Titanium-substituted vanadium and iron antimonates

The Effect of Metal–Cation Vacancies on Vanadium Antimonate Surface Properties. A Theoretical Study

“…The bulk was modeled with a trirutile supercell (see Figure ) containing the most probable metal–oxygen combinations as reported from powder diffraction studies . The calculated lattice parameters for this VSbO 4 trirutile-type structure: a = b = 4.708 Å and c ′ = 9.286 Å (where c ′ = 3 c , c = 3.095 Å), are in good agreement with the corresponding experimental XRD data …”

“…13 The calculated lattice parameters for this VSbO 4 trirutile-type structure: a = b = 4.708 Å and c′ = 9.286 Å (where c′ = 3c, c = 3.095 Å), are in good agreement with the corresponding experimental XRD data. 34 The stoichiometric VSbO 4 (110) surface was generated by cutting the bulk solid with the ideal (110) plane and retaining an extra O-layer.…”

The Effect of Metal–Cation Vacancies on Vanadium Antimonate Surface Properties. A Theoretical Study

“…The bulk was modeled with a trirutile supercell (see Figure ) containing the most probable metal–oxygen combinations as reported from powder diffraction studies . The calculated lattice parameters for this VSbO 4 trirutile-type structure: a = b = 4.708 Å and c ′ = 9.286 Å (where c ′ = 3 c , c = 3.095 Å), are in good agreement with the corresponding experimental XRD data …”

“…13 The calculated lattice parameters for this VSbO 4 trirutile-type structure: a = b = 4.708 Å and c′ = 9.286 Å (where c′ = 3c, c = 3.095 Å), are in good agreement with the corresponding experimental XRD data. 34 The stoichiometric VSbO 4 (110) surface was generated by cutting the bulk solid with the ideal (110) plane and retaining an extra O-layer.…”

Effect of titanium-doping on the properties of vanadium antimonate catalysts

“…The X-ray powder diffraction data indicate the rutile-related VSb 1−x Ti x O 4 phase (where x = 0, 0.1, 0.2 and 0.4) to be similar to that formerly described as VSbO 4 containing vanadium(III) and antimony(V) [12,17]. The absence of lines associated with titanium(IV) oxide is related to the incorporation of titanium within the rutile phase.…”

“…The catalysts were prepared according to the method published by Berry et al [17], by mechanical mixing of pure vanadium(V) oxide, antimony(III) oxide and titanium(IV) oxide (Mallinckrodt reagent grade). The amounts of each oxide in the sample corresponded to those necessary to obtain a stoichiometric solid of composition VSb 1−x Ti x O 4 (with x = 0, 0.1, 0.2 and 0.4).…”

“…The introduction of foreign ions in order to modify these ratios could be a key for improving the catalytic performance. In this sense, Berry et al [17] prepared titanium-substituted vanadium antimonates and studied their structural properties. The X-ray diffraction (XRD) patterns showed a contraction in the lattice parameters as Sb 5+ is replaced by Ti 4+ , with concomitant loss of oxygen and oxidation of V(III) to V(IV), as an indication of the incorporation of Ti within the rutile-related phase.…”

The Effect of Metal–Cation Vacancies on Vanadium Antimonate Surface Properties. A Theoretical Study

“…The bulk was modeled with a trirutile supercell (see Figure ) containing the most probable metal–oxygen combinations as reported from powder diffraction studies . The calculated lattice parameters for this VSbO 4 trirutile-type structure: a = b = 4.708 Å and c ′ = 9.286 Å (where c ′ = 3 c , c = 3.095 Å), are in good agreement with the corresponding experimental XRD data …”

“…13 The calculated lattice parameters for this VSbO 4 trirutile-type structure: a = b = 4.708 Å and c′ = 9.286 Å (where c′ = 3c, c = 3.095 Å), are in good agreement with the corresponding experimental XRD data. 34 The stoichiometric VSbO 4 (110) surface was generated by cutting the bulk solid with the ideal (110) plane and retaining an extra O-layer.…”

Effect of titanium-doping on the properties of vanadium antimonate catalysts

“…The X-ray powder diffraction data indicate the rutile-related VSb 1−x Ti x O 4 phase (where x = 0, 0.1, 0.2 and 0.4) to be similar to that formerly described as VSbO 4 containing vanadium(III) and antimony(V) [12,17]. The absence of lines associated with titanium(IV) oxide is related to the incorporation of titanium within the rutile phase.…”

“…The catalysts were prepared according to the method published by Berry et al [17], by mechanical mixing of pure vanadium(V) oxide, antimony(III) oxide and titanium(IV) oxide (Mallinckrodt reagent grade). The amounts of each oxide in the sample corresponded to those necessary to obtain a stoichiometric solid of composition VSb 1−x Ti x O 4 (with x = 0, 0.1, 0.2 and 0.4).…”

“…The introduction of foreign ions in order to modify these ratios could be a key for improving the catalytic performance. In this sense, Berry et al [17] prepared titanium-substituted vanadium antimonates and studied their structural properties. The X-ray diffraction (XRD) patterns showed a contraction in the lattice parameters as Sb 5+ is replaced by Ti 4+ , with concomitant loss of oxygen and oxidation of V(III) to V(IV), as an indication of the incorporation of Ti within the rutile-related phase.…”

The Effect of Metal–Cation Vacancies on Vanadium Antimonate Surface Properties. A Theoretical Study

“…The bulk was modeled with a trirutile supercell (see Figure ) containing the most probable metal–oxygen combinations as reported from powder diffraction studies . The calculated lattice parameters for this VSbO 4 trirutile-type structure: a = b = 4.708 Å and c ′ = 9.286 Å (where c ′ = 3 c , c = 3.095 Å), are in good agreement with the corresponding experimental XRD data …”

“…13 The calculated lattice parameters for this VSbO 4 trirutile-type structure: a = b = 4.708 Å and c′ = 9.286 Å (where c′ = 3c, c = 3.095 Å), are in good agreement with the corresponding experimental XRD data. 34 The stoichiometric VSbO 4 (110) surface was generated by cutting the bulk solid with the ideal (110) plane and retaining an extra O-layer.…”

Effect of titanium-doping on the properties of vanadium antimonate catalysts

“…The X-ray powder diffraction data indicate the rutile-related VSb 1−x Ti x O 4 phase (where x = 0, 0.1, 0.2 and 0.4) to be similar to that formerly described as VSbO 4 containing vanadium(III) and antimony(V) [12,17]. The absence of lines associated with titanium(IV) oxide is related to the incorporation of titanium within the rutile phase.…”

“…The catalysts were prepared according to the method published by Berry et al [17], by mechanical mixing of pure vanadium(V) oxide, antimony(III) oxide and titanium(IV) oxide (Mallinckrodt reagent grade). The amounts of each oxide in the sample corresponded to those necessary to obtain a stoichiometric solid of composition VSb 1−x Ti x O 4 (with x = 0, 0.1, 0.2 and 0.4).…”

“…The introduction of foreign ions in order to modify these ratios could be a key for improving the catalytic performance. In this sense, Berry et al [17] prepared titanium-substituted vanadium antimonates and studied their structural properties. The X-ray diffraction (XRD) patterns showed a contraction in the lattice parameters as Sb 5+ is replaced by Ti 4+ , with concomitant loss of oxygen and oxidation of V(III) to V(IV), as an indication of the incorporation of Ti within the rutile-related phase.…”