Vanadium-containing catalysts for the selective oxidation of H2S to elemental sulfur in the presence of excess water

Shin, Moon Young; Park, Dae Won; Chung, Jong Shik

doi:10.1016/s0920-5861(00)00485-5

Cited by 28 publications

(12 citation statements)

References 10 publications

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“…Thus, TiO 2 -based catalyst deactivation is mainly due to deposition of elemental sulfur. 81 (2) Vanadium-based catalyst deactivation is caused primarily by the slower oxidation rate of V 4+ by oxygen compared with the reduction rate of V 5+ by H 2 S. 82,83,97 Otherwise, the formation of VOSO 4 65 and crystalline V 2 O 5 90−94 also…”

Section: Acs Catalysismentioning

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: Acs Catalysismentioning

confidence: 99%

H₂S-Selective Catalytic Oxidation: Catalysts and Processes

et al. 2015

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“…Tel. : +86-22-27891878; Fax: +86-22-27401451 E-mail: wgjnet@126.com SO 2 reduction with CO as reducing agent has been reported using several types of catalysts including alumina-supported transition metals, perovskite and mixed oxides [3]. However, few studies have been reported on catalytic activity for decreasing COS in pre-sulfurized process in the presence of oxygen.…”

Section: Introductionmentioning

confidence: 99%

Study on the catalytic reduction mechanism of SO2 by CO over doped copper perovskite catalyst in presence of oxygen

Wang

Qin

et al. 2006

React Kinet Catal Lett

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“…They maintained stable activities after about 5 hours of reaction time. However, a considerable decrease of H 2 S conversion was observed up to about 1-1.5 h. In our previous study [Shin et al, 2000], when a feed containing 1 vol% of H 2 S only (the balance helium, without oxygen) was passed over fresh pure V 2 O 5 , complete conversion of H 2 S was achieved initially and the fresh V 2 O 5 produced only complete oxidation product, SO 2 . The result indicated that an oxidized form of vanadium having very active surface oxygen produced SO 2 , and only less labile lattice oxygen in partially reduced vanadium oxides could produce elemental sulfur via redox mechanism.…”

Section: March 2005mentioning

confidence: 81%

Selective oxidation of hydrogen sulfide containing excess water and ammonia over Bi-V-Sb-O catalysts

Park

Hwang

et al. 2005

Korean J. Chem. Eng.

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We investigated the selective oxidation of hydrogen sulfide to elemental sulfur and ammonium thiosulfate by using Bi 4 V 2−x Sb x O 11−y catalysts. The catalysts were prepared by the calcination of a homogeneous mixture of Bi 2 O 3 , V 2 O 5 , and Sb 2 O 3 obtained by ball-milling adequate amounts of the three oxides. The main phases detected by XRD analysis were Bi 4 V 2 O 11 , Bi 1.33 V 2 O 6 , BiSbO 4 and BiVO 4. They showed good H 2 S conversion with less than 2% of SO 2 selectivity with a feed composition of H 2 S/O 2 /NH 3 /H 2 O/He=5/2.5/5/60/27.5 and GHSV=12,000 h −1 in the temperature ranges of 220-260 o C. The highest H 2 S conversion was obtained for x=0.2 in Bi 4 V 2−x Sb x O 11−y catalyst. TPR/TPO results showed that this catalyst had the highest amount of oxygen consumption. XPS analysis before and after reaction confirmed the least reduction of vanadium oxide phase for this catalyst during the reaction. It means that the catalyst with x=0.2 had the highest reoxidation capacity among the Bi 4 V 2− x Sb x O 11− y catalysts.

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Vanadium-containing catalysts for the selective oxidation of H2S to elemental sulfur in the presence of excess water

Cited by 28 publications

References 10 publications

H₂S-Selective Catalytic Oxidation: Catalysts and Processes

H₂S-Selective Catalytic Oxidation: Catalysts and Processes

Study on the catalytic reduction mechanism of SO2 by CO over doped copper perovskite catalyst in presence of oxygen

Selective oxidation of hydrogen sulfide containing excess water and ammonia over Bi-V-Sb-O catalysts

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Vanadium-containing catalysts for the selective oxidation of H2S to elemental sulfur in the presence of excess water

Cited by 28 publications

References 10 publications

H2S-Selective Catalytic Oxidation: Catalysts and Processes

H2S-Selective Catalytic Oxidation: Catalysts and Processes

Study on the catalytic reduction mechanism of SO2 by CO over doped copper perovskite catalyst in presence of oxygen

Selective oxidation of hydrogen sulfide containing excess water and ammonia over Bi-V-Sb-O catalysts

Contact Info

Product

Resources

About

H₂S-Selective Catalytic Oxidation: Catalysts and Processes

H₂S-Selective Catalytic Oxidation: Catalysts and Processes