Selective Oxidation Of Hydrogen Sulfide To Elemental Sulfur On Supported Iron Sulfate Catalysts

Brink, P.J. van den; Terorde, Robert J. A. M.; Moors, J.H.; Dillen, A.J. van; Geus, J.W.

doi:10.1016/s0167-2991(08)61665-1

Cited by 25 publications

(7 citation statements)

References 16 publications

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“…Accordingly, additional processes dealing with the Claus tail gaseous treatment have been developed (direct H 2 S oxidation with no thermodynamic limitations) as to make possible the almost complete (up to 99.9%) hydrogen sulfide conversion into elemental sulfur (eq ) and minimize SO 2 emissions from the incinerator. Among the methods for the gas tail treatment, the Superclaus process developed in 1985 has allowed for upgrading the H 2 S desulfurization efficiency up to 99.5% by means of Fe and Cr catalysts supported on alumina or silica. , One main drawback of the direct catalytic H 2 S oxidation is the too high efficiency of the employed catalytic systems that may favor overoxidation paths (eq ). …”

Section: Catalytic Applicationsmentioning

confidence: 99%

Porous Silicon Carbide (SiC): A Chance for Improving Catalysts or Just Another Active-Phase Carrier?

et al. 2021

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There is an obvious gap between efforts dedicated to the control of chemicophysical and morphological properties of catalyst active phases and the attention paid to the search of new materials to be employed as functional carriers in the upgrading of heterogeneous catalysts. Economic constraints and common habits in preparing heterogeneous catalysts have narrowed the selection of active-phase carriers to a handful of materials: oxide-based ceramics (e.g. Al2O3, SiO2, TiO2, and aluminosilicates–zeolites) and carbon. However, these carriers occasionally face chemicophysical constraints that limit their application in catalysis. For instance, oxides are easily corroded by acids or bases, and carbon is not resistant to oxidation. Therefore, these carriers cannot be recycled. Moreover, the poor thermal conductivity of metal oxide carriers often translates into permanent alterations of the catalyst active sites (i.e. metal active-phase sintering) that compromise the catalyst performance and its lifetime on run. Therefore, the development of new carriers for the design and synthesis of advanced functional catalytic materials and processes is an urgent priority for the heterogeneous catalysis of the future. Silicon carbide (SiC) is a non-oxide semiconductor with unique chemicophysical properties that make it highly attractive in several branches of catalysis. Accordingly, the past decade has witnessed a large increase of reports dedicated to the design of SiC-based catalysts, also in light of a steadily growing portfolio of porous SiC materials covering a wide range of well-controlled pore structure and surface properties. This review article provides a comprehensive overview on the synthesis and use of macro/mesoporous SiC materials in catalysis, stressing their unique features for the design of efficient, cost-effective, and easy to scale-up heterogeneous catalysts, outlining their success where other and more classical oxide-based supports failed. All applications of SiC in catalysis will be reviewed from the perspective of a given chemical reaction, highlighting all improvements rising from the use of SiC in terms of activity, selectivity, and process sustainability. We feel that the experienced viewpoint of SiC-based catalyst producers and end users (these authors) and their critical presentation of a comprehensive overview on the applications of SiC in catalysis will help the readership to create its own opinion on the central role of SiC for the future of heterogeneous catalysis.

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Section: Catalytic Applicationsmentioning

confidence: 99%

Porous Silicon Carbide (SiC): A Chance for Improving Catalysts or Just Another Active-Phase Carrier?

et al. 2021

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“…In the last years, several metal oxides have been studied as the active phase in the selective oxidation H2S reaction for elemental sulfur formation. The catalysts most studied are: V2O5, Mn2O3, Fe2O3, CuO, NiO, CoO and Bi2O3 [11][12][13][14][15]. In this sense, isotopical studies have reported that metal oxides are partially reduced under the reaction medium forming MO2species, which leads to MOSand then MS2species by the following reaction exchange (reactions 5 and 6) [15].…”

