Adsorption behaviors of ammonia and hydrogen sulfide on activated carbon prepared from petroleum coke by KOH chemical activation

Mochizuki, Takuya; Kubota, Mitsuhiro; Matsuda, Hitoki; Camacho, Luis F. D’Elia

doi:10.1016/j.fuproc.2015.12.012

Cited by 136 publications

(27 citation statements)

References 24 publications

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“…The results are in agreement with the diameter of the H 2 S molecule (1.9 Å). While micropores are described in the literature as important active sites [26,30,32], the mesopores lower than 70 Å appeared as important adsorption sites for H 2 S in our study.…”

Section: Evolution Of the Textural Propertiesmentioning

confidence: 42%

“…This is explained by a better dispersion of the minerals on the surface, and by a faster diffusion of the H 2 S molecules from the gas to the adsorption sites. While micropores are described in the literature as active sites for H 2 S adsorption [26,30,32], mesopores lower than 70 Å were identified in this study as important adsorption sites (Fig. 2).…”

Section: Influence Of the Physicochemical Properties Of The Chars On mentioning

confidence: 61%

“…Usually, the conditions of char's production are adjusted in order to obtain materials with suitable properties [27]. Special modifications using chemicals, such as caustic impregnations or activation [28][29][30] and metal impregnation [21,22,[31][32][33][34] are carried out to enhance the activated carbon efficiency. However, these processes have high environmental footprint (use and management of chemicals), increase the cost of the materials and jeopardize their regeneration (low temperature of self-ignition) [35].…”

Section: Introductionmentioning

confidence: 99%

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H2S removal from syngas using wastes pyrolysis chars

Hervy

Minh

Gérente

et al. 2018

Chemical Engineering Journal

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A B S T R A C TPyrolysis chars from wastes were investigated as sorbents for H 2 S removal from syngas. The H 2 S removal tests were performed at ambient temperature in various dry gas matrices (N 2 , Air, Syngas) to study the effect of the gas composition on the adsorption efficiency. Two chars were produced by the pyrolysis of: used wood pallets (UWP), and a 50/50% mixture of food waste (FW) and coagulation-flocculation sludge (CFS). The chars were functionalized by low-cost processes without chemicals: gas phase oxygenation and steam activation. Activated chars were the most efficient materials due to their large specific surface area, alkaline pH, basic O-containing groups and structural defects in graphene-like sheets. Raman analysis evidenced that inherent mineral species (especially Ca and Fe) increased the H 2 S removal efficiency by promoting the formation of metal sulfide and metal sulphate species at the char surface. Mesopores lower than 70 Å were revealed to be important adsorption sites. Under dry Syngas matrix, the chars remained efficient and selective toward H 2 S removal despite the presence of CO 2 , while O 2 in the Air matrix decreased their removal capacity due to the formation of sulfur acid species. The most efficient material was the steam activated char from FW/CFS, with a removal capacity of 65 mg H2S .g −1 under dry syngas. This char was proved to be completely regenerated with a thermal treatment under N 2 at 750°C. This study demonstrated that activated chars from food waste and sludge could be used as eco-friendly, affordable, and selective materials for syngas desulfurization even under dry atmosphere.

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Section: Evolution Of the Textural Propertiesmentioning

confidence: 42%

Section: Influence Of the Physicochemical Properties Of The Chars On mentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

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H2S removal from syngas using wastes pyrolysis chars

Hervy

Minh

Gérente

et al. 2018

Chemical Engineering Journal

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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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“…Compared with other studies, the CH 3 COOH adsorption capacity with activated carbon obtained by Bi et al and Park et al was around 132 and 89.67 mg/g, respectively. For H 2 S adsorption, Mochizuki et al reported that adsorption capacity of H 2 S was about 95 mg/g using petroleum coke activated carbon. In addition, in our previous study, the adsorption capacities of H 2 S were 410.80 mg/g and 220.37 mg/g using rice husk and cocoa shell activated carbons, respectively.…”

Section: Resultsmentioning

confidence: 99%

Adsorption of acetic acid and hydrogen sulfide using NaOH impregnated activated carbon for indoor air purification

Wang

Nam

Gebreegziabher

et al. 2020

Engineering Reports

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Excessive exposure to hydrogen sulfide (H 2 S) and acetic acid (CH 3 COOH) gases is extremely dangerous in a confined space. An effective indoor air pollutant removal porous carbon filter was developed using NaOH impregnated on activated carbon (NaOH/AC) for the adsorption of H 2 S and CH 3 COOH. Activated carbon (NaOH/AC) filter was characterized using various methods, indicating good physical and chemical properties (especially -OH functional groups) for the adsorption of air pollutants. The prepared NaOH/AC filter was cured at different curing temperatures and residence times to understand the effect of the curing conditions on the adsorption performance. The best results were obtained with NaOH/AC filter cured at 100 • C for 20 minutes as it eliminated the initial concentration of 400 ppm of CH 3 COOH in 15 minutes and H 2 S in 30 minutes at 20 • C and 60% relative humidity. Isotherm and kinetic models were used to analyze the adsorption process. Langmuir isotherm and pseudo-second order kinetic models provided the best fit to the adsorption of CH 3 COOH and H 2 S on NaOH/AC filter. The adsorption mechanism was controlled by the intraparticle diffusion combined with film diffusion. The maximum adsorption capacity of NaOH/AC filter was 473 mg/g for H 2 S adsorption, and 550 mg/g for CH 3 COOH adsorption. In addition, the spent NaOH/AC filter was regenerated for reuse.This study is expected to develop low-cost and effective porous carbon filter using NaOH-modified activated carbon for indoor air purification.

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Adsorption behaviors of ammonia and hydrogen sulfide on activated carbon prepared from petroleum coke by KOH chemical activation

Cited by 136 publications

References 24 publications

H2S removal from syngas using wastes pyrolysis chars

H2S removal from syngas using wastes pyrolysis chars

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

Adsorption of acetic acid and hydrogen sulfide using NaOH impregnated activated carbon for indoor air purification

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