Selectivity and Stability Enhancement of Iron Oxide Catalyst by Ceria Incorporation for Selective Oxidation of H<sub>2</sub>S to Sulfur

Koyuncu, Dilşad Dolunay Eslek; Yasyerli, Sena

doi:10.1021/ie8017059

Cited by 74 publications

(46 citation statements)

References 25 publications

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“…Conversely, sulfur selectivity increases from 94% to 98%. As we known, the FeS 2 formation is one of the main reasons for iron oxide based catalysts deactivation [3,6]. Besides, FeS 2 is the active site for oxidizing H 2 S to SO 2 [34][35][36], which is contradict with our results.…”

Section: Effect Of O 2 /H 2 S In Feed Streamcontrasting

confidence: 92%

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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: Effect Of O 2 /H 2 S In Feed Streamcontrasting

confidence: 92%

“…A condenser was located at the bottom of the reactor to trap the sulfur gas in effluent stream. Instantaneous fractional conversion of H 2 S, sulfur selectivity and sulfur yield were defined as follows [6]:…”

Section: Catalytic Testsmentioning

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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“…However, its sulfur selectivity is quite low due to the excess oxygen requirement. Recently, a number of methods have been established to modify iron oxide catalysts to obtain more selective and stable catalysts, particularly by incorporating a second metal element into the iron oxide structure [7][8][9][10][11] activity and stability at a relatively higher GHSV and a lower reaction temperature.…”

Section: Introductionmentioning

confidence: 99%

Catalytic behaviors of combined oxides derived from Mg/Al_xFe_1−x–Cl layered double hydroxides for H₂S selective oxidation

Wang

Tang

Qiao

et al. 2015

Catal. Sci. Technol.

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A series of Mg 2 Al x Fe 1−x LDH compounds was synthesized by a one-step method. The structural and chemical properties were studied by various methods and the derived oxides were tested for H 2 S selective oxidation. It was observed that the iron species existed mainly in the form of isolated Fe 3+ species, α-Fe 2 O 3 , γ-Fe 2 O 3 and Fe 3 O 4 . Moreover, the nature of the iron oxides was varied with the rise in the iron content.Significantly, the catalysts exhibited high catalytic activity and reasonable durability at a relatively lower temperature and higher GHSV. The catalysts obeyed the step-wise mechanism for H 2 S selective catalytic oxidation. And the chemically adsorbed oxygen on the oxygen vacancies participated in the H 2 S selective oxidation reaction and played a key role in the H 2 S selective oxidation into elemental sulfur. The catalyst deactivation was due mainly to the deposit of elemental sulfur. Additionally, the small amount of the formed less active Fe 2 ĲSO 4 ) 3 species also led to catalyst deactivation.

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“…Hydrogen sulfide (H 2 S) gas is a major source of impurity in a gasification process of fossil fuels and found in many tail-gas streams of biogas plant, syngas production plant, and petrochemical plant [1,2]. H 2 S gas is highly corrosive, toxic, and odorous in nature.…”

Section: Introductionmentioning

confidence: 99%

Highly Selective Room Temperature Monoreduction of Dinitro‐arenes by Hydrogen Sulfide under Liquid–Liquid Biphasic Catalysis

Mondal

Sen

2017

Int J of Chemical Kinetics

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Selective reduction of one of the nitro group present in dinitro aromatic compounds by a novel Zinin reagent, H 2 S-laden N-methyldiethanolamine (MDEA) solution, has been explored in the presence of tetra-n-butyl phosphonium bromide as a phase transfer catalyst under the liquid-liquid mode of reaction. Under the room temperature reaction condition, reduction of 2,4-dinitrotoluene (2,4-DNT) with H 2 S-laden MDEA leads to the selective reduction of one nitro group present either at the fourth position to obtain 4-amino-2-nitrotoluene (4A2NT) or at the second position to get 2-amino-4-nitrotoluene (2A4NT). The reaction was very fast to achieve 100% conversion, and the selectivity of 4A2NT is much higher than the 2A4NT. A detailed parametric study was performed to analyze the effect of parameters on 2,4-DNT conversion and selectivity of both the isomers. The apparent activation energy was found to be as high as 46.25 kJ/mol, and the reaction was found to be kinetically controlled. An empirical kinetic model has been developed to correlate with the conversion version time data obtained experimentally. The present system dealt with an industrial problem in dealing with H 2 S, present in by-product gaseous streams of many petroleum and natural gas industries. Novelties in the selective monoreduction lie in that fact that the reaction was done at room temperature

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Selectivity and Stability Enhancement of Iron Oxide Catalyst by Ceria Incorporation for Selective Oxidation of H₂S to Sulfur

Cited by 74 publications

References 25 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

Catalytic behaviors of combined oxides derived from Mg/Al_xFe_1−x–Cl layered double hydroxides for H₂S selective oxidation

Highly Selective Room Temperature Monoreduction of Dinitro‐arenes by Hydrogen Sulfide under Liquid–Liquid Biphasic Catalysis

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Selectivity and Stability Enhancement of Iron Oxide Catalyst by Ceria Incorporation for Selective Oxidation of H2S to Sulfur

Cited by 74 publications

References 25 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

Catalytic behaviors of combined oxides derived from Mg/AlxFe1−x–Cl layered double hydroxides for H2S selective oxidation

Highly Selective Room Temperature Monoreduction of Dinitro‐arenes by Hydrogen Sulfide under Liquid–Liquid Biphasic Catalysis

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Selectivity and Stability Enhancement of Iron Oxide Catalyst by Ceria Incorporation for Selective Oxidation of H₂S to Sulfur

Catalytic behaviors of combined oxides derived from Mg/Al_xFe_1−x–Cl layered double hydroxides for H₂S selective oxidation