Adsorptive removal of H 2 S in biogas conditions for high temperature fuel cell systems

Sisani, Elena; Cinti, Giovanni; Discepoli, Gabriele; Penchini, Daniele; Desideri, Umberto; Marmottini, Fabio

doi:10.1016/j.ijhydene.2014.07.173

Cited by 71 publications

(63 citation statements)

References 37 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%

“…The gas composition had no notable impact on the removal capacity of ac.UWP which was almost stable at 12-13 mg H2S .g , respectively). While previous studies showed that CO 2 had a detrimental effect on the biogas desulfurization efficiency of activated carbons [21,32], this result proved that no competitive adsorption occurred between the H 2 S and the CO 2 from the syngas, which are two acid gases. This result was confirmed by the µ-GC analysis of the syngas at the fixed bed outlet during the H 2 S removal tests.…”

Section: Effect Of the Gas Composition On H 2 S Removal Efficiencymentioning

confidence: 67%

“…In addition, the use of carbonaceous materials for syngas desulfurization at ambient temperature has, to the best of our knowledge, never been studied. Some researchers worked on H 2 S removal from biogas and highlighted that the presence of CO 2 in the gas matrix negatively affected the activated carbons efficiency due to competitive effects with H 2 S [21,32]. As CO 2 concentration in the syngas ranges from 5 to 20%, similar phenomenon can be observed.…”

Section: Introductionmentioning

confidence: 89%

“…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: Effect Of the Gas Composition On H 2 S Removal Efficiencymentioning

confidence: 67%

Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

H2S removal from syngas using wastes pyrolysis chars

Hervy

Minh

Gérente

et al. 2018

Chemical Engineering Journal

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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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Biodesulfurization of Natural Gas

2018

Biodesulfurization in Petroleum Refining

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Adsorptive removal of H 2 S in biogas conditions for high temperature fuel cell systems

Cited by 71 publications

References 37 publications

H2S removal from syngas using wastes pyrolysis chars

H2S removal from syngas using wastes pyrolysis chars

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

Biodesulfurization of Natural Gas

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