Catalytic Properties of Silver Vanadium Phosphates in n‐Butane Oxidation – Considerations on the Impact of the [VxOy] Substructure

Karpov, Andrey; Dobner, Cornelia-Katharina; Glaum, Robert; Schunk, Stephan A.; Rosowski, Frank

doi:10.1002/cite.201100096

Cited by 7 publications

(7 citation statements)

References 43 publications

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“…Similarly, the catalytic activity and selectivity of various, more recently characterized polynary vanadium(IV) phosphates containing different transition metals do not reach the conventional vanadyl pyrophosphate catalyst 11. However, a mixed valence silver vanadium(IV/V) oxide phosphate with the empirical composition Ag 2 V IV, V P 1.6 O 7+ δ (0 ≤ δ ≤ 0.5) showed promising catalytic performance in the gas phase oxidation of n ‐butane to maleic anhydride 12…”

Section: Introductionmentioning

confidence: 99%

Solid Solution Formation between Vanadium(V) and Tungsten(V) Oxide Phosphate

Roy¹,

Glaum²,

Abdullin³

et al. 2014

Zeitschrift anorg allge chemie

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The solid solutions (V 1-x W x )OPO 4 with β-VOPO 4 structure type (0.0 Յ x Յ 0.01) and α II -VOPO 4 structure type (0.04 Յ x Յ 0.26) were obtained from mixtures of V V OPO 4 and W V OPO 4 by conventional solid state reactions and by solution combustion synthesis. Single crystals of up to 3 mm edge length were obtained by chemical vapor transport (CVT) (800 Ǟ 700°C, Cl 2 as a transporting agent). Single crystal structure refinements of crystals at x = 0.10 [a = 6.0503(2) Å, c = 4.3618(4) Å, R 1 = 0.021, wR 2 = 0.058, 21 parameters, 344 independent reflections] and x = 0.26 [a = 6.0979(2) Å, c = 4.2995(1) Å, R 1 = 0.030, wR 2 = 0.081, 21 parameters, 346 independent

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Section: Introductionmentioning

confidence: 99%

Solid Solution Formation between Vanadium(V) and Tungsten(V) Oxide Phosphate

Roy¹,

Glaum²,

Abdullin³

et al. 2014

Zeitschrift anorg allge chemie

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“…It provides evidence for the chemical and structural flexibility of such layers, which are claimed to be present in metastable phases with chemical compositions in between (V IV O) 2 P 2 O 7 and V V OPO 4 . By comparison of XRPD pattern, it is concluded that Ag 6 (V IV O) 2 (PO 4 ) 2 (P 2 O 7 ) is one of the crystalline phases contained in an apparently heterogeneous silver vanadyl phosphate mixture with the empirical composition Ag 2 V IV,V P 1.6 O 7+ δ (0 ≤ δ < 0.5) which showed promising catalyst activity and selectivity in the gas phase oxidation of n ‐butane to maleic anhydride.…”

Section: Discussionmentioning

confidence: 87%

“…Ag 2 (V IV O)(P 2 O 7 ) and Ag 2 (V V O 2 )(PO 4 ) with vanadium(IV) and vanadium(V) as well as mixed‐valent Ag(V IV O)(V V O)(PO 4 ) 2 have been tested as catalyst material for the selective oxidation of n ‐butane. The first was completely inactive, the latter two lead to total oxidation of the alkane . Only recently, a silver vanadyl phosphate with the empirical composition Ag 2 V IV,V P 1.6 O 7+ δ (0 ≤ δ < 0.5) and hitherto unknown structure was observed to show promising catalyst activity and selectivity in the gas phase oxidation of n ‐butane to MA …”

Section: Introductionmentioning

confidence: 99%

“…The first was completely inactive, the latter two lead to total oxidation of the alkane . Only recently, a silver vanadyl phosphate with the empirical composition Ag 2 V IV,V P 1.6 O 7+ δ (0 ≤ δ < 0.5) and hitherto unknown structure was observed to show promising catalyst activity and selectivity in the gas phase oxidation of n ‐butane to MA …”

Section: Introductionmentioning

confidence: 99%

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Silver Vanadyl(IV) ortho‐Pyrophosphate: Synthesis, Crystal Structure, and Characterization of the (V≡O)²⁺ Group

