Optical spectroscopy of Rh3+ ions in the lanthanum-aluminum oxide systems

Vladimir O. Stoyanovskii, Aleksey A. Vedyagin, Alexander M. Volodin, Roman M. Kenzhin, Yulia N. Bespalko, Pavel E. Plyusnin, Yury V. Shubin

Результат исследований: Материалы для журналаСтатья

5 Цитирования (Scopus)

Выдержка

A series of the Rh-containing samples supported on pure γ-Al2O3, La-doped γ-Al2O3, LaAl11O18 and LaAlO3 was prepared and characterized. Diffusion of Rh3+ ions from the surface of the support into its bulk causing the rapid deactivation of the catalyst in a model reaction of CO oxidation under the prompt thermal aging conditions was shown to be accelerated by a presence of lanthanum. The amount of rhodium disappeared from the surface during the high temperature treatment was estimated by a testing reaction of ethane hydrogenolysis and an electron paramagnetic resonance spectroscopy with spin probe. In order to characterize rhodium ions diffused into the bulk of the support at different calcination temperatures, the optical spectroscopic methods (diffuse reflectance UV–vis and photoluminescence spectroscopies) were applied. Rh3+ ions were shown to be applicable as a luminescence probe to follow the process of their bulk diffusion and localization within the matrix of the support, as well as for the structure identification of the La-containing sites responsible for the alumina thermal stabilization. The obtained data on luminescence of Rh3+ ions indicate that already at 800 °C the oxygen octahedrons corresponding to LaAl11O18 structure are being formed in the local coordination surroundings of isolated La ion in the 4%La2O3-Al2O3 support. It is important to notice that the structures of such kind can be formed in La-doped aluminas only. There are no octahedron positions with sufficient values of the crystal field for the formation of luminescence centers of Rh3+ ions in pure γ-Al2O3.

Язык оригиналаАнглийский
Страницы (с-по)609-617
Число страниц9
ЖурналJournal of Luminescence
Том204
DOI
СостояниеОпубликовано - 1 дек 2018

Отпечаток

lanthanum oxides
Lanthanum
Aluminum Oxide
Spectrum Analysis
aluminum oxides
Ions
Luminescence
spectroscopy
Rhodium
ions
luminescence
rhodium
Hot Temperature
octahedrons
hydrogenolysis
Hydrogenolysis
Temperature
Ethane
Thermal aging
Photoluminescence spectroscopy

ASJC Scopus subject areas

  • Biophysics
  • Atomic and Molecular Physics, and Optics
  • Chemistry(all)
  • Biochemistry
  • Condensed Matter Physics

Цитировать

Stoyanovskii, V. O., Vedyagin, A. A., Volodin, A. M., Kenzhin, R. M., Bespalko, Y. N., Plyusnin, P. E., & Shubin, Y. V. (2018). Optical spectroscopy of Rh3+ ions in the lanthanum-aluminum oxide systems. Journal of Luminescence, 204, 609-617. https://doi.org/10.1016/j.jlumin.2018.08.070

Optical spectroscopy of Rh3+ ions in the lanthanum-aluminum oxide systems. / Stoyanovskii, Vladimir O.; Vedyagin, Aleksey A.; Volodin, Alexander M.; Kenzhin, Roman M.; Bespalko, Yulia N.; Plyusnin, Pavel E.; Shubin, Yury V.

В: Journal of Luminescence, Том 204, 01.12.2018, стр. 609-617.

