Exploring N-Containing Compound Catalyst for H2S Selective Oxidation: Case Study of TaON and Ta3N5

Huang, Huiting; Yang, Shuai; Hu, Wenjian; Zhang, Lili; Feng, Jianyong; Jiang, Lilong; Yu, Tao; Li, Zhaosheng; Zou, Zhigang

doi:10.1007/s10562-020-03430-6

Cited by 4 publications

(3 citation statements)

References 51 publications

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“…The Raman spectra of as‐synthesized

{\rm {Ta}}_3{\rm {N}}_5

fibers are given in Figure 2B. The characteristic peaks at 126, 262, 397, 514, 593, 744, 816, and 901

{\rm {cm}}^{-1}

are in agreement with the experimental studies 10,31,32 . The presence of oxygen impurity can contribute to the broadness of some of the peaks 33 .…”

Section: Resultssupporting

confidence: 78%

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Thermal decomposition of oxygen‐containing Ta3N5${\rm {Ta}}_3{\rm {N}}_5$

Moharana,

Ghosh,

Dasgupta

et al. 2024

J Am Ceram Soc.

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Transition metal nitrides, especially tantalum nitrides, are pivotal for applications in extreme environments demanding excellent mechanical properties and thermodynamic stability. Among them, ‐TaN, a high‐pressure polymorph of tantalum nitride with its exceptional bulk modulus (362 GPa) and hardness (31.7 GPa) promises to have many technological uses. Another nitride, , has gained importance as a photocatalyst for water splitting using visible light. The Ta–N phase diagram indicates that the thermal decomposition of pure leads to the formation of ‐TaN. However, usually has some amount of oxygen as an impurity mainly due to its synthesis route. We found that the ‐TaN phase, which is usually observed at high pressures, is formed during the thermal decomposition of oxygen containing . The presence of ‐TaN is verified using several experimental techniques such as X‐ray diffraction, Raman spectra, high‐angle annular dark field scanning transmission electron microscopy (STEM‐HAADF), and electron energy loss spectroscopy (EELS). Elemental distribution analyzed through energy dispersion X‐ray spectroscopy (XEDS) in STEM reveals about 7 at.% of oxygen in ‐TaN. First‐principle calculations are performed to examine the thermodynamic stability of oxygen substituted ‐TaN and pure ‐TaN via formation enthalpies, elastic constants, and phonon dispersion calculations. The computational studies confirm that oxygen in ‐TaN enhances its thermodynamic stability. The calculated electron localization functions establish the bonding characteristics between Ta, N, and O, confirming the same.

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“…The Raman spectra of as‐synthesized

{\rm {Ta}}_3{\rm {N}}_5

fibers are given in Figure 2B. The characteristic peaks at 126, 262, 397, 514, 593, 744, 816, and 901

{\rm {cm}}^{-1}

are in agreement with the experimental studies 10,31,32 . The presence of oxygen impurity can contribute to the broadness of some of the peaks 33 .…”

Section: Resultssupporting

confidence: 78%

“…The characteristic peaks at 126, 262, 397, 514, 593, 744, 816, and 901 cm −1 are in agreement with the experimental studies. 10,31,32 The presence of oxygen impurity can contribute to the broadness of some of the peaks. The peak at 664 cm −1 corresponds to the stretching of the Ta-O bond.…”

Section: Characterization Of 𝐓𝐚 𝟑 𝐍mentioning

confidence: 99%

Thermal decomposition of oxygen‐containing Ta3N5${\rm {Ta}}_3{\rm {N}}_5$

Moharana,

Ghosh,

Dasgupta

et al. 2024

J Am Ceram Soc.

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“…Natural gas processing/utilizing processes, petroleum refining processes, and coal chemistry produce H 2 S-containing waste gas [1][2][3].The removal of H 2 S from industry waste gas is crucial as H 2 S is a toxic and corrosive gas, leading to severe pollution and equipment/pipeline corrosion [4]. Numerous efforts have been conducted to remove H 2 S and the most widely used technology is called the Claus process, which recovers elemental sulfur from H 2 S-containing gas [5,6]. However, due to thermodynamic limitations, the Claus process cannot achieve 100% H 2 S conversion, leaving 2-5% unconverted H 2 S gas remaining after the treatment [7].…”

Section: Introductionmentioning

confidence: 99%

Oxygen Vacancy-Mediated Selective H2S Oxidation over Co-Doped LaFexCo1−xO3 Perovskite

Xun

Gao

et al. 2022

Catalysts

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Compared to the Claus process, selective H2S catalytic oxidation to sulfur is a promising reaction, as it is not subject to thermodynamic limitations and could theoretically achieve ~100% H2S conversion to sulfur. In this study, we investigated the effects of Co and Fe co-doping in ABO3 perovskite on H2S selective catalytic oxidation. A series of LaFexCo1−xO3 (x = 0, 0.2, 0.4, 0.6, 0.8, 1.0) perovskites were synthesized by the sol-gel method. Compared to LaFeO3 and LaCoO3, co-doped LaFexCo1−xO3 significantly improved the H2S conversion and sulfur selectivity at a lower reaction temperature. Nearly 100% sulfur yield was achieved on LaFe0.4Co0.6O3 under 220 °C with exceptional catalyst stability (above 95% sulfur yield after 77 h). The catalysts were characterized by XRD, BET, FTIR, XPS, and H2-TPR. The characterization results showed that the structure of LaFexCo1−xO3 changed from the rhombic phase of LaCoO3 to the cubic phase of LaFeO3 with Fe substitution. Doping with appropriate iron (x = 0.4) facilitates the reduction of Co ions in the catalyst, thereby promoting the H2S selective oxidation. This study demonstrates a promising approach for low-temperature H2S combustion with ~100% sulfur yield.

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