Wittich

NejatyJahromy

Abdullin

et al. 2018

Zeitschrift anorg allge chemie

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Ag 6 (V IV O) 2 (PO 4 ) 2 (P 2 O 7 ) was obtained by reaction of Ag 3 PO 4 and (VO) 2 P 2 O 7 (sealed ampoule, 550°C, 3 d). The crystal structure of the new mixed ortho-pyrophosphate was determined from X-ray single-crystal data [Pnma, Z = 4, a = 12.759(3) Å, b = 17.340(4) Å, c = 6.418(1) Å, R 1 = 0.071, wR 2 = 0.184 for 3174 unique reflections with F o Ͼ 4σ(F o ), 141 variables]. Ag + ions are located in between layers [(V IV O) 2 (PO 4 ) 2 (P 2 O 7 )] 6-. Equilibrium relations of the * Prof. Dr. R. Glaum E-Mail: rglaum@uni-bonn.de [a]424 new phosphate to neighboring phases were determined. The electronic structure of the (V IV ϵO) 2+ group was investigated by polarized electronic absorption spectroscopy (ν 1a = 9450 cm -1 , ν 1b = 9950 cm -1 , ν 2 = 14750 cm -1 ), EPR spectroscopy [X-and Q-band, powder and single crystal, orthorhombic crystal g-tensor with g 1 = 1.9445(3), g 2 = 1.9521(3), g 3 = 1.9695(3)], and magnetic measurements (powder, μ exp /μ B = 1.71, Θ p = -1.7 K).

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“…In battery cathodes for energy storage, high ion mobility is explained by the local bonding environment of a multivalent ion (19). V 4+ ion-related motifs and the connections between these motifs are found to be important determining factors for the selective oxidation of hydrocarbons (20)(21)(22). The presence of MO 4 tetrahedra (M as Si or Al) can be used to identify the most promising synthetic candidates from the pool of hypothetical zeolites (23).…”

Section: Introductionmentioning

confidence: 99%

Structure motif–centric learning framework for inorganic crystalline systems

et al. 2021

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Incorporation of physical principles in a machine learning (ML) architecture is a fundamental step toward the continued development of artificial intelligence for inorganic materials. As inspired by the Pauling’s rule, we propose that structure motifs in inorganic crystals can serve as a central input to a machine learning framework. We demonstrated that the presence of structure motifs and their connections in a large set of crystalline compounds can be converted into unique vector representations using an unsupervised learning algorithm. To demonstrate the use of structure motif information, a motif-centric learning framework is created by combining motif information with the atom-based graph neural networks to form an atom-motif dual graph network (AMDNet), which is more accurate in predicting the electronic structures of metal oxides such as bandgaps. The work illustrates the route toward fundamental design of graph neural network learning architecture for complex materials by incorporating beyond-atom physical principles.

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Catalytic Properties of Silver Vanadium Phosphates in n‐Butane Oxidation – Considerations on the Impact of the [V_xO_y] Substructure

Cited by 7 publications

References 43 publications

Solid Solution Formation between Vanadium(V) and Tungsten(V) Oxide Phosphate

Solid Solution Formation between Vanadium(V) and Tungsten(V) Oxide Phosphate

Silver Vanadyl(IV) ortho‐Pyrophosphate: Synthesis, Crystal Structure, and Characterization of the (V≡O)²⁺ Group

Structure motif–centric learning framework for inorganic crystalline systems

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Catalytic Properties of Silver Vanadium Phosphates in n‐Butane Oxidation – Considerations on the Impact of the [VxOy] Substructure

Cited by 7 publications

References 43 publications

Solid Solution Formation between Vanadium(V) and ­Tungs­ten(V) Oxide Phosphate

Solid Solution Formation between Vanadium(V) and ­Tungs­ten(V) Oxide Phosphate

Silver Vanadyl(IV) ortho‐Pyrophosphate: Synthesis, Crystal Structure, and Characterization of the (V≡O)2+ Group

Structure motif–centric learning framework for inorganic crystalline systems

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Product

Resources

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Catalytic Properties of Silver Vanadium Phosphates in n‐Butane Oxidation – Considerations on the Impact of the [V_xO_y] Substructure

Solid Solution Formation between Vanadium(V) and Tungsten(V) Oxide Phosphate

Solid Solution Formation between Vanadium(V) and Tungsten(V) Oxide Phosphate

Silver Vanadyl(IV) ortho‐Pyrophosphate: Synthesis, Crystal Structure, and Characterization of the (V≡O)²⁺ Group