Effect of pH and Surface Chemistry on the Mechanism of H2S Removal by Activated Carbons

Adib, Foad; Bagreev, Andrey; Bandosz, Teresa J.

doi:10.1006/jcis.1999.6335

Cited by 152 publications

(187 citation statements)

References 28 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%

“…3 plots the derivative thermogravimetric (DTG) curves and the corresponding composition of the effluent gas as a function of the temperature. Based on the literature, the sulfur compounds desorption can occur in two temperature ranges, and the corresponding effluent gas composition provides information on the nature of these compounds [23,24,26]: -In the first zone (plotted in grey in Fig. 3) between 200 and 350°C, a SO 2 release indicates the desorption of physisorbed SO 2 or other sulfur oxides, while a H 2 S release reveals the decomposition of metallic sulphides.…”

Section: Identification Of Sulfur Products Using Tga-ms Under Nmentioning

confidence: 99%

“…Most of the studies dealing with gas desulfurization at room temperature using activated carbon were focused on H 2 S removal from moist air. In the presence of oxygen and humidity, the interactions between H 2 S and the complex surface properties of the activated chars (O-containing groups, mineral species, pH) lead to several retention mechanisms including dissociative adsorption and oxidation [23][24][25][26]. High specific surface areas and large microporous volumes are also known to promote the purification efficiency of the chars [13].…”

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

103

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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: Identification Of Sulfur Products Using Tga-ms Under Nmentioning

confidence: 99%

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

103

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“…As indicated by Adib et al (1999), a basic environment favors the formation of S 2-, which may pro- Table 4 shows that the activated carbon adsorption capacity is observed to depend highly on oxygen presence. Sulfur adsorption capacities of the samples in the N 2 /CO 2 /O 2 gas matrix are higher than in the others.…”

Section: Resultsmentioning

confidence: 98%

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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“…Untersuchungen zur adsorptiven Abtrennung von Schwefelwasserstoff an Aktivkohlen wurden in zahlreichen Beiträgen veröffentlicht. Adib et al [12,13] zeigen, dass die Adsorptionskapazitäten stark von der Oberflächenchemie der Kohlen abhängig sind. Durch die Verwendung von Imprägnierungschemikalien wie z.B.…”

Section: Adsorptionunclassified

Adsorptive Removal of Sulfurous Components from Natural Gas

Steuten

Pasel

Luckas

et al. 2012

Chemie Ingenieur Technik

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Bei der technischen Nutzung von Erdgas müssen toxische und korrosive Verbindungen entfernt werden. Ergebnisse der Untersuchung der Adsorption verschiedener Schwefelverbindungen, CO2 und Wasser aus einem Trägergas (CH4 oder N2) an einem Festbett werden vorgestellt. Die Versuche wurden an zwei industriell eingesetzten Adsorbentien (Silica‐Alumina‐Gel, 5A‐Zeolith) bei 298 K und 1,3 bar (abs.) im Spurenbereich bis 2000 Mol‐ppm durchgeführt. Aus den experimentellen Durchbruchskurven wurden mittels Massenbilanzen Adsorptionskapazitäten für die Adsorptive bestimmt und an bekannte Isothermengleichungen angepasst. Zur Modellierung der dynamischen Vorgänge im Festbett wurde ein einfacher Linear‐driving‐force‐Ansatz gewählt, mit dem eine gute Übereinstimmung zwischen Experiment und Modellierung gefunden wurde.

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Effect of pH and Surface Chemistry on the Mechanism of H2S Removal by Activated Carbons

Cited by 152 publications

References 28 publications

H2S removal from syngas using wastes pyrolysis chars

H2S removal from syngas using wastes pyrolysis chars

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

Adsorptive Removal of Sulfurous Components from Natural Gas

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