Metal-doped apatitic calcium phosphates: preparation, characterization, and reactivity in the removal of hydrogen sulfide from gas phase

Stita, Sonia; Martı́nez, Marta Galera; Pham, Xuan‐Huynh; Minh, Doan Pham; Nzihou, Ange; Sharrock, Patrick

doi:10.1080/09276440.2015.1049096

Cited by 4 publications

(4 citation statements)

References 34 publications

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“…Thus, the 3.6 wt% of Fe present in the ac.UWP ashes (Table 2) locally promoted the H 2 S removal through the formation of iron sulfides. Previous studies reported the important role of iron in the H 2 S removal capacity of several sorbents [20,55,56]. Recently, small amount of copper was proved to increase the reactivity of ZnO for H 2 S adsorption [21].…”

Section: Identification Of Sulfur Products Using Raman Spectroscopymentioning

confidence: 99%

“…Several adsorbents have been studied for gas desulfurization, such as zeolites [12], activated carbon [13], and metal oxides (zinc, cobalt, iron) dispersed on various supports: mesoporous silica [14][15][16], graphite oxides [17][18][19], hydroxyapatite [20], and functionalized activated carbon [21,22]. Most of the studies dealing with gas desulfurization at room temperature using activated carbon were focused on H 2 S removal from moist air.…”

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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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: Identification Of Sulfur Products Using Raman Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

H2S removal from syngas using wastes pyrolysis chars

Hervy

Minh

Gérente

et al. 2018

Chemical Engineering Journal

Self Cite

103

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“…Galera Martinez [32] worked on valorization of industrial carbonate residues for the treatment of hydrogen sulfide in gas effluents, and explained the catalytic oxidation of H 2 S, catalyzed by various metals present in these solid wastes (Ca, Mg, Fe etc.). Also, Stita et al [37] studied metal-doped apatitic calcium phosphates for the removal of hydrogen sulfide from gas phase, while Pham Xuan et al [28] studied on the valorization of calcium carbonate-based solid wastes for the treatment of hydrogen sulfide from gas phase. Lastly, Pham Minh et al [38] conducted the similar research based on calcium phosphate-based materials starting from calcium carbonate and orthophosphoric acid for the removal of lead(II) from an aqueous solution.…”

Section: Discussionmentioning

confidence: 99%

Laboratory-scale investigation of the removal of hydrogen sulfide from biogas and air using industrial waste-based sorbents

Awe

Minh

Lyczko

et al. 2017

Journal of Environmental Chemical Engineering

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Biogas is a valuable renewable energy that can be used as a fuel or as raw material for the production of hydrogen, synthesis gas and chemicals. Apart from its main constituent of CH 4 and CO 2 , it also contained various undesirable contaminants. The removal of these contaminants such as H 2 S will significantly improve the quality of the biogas for further use. This work involved the valorization of calcium carbonate (CaCO 3)-based solid wastes for the removal of H 2 S from the biogas stream. The solid wastes were analyzed by different physicochemical methods CaCO 3 was found as the main component of both solid wastes, while trace amounts of other elements such as Mg, Al, etc. were also present. The solid wastes were dispersed in water and the resulted suspensions were tested for the removal of H 2 S from the gas phase, using a triphasic gas/liquid/solid glass reactor at room temperature and pressure. A commercial activated carbon (AC) and a pure commercial calcite were also used for comparison purpose. In addition, mixtures of AC with CaCO 3 waste in different ratios were also tested. The influence of the matrix of gas (air or biogas) on the removal of H 2 S was evaluated. Both solid wastes showed higher performance compared to the pure commercial calcite for H 2 S removal. The coupling of a CaCO 3 waste and AC allowed improving the sorption performance compared to pure commercial CaCO 3 and AC used alone. The results obtained open a new promising way for the valorization of CaCO 3-based wastes for H 2 S removal from biogas.

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“…Many of the adsorbents have been investigated for gas desulphurization, such as zeolite [23], activated carbons [24][25][26][27][28], metal oxides supported by mesoporous silica [29], graphite oxide [30], hydroxyapatite [31] and functionalized activated carbon [32]. Furthermore, specific modifications of the adsorbents are normally required to improve the adsorption efficiency which are not environmentally friendly and also increase the cost of the adsorbents [33], such as caustic or metal impregnation [32,34,35].…”

Section: Introductionmentioning

confidence: 99%

Study of H2S Removal Capability from Simulated Biogas by Using Waste-Derived Adsorbent Materials

et al. 2020

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Three waste-derived adsorbent materials (wood-derived biochar, sludge-derived activated carbon and activated ash) were pre-activated at the laboratory scale to apply them for the removal of H2S from a biogas stream. The H2S removal capabilities of each material were measured by a mass spectrometer, to detect the H2S concentration after the adsorption in an ambient environment. The activated ash adsorbent has the highest removal capacity at 3.22 mgH2S g−1, while wood-derived biochar has slightly lower H2S removal capability (2.2 mgH2S g−1). The physicochemical properties of pristine and spent materials were characterized by the thermogravimetric analyzer, elemental analysis, X-ray fluorescence spectroscopy and N2 adsorption and desorption. Wood-derived biochar is a highly porous material that adsorbs H2S by physical adsorption of the mesoporous structure. Activated ash is a non-porous material which adsorbs H2S by the reaction between the alkaline compositions and H2S. This study shows the great potential to apply waste-derived adsorbent materials to purify a biogas stream by removing H2S.

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Metal-doped apatitic calcium phosphates: preparation, characterization, and reactivity in the removal of hydrogen sulfide from gas phase

Cited by 4 publications

References 34 publications

H2S removal from syngas using wastes pyrolysis chars

H2S removal from syngas using wastes pyrolysis chars

Laboratory-scale investigation of the removal of hydrogen sulfide from biogas and air using industrial waste-based sorbents

Study of H2S Removal Capability from Simulated Biogas by Using Waste-Derived Adsorbent Materials

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