SnO2–V2O5-based catalysts. Nature of surface species and their activity in o-xylene oxidation

Cavani, Fabrizio; Trifirò, Ferruccio; Bartolini, Andrea; Ghisletti, Danila; Nalli, Massimo; Santucci, A.

doi:10.1039/ft9969204321

Cited by 15 publications

(6 citation statements)

References 59 publications

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“…In particular, vanadium was identified as V 4+ and V 5+ , manganese as Mn 3+ and Mn 4+ , cobalt as Co 2+ and Co 3+ , oxidation state. The results of the deconvolution of the corresponding spectra (binding energies, BE) are shown in table 2, in accordance with those reported in literature [14][15][16]. Interestingly, in Sb-doped SnO 2, antimony species were in two distinct chemical state: Sb 3+ and Sb 5+ [17].…”

Section: Xps Studies Dopants (V Mn Co)supporting

confidence: 89%

Effect of the dopant on the structural and hyperfine parameters of Sn_0.95M_0.05O₂ nanoparticles (M: V, Mn, Fe, Co)

Bilovol¹,

Ferrari²,

Saccone³

et al. 2019

Mater. Res. Express

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Section: Xps Studies Dopants (V Mn Co)supporting

confidence: 89%

Effect of the dopant on the structural and hyperfine parameters of Sn_0.95M_0.05O₂ nanoparticles (M: V, Mn, Fe, Co)

Bilovol¹,

Ferrari²,

Saccone³

et al. 2019

Mater. Res. Express

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“…Then, the oxidation of propylene, ethylene, propane and CO was investigated [175]. Throughout the years, several other reactions have been investigated: for instance, ethane oxidative dehydrogenation [176], oxidation of o-xylene [177] and 2-propanol [178], Beckmann rearrangement of cyclohexanone oxime to ε-caprolactam [179]. Analogously to TiO 2 -V 2 O 5 , such varied catalytic activity seems attractive for potential gas-sensing properties, despite SnO 2 -V 2 O 5 , overall, does not result as a very popular catalyst.…”

Section: Semiconducting Oxide-supported Catalystsmentioning

confidence: 99%

How Chemoresistive Sensors Can Learn from Heterogeneous Catalysis. Hints, Issues, and Perspectives

et al. 2021

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The connection between heterogeneous catalysis and chemoresistive sensors is emerging more and more clearly, as concerns the well-known case of supported noble metals nanoparticles. On the other hand, it appears that a clear connection has not been set up yet for metal oxide catalysts. In particular, the catalytic properties of several different oxides hold the promise for specifically designed gas sensors in terms of selectivity towards given classes of analytes. In this review, several well-known metal oxide catalysts will be considered by first exposing solidly established catalytic properties that emerge from related literature perusal. On this basis, existing gas-sensing applications will be discussed and related, when possible, with the obtained catalysis results. Then, further potential sensing applications will be proposed based on the affinity of the catalytic pathways and possible sensing pathways. It will appear that dialogue with heterogeneous catalysis may help workers in chemoresistive sensors to design new systems and to gain remarkable insight into the existing sensing properties, in particular by applying the approaches and techniques typical of catalysis. However, several divergence points will appear between metal oxide catalysis and gas-sensing. Nevertheless, it will be pointed out how such divergences just push to a closer exchange between the two fields by using the catalysis knowledge as a toolbox for investigating the sensing mechanisms.

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“…UV−vis−NIR diffuse reflectance spectroscopy (DRS) has increasingly been applied to investigate the structures of V(V)-containing oxide compounds/mixed oxides, ,2a,− V(V)-containing zeolites, − ,19a and supported vanadia catalysts 2b,20-41 due to the ligand-to-metal charge transfer (LMCT) transitions of V(V) in the 20000−48000 cm -1 region . The local structures of the V(V) cations in these materials are often associated with the band positions of the LMCT transitions.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Surface Structures of Supported Vanadium Oxide Catalysts by UV−vis−NIR Diffuse Reflectance Spectroscopy

2000

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UV−vis−NIR diffuse reflectance spectroscopy (DRS) was applied to study the local structures of V(V) cations on various oxide supports (Al2O3, ZrO2 TiO2, Nb2O5, CeO2, and SiO2) under hydrated and dehydrated conditions. The edge energy (E g) of the LMCT transitions of V(V) cations was used to elucidate the local structures of V(V) cations, and a correlation between the edge energy and the number of the covalent V−O−V bonds (CVB) around the central V(V) cations was established based on some V(V) reference compounds/oxides. For TiO2, Nb2O5, and CeO2 supported vanadia catalysts, the strong support absorption in the same region as the V(V) cations prevents a reliable determination of the local structure of the surface vanadium oxide species by either the LMCT band position or the edge energy. For Al2O3, ZrO2, and SiO2 supported vanadia catalysts, the average CVB number derived from the edge energy allows the assignment of the possible structure of the surface vanadium oxide species, which is a strong function of the support, environmental conditions, and vanadia surface density. The DRS results provide reliable information and new insights into the structural characteristics of the surface vanadium oxide species on these oxide supports under different environmental conditions.

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SnO₂–V₂O₅-based catalysts. Nature of surface species and their activity in o-xylene oxidation

Cited by 15 publications

References 59 publications

Effect of the dopant on the structural and hyperfine parameters of Sn_0.95M_0.05O₂ nanoparticles (M: V, Mn, Fe, Co)

Effect of the dopant on the structural and hyperfine parameters of Sn_0.95M_0.05O₂ nanoparticles (M: V, Mn, Fe, Co)

How Chemoresistive Sensors Can Learn from Heterogeneous Catalysis. Hints, Issues, and Perspectives

Investigation of Surface Structures of Supported Vanadium Oxide Catalysts by UV−vis−NIR Diffuse Reflectance Spectroscopy

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SnO2–V2O5-based catalysts. Nature of surface species and their activity in o-xylene oxidation

Cited by 15 publications

References 59 publications

Effect of the dopant on the structural and hyperfine parameters of Sn0.95M0.05O2 nanoparticles (M: V, Mn, Fe, Co)

Effect of the dopant on the structural and hyperfine parameters of Sn0.95M0.05O2 nanoparticles (M: V, Mn, Fe, Co)

How Chemoresistive Sensors Can Learn from Heterogeneous Catalysis. Hints, Issues, and Perspectives

Investigation of Surface Structures of Supported Vanadium Oxide Catalysts by UV−vis−NIR Diffuse Reflectance Spectroscopy

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SnO₂–V₂O₅-based catalysts. Nature of surface species and their activity in o-xylene oxidation

Effect of the dopant on the structural and hyperfine parameters of Sn_0.95M_0.05O₂ nanoparticles (M: V, Mn, Fe, Co)

Effect of the dopant on the structural and hyperfine parameters of Sn_0.95M_0.05O₂ nanoparticles (M: V, Mn, Fe, Co)