The low temperature selective oxidation of H2S to elemental sulfur on TiO2 supported V2O5 catalysts

Pongthawornsakun, Boontida; Phatyenchuen, Suvijak; Panpranot, Joongjai; Praserthdam, Piyasan

doi:10.1016/j.jece.2018.01.045

Cited by 43 publications

(20 citation statements)

References 60 publications

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“…Different vanadium-based catalysts have already been studied in the past [2][3][4][5]. In particular, bulk V2O5 phase has been reported to have a better performance than other bulk oxides like magnesium oxide, bismuth oxide, and molybdenum oxide, iron oxide [6][7][8].…”

Section: " +mentioning

confidence: 99%

H2S chemical looping selective and preferential oxidation to sulfur by bulk V2O5

Kane

Guerrero-Caballero

Löfberg

2020

Applied Catalysis B: Environmental

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The concept of chemical looping is applied for the first time to selective oxidation of H2S to elemental sulfur. An oxygen carrier (OC) is exposed to cyclic reduction by H2S and oxidation by O2. The properties of bulk V2O5 as OC are explored for this reaction in the 150-200 °C temperature range. Steady cyclic behavior can be obtained with high selectivity towards elemental sulfur. Some undesired SO2 is formed during exposure to H2S but more significantly during re-oxidation of the OC. This indicates that bulk V2O5 does not completely oxidize the adsorbed H2S in the reductant step. Characterizations indicate that V 4+ and V 5+ species are mostly involved in the process. Preferential oxidation in presence of CH4 is confirmed on this OC. Although optimization needs to be done, the potential of chemical looping concept for direct preferential oxidation of H2S in natural gas and biogas is demonstrated.

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Section: " +mentioning

confidence: 99%

H2S chemical looping selective and preferential oxidation to sulfur by bulk V2O5

Kane

Guerrero-Caballero

Löfberg

2020

Applied Catalysis B: Environmental

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“…[42] The peak at 531.3 eV exhibits the presence of the O in TiO 2 or indicates the presence of Ti 2 O 3 [43,44] while 533 eV is due to adsorbed molecular water. [5] In case of alumina-based catalyst, 531.4 eV peak is attributed to the oxygen from Al 2 O 3.…”

Section: Xps Analysismentioning

confidence: 99%

“…Mainly, the bulk V 2 O 5 phase has been reported to have a better performance than other bulk oxides like magnesium oxide, bismuth oxide, and molybdenum oxide, iron oxide. [1][2][3][4][5] Supported, [1,[6][7][8] and unsupported [9] vanadium oxides have been considered as catalysts for the selective oxidation of H 2 S. Vanadium oxides supported on silica, [10,11] alumina, [8,12,13] titania, [5,11] zeolite, [14] and Ti pillared mormorillonite have been recently reported. [15] Vanadium based catalysts are thus active and selective for the oxidation of H 2 S to sulfur at relatively low temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…In many cases, they are doped with promoters to improve their activity and/or selectivity, and supports are used to improve mechanical strength, thermal stability, and lifetime. [18] Various studies [5,8,19,20] showed that the dispersion of vanadium on different supports plays a vital role in the selective oxidation reaction of H 2 S. It has been reported that the TiO 2 -supported vanadium catalyst displayed much better redox characteristics compared to those supported on SiO 2 , resulting in better stable catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

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Chemical Looping Selective Oxidation of H₂S using V₂O₅ Impregnated over Different Supports as Oxygen Carriers

2020

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Chemical looping concept is proposed to improve the efficiency of selective oxidation of H 2 S into elemental sulfur. V 2 O 5 as an active oxygen carrier, is impregnated on different supports and exposed cyclically to reductant (H 2 S) and to oxidant (O 2 ). Among all, TiO 2 and SiO 2 proved as better supports for V 2 O 5 as they provided more formation of elemental sulfur than undesired SO 2 in the reductant step. Results indicate that the support can either directly react and provide oxygen to the process like for CeO 2 or indirectly affect the properties of the active phase, leading either into the improvement, as for TiO 2 and SiO 2 , or worsening, as in case of Al 2 O 3 and ZrO 2 . Oxygen carriers with partially reduced species, i. e., the combination of V 5 + and V 4 + , show better performances than carriers containing mostly highly oxidized V 5 + species. Interaction between the active phase and support plays a vital role for the controls of the formation of these partially reduced species.[a] T.

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“…Furthermore, they found that the reduced V species were related with a low selectivity to SO 2 . Following a similar approach, other groups investigated the use of supported catalysts, such as VOx/TiO 2 [74], VOx/CeO 2 [75,76], and VOx/SiO 2 [77], and of vanadium oxides bronzes [78], which were the mechanism they found to be quite similar to the one already described and demonstrated by López-Nieto's group, with the oxidation and subsequent regeneration of the vanadium active phases, from V 5+ to V 4+ under reaction conditions.…”

Section: Removal Of H 2 Smentioning

confidence: 99%

V-Containing Mixed Oxide Catalysts for Reduction–Oxidation-Based Reactions with Environmental Applications: A Short Review

Guerrero‐Pérez

2018

Catalysts

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V-containing mixed oxide catalytic materials are well known as active for partial oxidation reactions. Oxidation reactions are used in industrial chemistry and for the abatement of pollutants. An analysis of the literature in this field during the past few years shows a clear increase in the use of vanadium-based materials as catalysts for environmental applications. The present contribution makes a brief revision of the main applications of vanadium containing mixed oxides in environmental catalysis, analyzing the properties that present the catalysts with a better behavior that, in most cases, is related with the stabilization of reduced vanadium species (as V4+/V3+) during reaction.

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The low temperature selective oxidation of H2S to elemental sulfur on TiO2 supported V2O5 catalysts

Cited by 43 publications

References 60 publications

H2S chemical looping selective and preferential oxidation to sulfur by bulk V2O5

H2S chemical looping selective and preferential oxidation to sulfur by bulk V2O5

Chemical Looping Selective Oxidation of H₂S using V₂O₅ Impregnated over Different Supports as Oxygen Carriers

V-Containing Mixed Oxide Catalysts for Reduction–Oxidation-Based Reactions with Environmental Applications: A Short Review

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The low temperature selective oxidation of H2S to elemental sulfur on TiO2 supported V2O5 catalysts

Cited by 43 publications

References 60 publications

H2S chemical looping selective and preferential oxidation to sulfur by bulk V2O5

H2S chemical looping selective and preferential oxidation to sulfur by bulk V2O5

Chemical Looping Selective Oxidation of H2S using V2O5 Impregnated over Different Supports as Oxygen Carriers

V-Containing Mixed Oxide Catalysts for Reduction–Oxidation-Based Reactions with Environmental Applications: A Short Review

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Chemical Looping Selective Oxidation of H₂S using V₂O₅ Impregnated over Different Supports as Oxygen Carriers