Section: Introductionmentioning

confidence: 99%

Fe2O3 supported on hollow micro/mesospheres silica for the catalytic partial oxidation of H2S to sulfur

Cecilia

Soriano

Correia

et al. 2020

Microporous and Mesoporous Materials

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A family of Fe-based catalysts supported on hollow silica mesospheres have been synthesized and tested in the catalytic partial oxidation of H2S to elemental sulfur at 170-180ºC, atmospheric pressure and under 300 minutes of time-on-stream. The characterization of the synthesized catalysts by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), diffuse reflectance UV-vis spectra (DRS), H2-termoprogrammed reduction (H2-TPR), N2 adsorptiondesorption at -196 ºC and X-ray photoelectron spectroscopy (XPS) reveals the formation of a catalytic system with high micro-and mesoporosity and high dispersion of the Fe2O3 species. The catalytic results reported a high activity in the partial oxidation of H2S, reaching over the HMS-10Fe (i.e. with 10 wt% of iron loading) catalyst at 180 ° C and after 300 minutes of time in the stream (TOS), a higher conversion value close to 94% with a selectivity towards elemental sulfur of 98%. The comparison of HMS-10Fe catalysts with other SiO2-based supports, as a fumed silica (Cab-osil; Cab) or a mesoporous silica (SBA-15), indicates changes in the catalytic activity for H2S conversion depending on support, and showing the following trend: HMS-10Fe > SBA-10Fe > Cab-10Fe. These results suggest that the use of a support with a narrow pore tend to achieve facilitate the iron dispersion favoring higher conversion rates.

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“…Several heterogeneous catalytic systems have been commercialized for the tail gas clean-up process. The Superclaus and BSR were developed for the direct oxidation of H 2 S to sulfur above dew point [4,5]. Heterogeneous catalytic systems for the processes showed high activity, but the high reaction temperature resulted in a low stability of the catalysts by sulfidation of metal and metal oxide components as well as in the low selectivity by the formation of SO 2 .…”

Section: Introductionmentioning

confidence: 99%

Liquid-phase oxidation of hydrogen sulfide to sulfur over CuO/MgO catalyst

Lee

Jung

Joo

et al. 2005

React Kinet Catal Lett

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The effect of CuO loading on CuO/MgO catalysts was investigated for liquidphase oxidation of H 2 S to sulfur. CuO/MgO catalysts were prepared by impregnating MgO with aqueous copper nitrate solution. All of the catalysts were characterized by BET surface analyzer, X-ray diffraction (XRD), and temperature-programmed reduction (TPR). It was observed that the H 2 S removal capacity with respect to CuO loading increased up to 4 wt.%, and then decreased with further increase in CuO loading. CuO addition up to 4 wt.% increased the BET surface areas, but beyond that it was decreased. The XRD showed that well dispersed CuO particles could be present on CuO/MgO at less than 4 wt. % CuO loading. The crystallites of bulk CuO became evident on CuO/MgO with more than 6 wt.% CuO loading, which were confirmed by a XRD. TPR experiments showed that CuO/MgO catalysts with CuO loading above 6 wt.% consisted of two phases of a well-dispersed and crystalline CuO. It was suggested that Cu 2+ in the well-dispersed copper oxide domain could be the active species in the wet oxidation of H 2 S.

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Selective Oxidation Of Hydrogen Sulfide To Elemental Sulfur On Supported Iron Sulfate Catalysts

Cited by 25 publications

References 16 publications

Porous Silicon Carbide (SiC): A Chance for Improving Catalysts or Just Another Active-Phase Carrier?

Porous Silicon Carbide (SiC): A Chance for Improving Catalysts or Just Another Active-Phase Carrier?

Fe2O3 supported on hollow micro/mesospheres silica for the catalytic partial oxidation of H2S to sulfur

Liquid-phase oxidation of hydrogen sulfide to sulfur over CuO/MgO catalyst

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