitrile have been obtained at a temperature of 425 °C, Air : 2,6‐DCLT mole ratio of 22 : 1 and NH3 : 2,6‐DCLT mole ratio of 11 : 1. A DFT theory computations have been performed with the objective of finding a mechanism of the reaction, activation energy and transition state for different reactions. Abstraction of C−H bond with an activation energy of 64.60 kcal mol−1 was found to be rate determining step. A new approach has been suggested for the reoxidation of the catalyst which supports reoxidation of every step associated with dehydration of species during the reaction. This finding is a contrary of the previous studies which assume reoxidation of the catalyst at the end of all reactions. Rapid reoxidation of the catalyst surface to release water is found to be the driving force for all reactions involving the cleavage of C−H or N−H bonds.

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Tuning the surface composition of novel metal vanadates and its effect on the catalytic performance

Cited by 22 publications

References 21 publications

Catalytic Performance of Lanthanum Vanadate Catalysts in Ammoxidation of 2-Methylpyrazine

Catalytic Performance of Lanthanum Vanadate Catalysts in Ammoxidation of 2-Methylpyrazine

Investigation of BiVO₄ structure variations on the dichlorotoluene ammoxidation performance

Process Development and DFT‐Assisted Mechanism of the Vapour Phase Ammoxidation of 2,6‐Dichlorotoluene to 2,6‐Dichlorobenzonitrile over the V₂O₅/γ‐Al₂O₃ Catalyst

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Tuning the surface composition of novel metal vanadates and its effect on the catalytic performance

Cited by 22 publications

References 21 publications

Catalytic Performance of Lanthanum Vanadate Catalysts in Ammoxidation of 2-Methylpyrazine

Catalytic Performance of Lanthanum Vanadate Catalysts in Ammoxidation of 2-Methylpyrazine

Investigation of BiVO4 structure variations on the dichlorotoluene ammoxidation performance

Process Development and DFT‐Assisted Mechanism of the Vapour Phase Ammoxidation of 2,6‐Dichlorotoluene to 2,6‐Dichlorobenzonitrile over the V2O5/γ‐Al2O3 Catalyst

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Investigation of BiVO₄ structure variations on the dichlorotoluene ammoxidation performance

Process Development and DFT‐Assisted Mechanism of the Vapour Phase Ammoxidation of 2,6‐Dichlorotoluene to 2,6‐Dichlorobenzonitrile over the V₂O₅/γ‐Al₂O₃ Catalyst