Selective Oxidation of Hydrogen Sulfdde on A Sodium Promoted Dion Oxide on Silica Catalyst

Terorde, Robert J. A. M.; Jong, M.; Crombag, M.J.D.; Dillen, A.J. van; Geus, J.W.

doi:10.1016/s0167-2991(08)63484-9

Cited by 14 publications

(5 citation statements)

References 5 publications

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“…Moreover, the formation of FeS 2 species can also cause the decrease in the sulfur selectivity. Fortunately, the incorporation of sodium can improve the sulfur selectivity of Fe 2 O 3 /SiO 2 greatly, 84 because adding basic sodium affects SiO 2 by destroying the acid sites and suppressing formation of sulfur radicals. Simultaneously, an increase in the calcination temperature can enhance the stability of the catalyst…”

Section: +mentioning

confidence: 99%

H₂S-Selective Catalytic Oxidation: Catalysts and Processes

et al. 2015

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ABSTRACT:The most widely used catalysts and processes for H 2 S-selective catalytic oxidation are overviewed in this review. Two kinds of catalysts have been investigated intensively: carbon-based catalysts (active carbon catalyst, carbon nanotube catalyst, and carbon nanofiber catalyst), metal oxide-based catalysts (metal oxide catalyst, oxidesupported catalyst, and clay-supported catalyst). Among them, carbon-based catalysts are utilized mainly in discontinuous processes at relatively low temperatures, whereas metal oxide catalysts are the most widely used in practice. However, the reaction temperature is relatively high. Fortunately, a MgAlVO catalyst derived from LDH materials and intercalated claysupported catalysts exhibit excellent catalytic activities at relatively lower temperatures. According to various studies, the catalytic behaviors mainly obey the Mars−van Krevelen mechanism; however, the catalyst deactivation mechanism differs, depending on the catalyst. In practice, the mobil direct oxidation process (MODOP), super-Claus and Euro-Claus processes were developed for H 2 S-selective catalytic oxidation. Nevertheless, MODOP has to proceed under water-free conditions. The super-Claus process can operate in up to 30% water content. The Euro-Claus process is a modified version of the super-Claus process, which was developed to eliminate recovery losses of escaped SO 2 .

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Section: +mentioning

confidence: 99%

H₂S-Selective Catalytic Oxidation: Catalysts and Processes

et al. 2015

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“…Nevertheless, the increase of reaction temperature caused a decrease of sulfur selectivity because of the formation of FeS 2 and SO 2 induced by the reaction between sulfur radical and oxygen. To address this issue, 3 wt % Na was incorporated into the Fe 2 O 3 /SiO 2 catalyst, which greatly improved the sulfur selectivity of the catalyst . This could be attributed to the destruction of acid sites and the suppression of sulfur radical formation by adding basic Na into a SiO 2 support.…”

Section: Selective Oxidation Of H2smentioning

confidence: 99%

Advances in Resources Recovery of H₂S: A Review of Desulfurization Processes and Catalysts

Zheng,

Lei,

Wang

et al. 2023

ACS Catal.

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Hydrogen sulfide (H 2 S) is a notorious and lethal gas widely generated in human economic activities and natural occurrences. The growing demand for pollution control makes it vital for the development of efficient processes to remove and convert H 2 S into high-valued products. As such, diversified technologies have been extensively explored, including H 2 S splitting, selective oxidation of H 2 S, and simultaneous conversion of H 2 S and CO 2 . In this review, the state-of-the-art processes for H 2 S conversion and utilization are reviewed. The potentials of various value-added products from H 2 S utilization, such as H 2 , syngas, COS, CH 3 SH, and other sulfur-containing fine chemicals are elucidated in detail. Notably, the traditional and emerging materials for H 2 S removal, mainly including metal oxide catalysts and carbon-based materials are also overviewed in this review. In addition, the catalytic mechanisms for these desulfurization reactions are also briefly discussed. Lastly, perspectives are given on the viability and technological gaps for each technology and corresponding catalysts.

