Claus Catalysis and H<sub>2</sub>S Selective Oxidation

Pieplu, Anne; Saur, O.; Lavalley, Jean‐Claude; Legendre, O.; Nédez, C.

doi:10.1080/01614949808007113

Cited by 253 publications

(162 citation statements)

References 83 publications

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“…However, the sulfur yield mainly depends on the catalyst performance, which can be limited by the oxidation of the produced sulfur and complete oxidation of H 2 S to SO 2 (Eqs. (2) and (3)). Therefore, catalyst with high selectivity and activity is strongly needed [6].…”

Section: Introductionmentioning

confidence: 99%

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Selective catalytic oxidation of H2S over iron oxide supported on alumina-intercalated Laponite clay catalysts

Zhang

Dou

Wang

et al. 2013

Journal of Hazardous Materials

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h i g h l i g h t s• Fe/Al-Lap catalysts with mesoporous structure were synthesized.• Iron oxide mainly exists in form of isolate Fe 3+ in an oxidic environment.• Fe/Al-Lap catalysts show high catalytic activities at low temperature.• The high catalytic activities are ascribed to the interaction between iron oxide and alumina.• The formed Fe 2 (SO 4 ) 3 and elemental sulfur deposits on surface cause catalyst deactivation. g r a p h i c a l a b s t r a c tThe catalytic reaction and deactivation mechanisms for H 2 S selective oxidation over Fe/Al-Lap catalysts are shown in the illustration. The catalytic reaction follows Mars-van Krevelen mechanism. Moreover, the interaction between iron oxide and alumina, the strong acidity of the catalysts and the well dispersion of iron oxide improve the catalytic performance efficiently. Meanwhile, the catalyst deactivation is mainly due to the formation of Fe 2 (SO 4 ) 3 and elemental sulfur deposits on the surface. a r t i c l e i n f o b s t r a c tA series of iron oxide supported on alumina-intercalated clay catalysts (named Fe/Al-Lap catalysts) with mesoporous structure and high specific surface area were prepared. The structural and chemical properties were studied by nitrogen sorption isotherms, X-ray diffraction (XRD), UV-vis diffuse reflectance spectra (UV-vis DRS), X-ray photoelectron spectra (XPS), Fourier transform infrared spectroscopy (FTIR), H 2 temperature-programmed reduction (H 2 -TPR) and NH 3 temperature-programmed desorption (NH 3 -TPD) techniques. It was realized that iron oxide mainly existed in the form of isolated Fe 3+ in an oxidic environment. Fe/Al-Lap catalysts showed high catalytic activities in the temperature range of 120-200 • C without the presence of excessive O 2 . This can be attributed to the interaction between iron oxide and alumina, which improve the redox property of Fe 3+ efficiently. In addition, the strong acidity of catalysts and good dispersion of iron oxide were also beneficial to oxidation reaction. Among them, 7% Fe/AlLap catalyst presented the best catalytic performance at 180 • C. Finally, the catalytic and deactivation mechanisms were explored.Crown

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Section: Introductionmentioning

confidence: 99%

“…However, because of the thermodynamic limitations of Claus equilibrium reaction, there is still 4% H 2 S left in off-gas. In order to remove the residual H 2 S, the H 2 S selective catalytic oxidation technique is developed to directly convert H 2 S to elemental sulfur [1,2]. The reaction equations are as follows: (Eq.…”

Section: Introductionmentioning

confidence: 99%

Selective catalytic oxidation of H2S over iron oxide supported on alumina-intercalated Laponite clay catalysts

Zhang

Dou

Wang

et al. 2013

Journal of Hazardous Materials

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“…Over the past 30 years several processes have been proposed and developed for the removal of SO 2 from exhaust systems, DeSOx operations, (3)(4)(5)11). There is still not universally acceptable solution to this problem.…”

Section: Introductionmentioning

confidence: 99%

“…Governments are constantly tightening regulations to limit the production of SO 2 and emission of sulfur compounds into the air (3)(4)(5). Over the past 30 years several processes have been proposed and developed for the removal of SO 2 from exhaust systems, DeSOx operations, (3)(4)(5)11).…”

Section: Introductionmentioning

confidence: 99%

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Chemistry of SO ₂ and DeSO _x Processes on Oxide Nanoparticles

Rodríguez¹

2006

Synthesis, Properties, and Applications of Oxide Nanomaterials

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Sulfur Oxides Removal – Heterogeneous

Flytzani‐Stephanopoulos

Liu

2002

Encyclopedia of Catalysis

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This article describes the significant progress made in recent years in the development and fundamental understanding of catalysts for the reduction of sulfur dioxide by CO, synthesis gas, or methane. The direct catalytic reduction of SO 2 to elemental sulfur offers several advantages to power plants and industrial boilers using heavy fossil fuels, the main one being a simple process flowsheet for exhaust gas desulfurization with incorporated sulfur recovery. The environmental benefit is the recovery of sulfur in an innocuous form, which can be safely disposed of. Combined SO 2 /NO x removal can also be envisioned with such catalysts with ensuing overall system efficiency gains. Several high activity and high selectivity catalysts are presently available for SO 2 reduction by CO or syngas (CO + H 2 ), while under development are also catalysts for the reduction of sulfur dioxide with natural gas. These catalysts and the particulars of the associated SO 2 reduction processes are described in the article. Emphasis is given to catalysts based on cerium oxide which show promise for SO 2 reduction by either CO or methane, over a wide temperature window and in the presence of water and NO x . Mechanistic explanations are offered for the observed activity and selectivity of several of these catalyst compositions.

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Claus Catalysis and H₂S Selective Oxidation

Cited by 253 publications

References 83 publications

Selective catalytic oxidation of H2S over iron oxide supported on alumina-intercalated Laponite clay catalysts

Selective catalytic oxidation of H2S over iron oxide supported on alumina-intercalated Laponite clay catalysts

Chemistry of SO ₂ and DeSO _x Processes on Oxide Nanoparticles

Sulfur Oxides Removal – Heterogeneous

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Claus Catalysis and H2S Selective Oxidation

Cited by 253 publications

References 83 publications

Selective catalytic oxidation of H2S over iron oxide supported on alumina-intercalated Laponite clay catalysts

Selective catalytic oxidation of H2S over iron oxide supported on alumina-intercalated Laponite clay catalysts

Chemistry of SO 2 and DeSO x Processes on Oxide Nanoparticles

Sulfur Oxides Removal – Heterogeneous

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Product

Resources

About

Claus Catalysis and H₂S Selective Oxidation

Chemistry of SO ₂ and DeSO _x Processes on Oxide Nanoparticles