Structural properties investigation of different alumina polymorphs (η-, γ-, χ-, θ-, α-Al2O3) using Cr3+ as a luminescent probe

Baronskiy, Mark G.; Tsybulya, S. V.; Kostyukov, Anton I.; Zhuzhgov, Aleksey V.; Снытников, В. Н.

doi:10.1016/j.jlumin.2021.118554

“…Thus, the 4 T 2g level becomes lower in energy than the 2 E g level. 18,19 The second maximum corresponds to the 2 E g → 4 A 2g transition in Cr 3+ ions, which have replaced Al 3+ ions in the crystal lattice of the support and therefore are exposed to a strong field. 19…”

Section: Resultsmentioning

confidence: 99%

Spectroscopy analysis of the active component of chromia-alumina dehydrogenation catalysts

Бекмухамедов

¹

,

Igo

²

,

Tuktarov

³

et al. 2022

New J. Chem.

1

0

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“…α-Al2O3 and γ-Al2O3, alumina polymorphs, were potential 95 materials of interest because they are polar compounds, but not acidic, and thus, may attract Hg II (g) compounds without capturing Hg 0 (Zheng et al, 2019). Alumina polymorphs are stable at high temperatures (Baronskiy et al, 2022), making them ideal for re-use following thermal desorption. α-Al2O3 and γ-Al2O3 differ in thermal stability and specific surface area, and thus may perform differently in terms of capture efficiency and reusability.…”

mentioning

confidence: 99%

Comment on amt-2024-50

2024

0

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“…α-Al2O3 and γ-Al2O3, alumina polymorphs, were potential 95 materials of interest because they are polar compounds, but not acidic, and thus, may attract Hg II (g) compounds without capturing Hg 0 (Zheng et al, 2019). Alumina polymorphs are stable at high temperatures (Baronskiy et al, 2022), making them ideal for re-use following thermal desorption. α-Al2O3 and γ-Al2O3 differ in thermal stability and specific surface area, and thus may perform differently in terms of capture efficiency and reusability.…”

mentioning

confidence: 99%

Alternate materials for the capture and quantification of gaseous oxidized mercury in the atmosphere

Lown,

Dunham-Cheatham,

Lyman

et al. 2024

Preprint

0

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Abstract. Methodologies for identifying atmospheric oxidized mercury (HgII) compounds, including particulate-bound HgII (HgII(p)) and gaseous oxidized mercury (HgII(g)), by mass spectrometry (MS) are currently under development. This method requires preconcentration of HgII for analysis due to high instrument detection limits relative to ambient HgII concentrations. The objective of this work was to identify and test materials for quantitative capture of HgII from the gas phase, and to suggest potential surfaces onto which HgII can be collected, thermally desorbed, and characterized using MS methods. From the literature, several compounds were identified as potential sorbent materials and tested in the laboratory for uptake of gaseous elemental mercury (Hg0) and HgII(g) (permeated from a HgBr2 salt source). Chitosan, α-Al2O3, and γ-Al2O3 demonstrated HgII(g) capture in ambient air laboratory tests, without sorbing Hg0 under the same conditions. When compared to cation exchange membranes (CEM), chitosan captured a comparable quantity of HgII(g), while ≤ 90 % of loaded HgII(g) was recovered from α-Al2O3, and γ-Al2O3. When deployed in the field, the capture efficiency of chitosan decreased compared to CEM, indicating environmental conditions impacted the sorption efficiency of this material. The poor recovery of HgII from the tested materials compared to CEM in the field indicate that further identification and exploration of alternative sorbent materials is required to advance atmospheric mercury chemistry analysis by MS methods.

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Structural properties investigation of different alumina polymorphs (η-, γ-, χ-, θ-, α-Al2O3) using Cr3+ as a luminescent probe

Cited by 11 publications

References 36 publications

Spectroscopy analysis of the active component of chromia-alumina dehydrogenation catalysts

Spectroscopy analysis of the active component of chromia-alumina dehydrogenation catalysts

Comment on amt-2024-50

Alternate materials for the capture and quantification of gaseous oxidized mercury in the atmosphere

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