Результат исследований: Материалы для журналаСтатья

Stoyanovskii, VO, Vedyagin, AA, Volodin, AM, Kenzhin, RM, Bespalko, YN, Plyusnin, PE & Shubin, YV 2018, 'Optical spectroscopy of Rh3+ ions in the lanthanum-aluminum oxide systems', Journal of Luminescence, том. 204, стр. 609-617. https://doi.org/10.1016/j.jlumin.2018.08.070
Stoyanovskii VO, Vedyagin AA, Volodin AM, Kenzhin RM, Bespalko YN, Plyusnin PE и соавт. Optical spectroscopy of Rh3+ ions in the lanthanum-aluminum oxide systems. Journal of Luminescence. 2018 Дек. 1;204:609-617. https://doi.org/10.1016/j.jlumin.2018.08.070
Stoyanovskii, Vladimir O. ; Vedyagin, Aleksey A. ; Volodin, Alexander M. ; Kenzhin, Roman M. ; Bespalko, Yulia N. ; Plyusnin, Pavel E. ; Shubin, Yury V. / Optical spectroscopy of Rh3+ ions in the lanthanum-aluminum oxide systems. В: Journal of Luminescence. 2018 ; Том 204. стр. 609-617.
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title = "Optical spectroscopy of Rh3+ ions in the lanthanum-aluminum oxide systems",
abstract = "A series of the Rh-containing samples supported on pure γ-Al2O3, La-doped γ-Al2O3, LaAl11O18 and LaAlO3 was prepared and characterized. Diffusion of Rh3+ ions from the surface of the support into its bulk causing the rapid deactivation of the catalyst in a model reaction of CO oxidation under the prompt thermal aging conditions was shown to be accelerated by a presence of lanthanum. The amount of rhodium disappeared from the surface during the high temperature treatment was estimated by a testing reaction of ethane hydrogenolysis and an electron paramagnetic resonance spectroscopy with spin probe. In order to characterize rhodium ions diffused into the bulk of the support at different calcination temperatures, the optical spectroscopic methods (diffuse reflectance UV–vis and photoluminescence spectroscopies) were applied. Rh3+ ions were shown to be applicable as a luminescence probe to follow the process of their bulk diffusion and localization within the matrix of the support, as well as for the structure identification of the La-containing sites responsible for the alumina thermal stabilization. The obtained data on luminescence of Rh3+ ions indicate that already at 800 °C the oxygen octahedrons corresponding to LaAl11O18 structure are being formed in the local coordination surroundings of isolated La ion in the 4{\%}La2O3-Al2O3 support. It is important to notice that the structures of such kind can be formed in La-doped aluminas only. There are no octahedron positions with sufficient values of the crystal field for the formation of luminescence centers of Rh3+ ions in pure γ-Al2O3.",
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author = "Stoyanovskii, {Vladimir O.} and Vedyagin, {Aleksey A.} and Volodin, {Alexander M.} and Kenzhin, {Roman M.} and Bespalko, {Yulia N.} and Plyusnin, {Pavel E.} and Shubin, {Yury V.}",
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T1 - Optical spectroscopy of Rh3+ ions in the lanthanum-aluminum oxide systems

AU - Stoyanovskii, Vladimir O.

AU - Vedyagin, Aleksey A.

AU - Volodin, Alexander M.

AU - Kenzhin, Roman M.

AU - Bespalko, Yulia N.

AU - Plyusnin, Pavel E.

AU - Shubin, Yury V.

PY - 2018/12/1

Y1 - 2018/12/1

N2 - A series of the Rh-containing samples supported on pure γ-Al2O3, La-doped γ-Al2O3, LaAl11O18 and LaAlO3 was prepared and characterized. Diffusion of Rh3+ ions from the surface of the support into its bulk causing the rapid deactivation of the catalyst in a model reaction of CO oxidation under the prompt thermal aging conditions was shown to be accelerated by a presence of lanthanum. The amount of rhodium disappeared from the surface during the high temperature treatment was estimated by a testing reaction of ethane hydrogenolysis and an electron paramagnetic resonance spectroscopy with spin probe. In order to characterize rhodium ions diffused into the bulk of the support at different calcination temperatures, the optical spectroscopic methods (diffuse reflectance UV–vis and photoluminescence spectroscopies) were applied. Rh3+ ions were shown to be applicable as a luminescence probe to follow the process of their bulk diffusion and localization within the matrix of the support, as well as for the structure identification of the La-containing sites responsible for the alumina thermal stabilization. The obtained data on luminescence of Rh3+ ions indicate that already at 800 °C the oxygen octahedrons corresponding to LaAl11O18 structure are being formed in the local coordination surroundings of isolated La ion in the 4%La2O3-Al2O3 support. It is important to notice that the structures of such kind can be formed in La-doped aluminas only. There are no octahedron positions with sufficient values of the crystal field for the formation of luminescence centers of Rh3+ ions in pure γ-Al2O3.

AB - A series of the Rh-containing samples supported on pure γ-Al2O3, La-doped γ-Al2O3, LaAl11O18 and LaAlO3 was prepared and characterized. Diffusion of Rh3+ ions from the surface of the support into its bulk causing the rapid deactivation of the catalyst in a model reaction of CO oxidation under the prompt thermal aging conditions was shown to be accelerated by a presence of lanthanum. The amount of rhodium disappeared from the surface during the high temperature treatment was estimated by a testing reaction of ethane hydrogenolysis and an electron paramagnetic resonance spectroscopy with spin probe. In order to characterize rhodium ions diffused into the bulk of the support at different calcination temperatures, the optical spectroscopic methods (diffuse reflectance UV–vis and photoluminescence spectroscopies) were applied. Rh3+ ions were shown to be applicable as a luminescence probe to follow the process of their bulk diffusion and localization within the matrix of the support, as well as for the structure identification of the La-containing sites responsible for the alumina thermal stabilization. The obtained data on luminescence of Rh3+ ions indicate that already at 800 °C the oxygen octahedrons corresponding to LaAl11O18 structure are being formed in the local coordination surroundings of isolated La ion in the 4%La2O3-Al2O3 support. It is important to notice that the structures of such kind can be formed in La-doped aluminas only. There are no octahedron positions with sufficient values of the crystal field for the formation of luminescence centers of Rh3+ ions in pure γ-Al2O3.

KW - La-doped alumina

KW - Lanthanum aluminates

KW - Photoluminescence

KW - Prompt thermal aging

KW - Rhodium diffusion

KW - Stability

KW - UV–vis spectroscopy

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JO - Journal of Luminescence

JF - Journal of Luminescence

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