On the Adsorption/Oxidation of Hydrogen Sulfide on Activated Carbons at Ambient Temperatures

Bandosz, Teresa J.

doi:10.1006/jcis.2001.7952

Cited by 328 publications

(289 citation statements)

References 58 publications

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“…Thus, even when reactions (1) and (2) have negligible effects upon CO 2 transport, its presence affects the permeation of H 2 S because of the influence of these reactions upon pH (Meldon and Dutta, 1994). Additionally, Bandosz (2002) and Bouzaza et al (2004) stated that high-valent sulphur compound formation is promoted and H 2 S dissociation is limited in an acidic environment, thus sulphur removal capacity decreases. Figure 2: Effect of relative humidity on the outlet H 2 S concentration in (a) N 2 gas (b) N 2 /CO 2 (63.3% N 2 /36.7% CO 2 ) gas mixture at T= 25 ºC, 15000 h -1 50 ppm H 2 S inlet conc.…”

Section: Resultsmentioning

confidence: 99%

Investigation of Impregnated Activated Carbon Properties Used in Hydrogen Sulfide Fine Removal

Isik-Gulsac

2016

Braz. J. Chem. Eng.

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-The effects of relative humidity (RH), carbon dioxide (CO 2 ), methane (CH 4 ), oxygen (O 2 ) presence and gas hourly space velocity (GHSV) on H 2 S adsorption dynamics of KOH/CaO impregnated activated carbon are investigated in this study. X-ray diffraction (XRD), scanning electron microscopy with energy dispersive X-ray detector (SEM-EDX), thermogravimetric analysis (TGA), and Fourier Transform Infrared Spectroscopy (FTIR) techniques are applied and nitrogen adsorption characteristics are determined for characterization. The presence of water, O 2 and lower GHSV has beneficial effects on the activated carbon performance. CO 2 decreases the adsorption capacity due to its acidic characteristics. Best adsorption capacity is obtained as 13 wt % in KOH/CaO impregnated activated carbon, in a CH 4 (60%)/CO 2 (38%)/O 2 (2%) gas atmosphere, at ambient temperature, RH 90 and 5000 h -1 GHSV. Sulphur species formation was verified with the help of SEM-EDX, XRD, TGA, FTIR and nitrogen adsorption analysis on the exhausted samples.

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Section: Resultsmentioning

confidence: 99%

Investigation of Impregnated Activated Carbon Properties Used in Hydrogen Sulfide Fine Removal

Isik-Gulsac

2016

Braz. J. Chem. Eng.

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“…H 2 S also occurs in volcanic and natural gases. Several processes are available for the treatment of hydrogen sulfide, including absorption [1][2][3][4][5], adsorption [6][7][8][9][10][11], and membrane separation [12][13][14][15][16]. These methods generally entail high energy, chemical and disposal costs.…”

Section: Introductionmentioning

confidence: 99%

Removal of hydrogen sulfide in air using cellular concrete waste: Biotic and abiotic filtrations

Jaber

Couvert

Amrane

et al. 2017

Chemical Engineering Journal

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Please cite this article as: M. Ben Jaber, A. Couvert, A. Amrane, P.L. Cloirec, E. Dumont, Removal of hydrogen sulfide in air using cellular concrete waste: biotic and abiotic filtrations, Chemical Engineering Journal (2017), doi: http://dx.doi.org/10. 1016/j.cej.2017.03.014 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractThe objective of this study was to investigate the removal of hydrogen sulfide (H 2 S) present in air using cellular concrete waste as the packing material. Air filtration was performed under biotic and abiotic conditions. Experiments were carried out in a laboratory-scale PVC column (internal diameter of 300 mm) filled with a volume of 70 L of cellular concrete (1 m height).The polluted air flow was generated at 4 m 3 h -1 corresponding to an Empty Bed Residence Time (EBRT) of 63 s. In dry conditions without biomass (abiotic conditions), cellular concrete can be an effective medium for the treatment of H 2 S in air. For an H 2 S concentration of 100 ppmv, the removal efficiency was around 70 % (Elimination Capacity (EC) of 5.6 g m -3 h -1 ). This finding can be explained by the physicochemical reactions that can take place between H 2 S and the cellular concrete components (mainly CaO, CaCO 3 and Fe 2 O 3 ).However, interactions between cellular concrete and H 2 S are not yet fully understood. Used as a packing material for H 2 S biofiltration (biotic conditions), cellular concrete waste efficiently 2 treated (Removal Efficiency = 100 %) high concentrations of H 2 S (up to 133 ppmv corresponding to an EC of up to 10.5 g m -3 h -1 ). Physicochemical and biological mechanisms explaining H 2 S removal seem to occur simultaneously in the biofilter. At an EBRT of 63 s, the maximal elimination capacity (EC max ) was 17.8 g m -3 h -1 . A packed bed of cellular concrete also presents a satisfactory mechanical behavior with low pressure drops.

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“…However, its production is very expensive and the used up activated carbon can hardly be regenerated, thus most activated carbon has to be treated as hazardous waste after being used for H 2 S filtering purposes. 3,6 The Claus process operates above 900 • C, partly oxidizing the gas to produce water and atomic sulfur via the two steps given in equations (1) and (2). 1,7,8 H 2 S + 3/2 O 2 → H 2 S + SO 2 (1)…”

Section: Introductionmentioning

confidence: 99%

Efficient new process for the desulfurization of mixtures of air and hydrogen sulfide via a dielectric barrier discharge plasma

Dahle

2015

AIP Advances

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The efficient removal of hydrogen sulfide, H2S, from streams of H2S in air via a dielectric barrier discharge (DBD) plasma has been investigated using a quadrupole mass spectrometer. A suitable plasma device with a reservoir for storing sorbent powder of various kinds within the plasma region was constructed. Plasma treatments of gas streams with high concentrations of hydrogen sulfide in air yielded a removal of more than 98% of the initial hydrogen sulfide and a deposition of sulfur at the surface of the dielectric, while small amounts of sulfur dioxide were generated. The presence of calcium carbonate within the plasma region of the DBD device resulted in the removal of over 99% of the initial hydrogen sulfide content and the removal of 98% of the initial sulfur dioxide impurities from the gas mixture.

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On the Adsorption/Oxidation of Hydrogen Sulfide on Activated Carbons at Ambient Temperatures

Cited by 328 publications

References 58 publications

Investigation of Impregnated Activated Carbon Properties Used in Hydrogen Sulfide Fine Removal

Investigation of Impregnated Activated Carbon Properties Used in Hydrogen Sulfide Fine Removal

Removal of hydrogen sulfide in air using cellular concrete waste: Biotic and abiotic filtrations

Efficient new process for the desulfurization of mixtures of air and hydrogen sulfide via a dielectric barrier discharge plasma

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