Synthesis, characterization and catalytic performance of vanadia-doped delaminated zirconia-pillared montmorillonite clay for the selective catalytic oxidation of hydrogen sulfide

Bineesh, Kanattukara Vijayan; Kim, Sang-Yun; Jermy, B. Rabindran; Park, Dae‐Won

doi:10.1016/j.molcata.2009.04.002

Cited by 45 publications

(29 citation statements)

References 54 publications

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“…Various materials based on clay minerals, are extensively used in many fields of life and industry as nanocomposite fillers, thickeners in paints, oil-base drilling mud, adsorbents of heavy metals, and organic pollutants as well as catalysts (e.g., for Fischer-Tropsch synthesis, catalytic cracking, Friedel-Crafts reaction, combustion of volatile organic compounds, oxidation of H 2 S) [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Effect of Fe3+ ions present in the structure of poly(acrylic acid)/montmorillonite composites on their thermal decomposition

Natkański

Kuśtrowski

Białas

et al. 2013

J Therm Anal Calorim

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Poly(acrylic acid)/montmorillonite (MMT) composites with various polymer contents were synthesized by in situ polymerization technique. The structure of obtained materials was characterized by powder X-ray diffraction and infrared spectroscopy (FTIR). It was found that only a limited amount of hydrogel could be introduced between the clay layers. The remaining part of polymer was deposited on the external surface of clay particles. The introduction of the polymer modifier significantly increased the adsorption capacity of MMT in the elimination of Fe 3?ions from aqueous solution. The thermal behavior of the samples before and after the Fe 3? adsorption was examined by thermogravimetry and differential thermal analysis. Moreover, the composition of gaseous products evolved during decomposition was determined by FTIR. The materials after Fe 3? adsorption exhibited different thermal stability in oxidizing atmosphere than the fresh samples. Fe 3? cations, forming FeO x species during thermal treatment, appeared to be effective catalysts of polymer oxidation.

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Section: Introductionmentioning

confidence: 99%

Effect of Fe3+ ions present in the structure of poly(acrylic acid)/montmorillonite composites on their thermal decomposition

Natkański

Kuśtrowski

Białas

et al. 2013

J Therm Anal Calorim

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“…Bineesh et al [15] noted that the effect of water could be positive or negative depending on its concentration. The authors suggested that when there were very high levels of water it could compete with H 2 S for the catalyst's active sites; furthermore, the yield of the reverse Claus reaction could be increased by excess water.…”

Section: Resultsmentioning

confidence: 99%

Effect of Temperature and Water on the Selective Oxidation of H2S to Elemental Sulfur on a Macroscopic Carbon Nanofiber Based Catalyst

2011

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Carbon nanofibers were synthesized on graphite felt substrate by catalytic decomposition of ethane. The preshaped material was efficiently used as catalyst support for the active phase NiS 2 in the direct oxidation of H 2 S into elemental sulfur. The catalyst was extremely active, selective, and stable at 60°C in a fixed bed reactor due to the high resistance of carbon nanofiber based catalyst to the solid sulfur loading. This is explained by the specific mode of sulfur deposition, involving the role of water in the sulfur transport and the hydrophobic nature of the support.

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“…The NH 3 desorption patterns can be classified into weak acid sites (desorption at 100 • C) and strong acid sites (desorption at 850 • C). The peak at low temperature is due to ammonia desorption from the weak Bronsted acid sites, while that at high temperature corresponds to the desorbed ammonia from strong Lewis acid sites [30,31]. Compared with the host clay, the intensity of the latter peak is enhanced obviously, and the peak shift towards higher temperature.…”

Section: Acid Properties Of Catalystsmentioning

confidence: 97%

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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Synthesis, characterization and catalytic performance of vanadia-doped delaminated zirconia-pillared montmorillonite clay for the selective catalytic oxidation of hydrogen sulfide

Cited by 45 publications

References 54 publications

Effect of Fe3+ ions present in the structure of poly(acrylic acid)/montmorillonite composites on their thermal decomposition

Effect of Fe3+ ions present in the structure of poly(acrylic acid)/montmorillonite composites on their thermal decomposition

Effect of Temperature and Water on the Selective Oxidation of H2S to Elemental Sulfur on a Macroscopic Carbon Nanofiber Based Catalyst

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

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