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“…Other work has examined unsupported iron oxide and iron sulfide for the conversion of H 2 S to elemental sulfur using O 2 . Although many supported iron oxides (e.g., iron on Al 2 O 3 or SiO 2 ), − mixed-metal iron oxides, , and aqueous iron-based redox systems have proven to be effective for promoting H 2 S conversion to elemental sulfur, unsupported iron oxide has not been used industrially. Fe 2 O 3 is known to react with H 2 S to produce Fe 2 S 3 , as well as FeS 2 , FeS, and Fe 3 S 4 , depending on the temperature maintained during the reaction. , Mechanistically, the direct sulfidation of bulk α-Fe 2 O 3 to iron sulfides has been shown to occur without preceding reduction steps to Fe 3 O 4 or FeO .…”

Section: Introductionmentioning

confidence: 99%

High-Pressure H₂S Conversion and SO₂ Production over γ-Al₂O₃/Fe_χS(OH) in Liquid Sulfur

Shields

Clark

2008

Ind. Eng. Chem. Res.

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A stainless steel autoclave was used to investigate high-pressure catalytic H 2 S conversion to sulfur in a liquidsulfur medium. Using the fundamental chemistry developed in earlier low-pressure conversion studies, the objective of this work was to investigate the use of high pressures for increasing overall H 2 S conversion to elemental sulfur. Using 1.55% H 2 S (balance N 2 ), the H 2 S scavenging activity of fresh FeO(OH) was found to increase with increasing operating pressures. Reaction of 1.55% H 2 S with 0.80% O 2 (balance N 2 ) over Fe χ S(OH) resulted in 87% H 2 S conversion to elemental sulfur at a reactor operating pressure of 6984 kPa (1000 psig). Incorporating dual-catalyst reaction conditions (γ-Al 2 O 3 /Fe χ S(OH)), 99.6% H 2 S conversion to elemental sulfur was attained using a feed gas containing 1.33% H 2 S/1.16% O 2 (balance N 2 ) and a reactor operating pressure of 1813 kPa (250 psig). It is suggested that SO 2 is generated by the iron catalyst and that H 2 S conversion occurs by the reaction of H 2 S with SO 2 , primarily over γ-Al 2 O 3 . A concurrent SO 2 kinetics investigation demonstrated very high SO 2 production activity over Fe χ S(OH) as compared to γ-Al 2 O 3 . Finally, the dual-catalyst regime proved capable of maintaining high H 2 S conversions to elemental sulfur under higher H 2 S-content feed-gas conditions. Overall, higher operating pressures proved to be effective for increasing the total H 2 S conversion to elemental sulfur.

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Selective Oxidation of Hydrogen Sulfdde on A Sodium Promoted Dion Oxide on Silica Catalyst

Cited by 14 publications

References 5 publications

H₂S-Selective Catalytic Oxidation: Catalysts and Processes

H₂S-Selective Catalytic Oxidation: Catalysts and Processes

Advances in Resources Recovery of H₂S: A Review of Desulfurization Processes and Catalysts

High-Pressure H₂S Conversion and SO₂ Production over γ-Al₂O₃/Fe_χS(OH) in Liquid Sulfur

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Selective Oxidation of Hydrogen Sulfdde on A Sodium Promoted Dion Oxide on Silica Catalyst

Cited by 14 publications

References 5 publications

H2S-Selective Catalytic Oxidation: Catalysts and Processes

H2S-Selective Catalytic Oxidation: Catalysts and Processes

Advances in Resources Recovery of H2S: A Review of Desulfurization Processes and Catalysts

High-Pressure H2S Conversion and SO2 Production over γ-Al2O3/FeχS(OH) in Liquid Sulfur

Contact Info

Product

Resources

About

H₂S-Selective Catalytic Oxidation: Catalysts and Processes

H₂S-Selective Catalytic Oxidation: Catalysts and Processes

Advances in Resources Recovery of H₂S: A Review of Desulfurization Processes and Catalysts

High-Pressure H₂S Conversion and SO₂ Production over γ-Al₂O₃/Fe_χS(OH) in Liquid Sulfur