Comparing the performance of a 13X zeolite and an impregnated activated carbon for H2S removal from biogas to fuel an SOFC: Influence of water

Sigot, Léa; Obis, Marta Fontseré; Benbelkacem, Hassen; Germain, Patrick; Ducom, Gäelle

doi:10.1016/j.ijhydene.2016.08.100

Cited by 49 publications

(47 citation statements)

References 35 publications

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“…Nowadays, chars are considered as wastes and the additional costs required for their disposal decrease the economic viability of the pyrogasification process. For this reason, new routes for char valorization are studied: soil amendment and fertilizer [3], sorbent for water treatment [4] and gas cleaning [5], catalyst [6,7] and catalyst support [8] for gas treatment. The syngas produced by pyrogasification is mainly composed of permanent gases, such CO, H 2 , CO 2 , CH 4 and small hydrocarbons (C 2 -C 3 ).…”

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

104

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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: Introductionmentioning

confidence: 99%

“…Few studies compared the H 2 S removal efficiency of activated carbon in moist and dry conditions and revealed that humidity strongly promoted the adsorption efficiency of activated carbon [5,24,36]. The reaction mechanism in dry atmosphere with zeolite has recently been investigated [12], but still remains unclear with activated carbons.…”

Section: Introductionmentioning

confidence: 99%

H2S removal from syngas using wastes pyrolysis chars

Hervy

Minh

Gérente

et al. 2018

Chemical Engineering Journal

104

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“…Bubbling the gas through the NH 3 /H 2 O mixture generates humidity in the feed gas and the zeolite could lose adsorption ability by condensation in the pores. A significant degradation of the zeolite performance by the presence of humidity in the gas is also reported in literature [27].…”

Section: Cuo-doped Zeolitementioning

confidence: 99%

Investigation of NH₃ Influence on Adsorptive H₂S Removal from Biogas for Solid Oxide Fuel Cell Application

Weinlaender

Neubauer

Hauth

et al. 2018

Chemie Ingenieur Technik

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The generation of electrical energy from biogas is state of the art. One option is the application of fuel cells for generating electrical energy. Due to their construction, the materials used and their mode of operation, solid oxide fuel cells (SOFCs) are particularly suitable. The primary problem in the operation of SOFCs using biogas is H2S. The goal of this work is to investigate the possible effects of ammonia on different sorbents that have already successfully been used for the desulfurization of biogas. The H2S adsorption capacity of four commercially available sorbents in the presence of NH3 was investigated as well as the influence of an upstream NH3 removal. The CuO‐MnO‐based sorbent showed the best performance related to sulfur uptake.

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“…The paper presents a study of synthesis cobalt oxide dispersed on high-quality polymer-derived nanoporous carbon as an alternative method for controlling ethylene concentration in the atmosphere of packaging and storage systems. Porous carbon was selected due to its superiority in high content loading purposes compared to porous alumina or clay [16], and its lower affinity toward water than zeolite [17]. The preparation of material supports is the first step in the process development, which is then followed by characterization of the adsorbent in terms of its surface and ethylene adsorption properties.…”

Section: Introductionmentioning

confidence: 99%

Ethylene Adsorption Using Cobalt Oxide-Loaded Polymer-Derived Nanoporous Carbon and Its Application to Extend Shelf Life of Fruit

2019

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Suppressing the amount of ethylene during storage has been of interest as a method to enhance shelf life of fruit. In this work, ethylene removal by adsorption using cobalt oxide-impregnated nanoporous carbon has been studied. Nanoporous carbon with a high surface area up to 2400 m2 g−1 was prepared by carbonization process biomass and synthetic polymer at 850 °C. Dispersion of cobalt oxide on porous carbon surface was carried out by an incipient wetness procedure followed by calcination process at 200 °C. Ethylene adsorption test was performed using a volumetric method in an ultrahigh vacuum rig constructed by Swagelok VCR® fittings. The results showed that the cobalt oxide/carbon system had significant ethylene adsorption capacity. Ethylene uptake increases with the increasing cobalt oxide loading on the carbon. The highest ethylene capacity of 16 mol kg−1 adsorbent was obtained by using 30 wt.% (weight percentage) of cobalt oxide dispersed in polymer-derived carbon. In closed storage, the ratio of 15 g adsorbent/kg fruit may extend the storage life up to 12 d, higher than that without adsorbent (3 d). Therefore, the results demonstrate the great potential use of cobalt oxide-impregnated nanoporous carbon as an adsorbent for ethylene removal during storage of fruit.

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Comparing the performance of a 13X zeolite and an impregnated activated carbon for H2S removal from biogas to fuel an SOFC: Influence of water

Cited by 49 publications

References 35 publications

H2S removal from syngas using wastes pyrolysis chars

H2S removal from syngas using wastes pyrolysis chars

Investigation of NH₃ Influence on Adsorptive H₂S Removal from Biogas for Solid Oxide Fuel Cell Application

Ethylene Adsorption Using Cobalt Oxide-Loaded Polymer-Derived Nanoporous Carbon and Its Application to Extend Shelf Life of Fruit

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Comparing the performance of a 13X zeolite and an impregnated activated carbon for H2S removal from biogas to fuel an SOFC: Influence of water

Cited by 49 publications

References 35 publications

H2S removal from syngas using wastes pyrolysis chars

H2S removal from syngas using wastes pyrolysis chars

Investigation of NH3 Influence on Adsorptive H2S Removal from Biogas for Solid Oxide Fuel Cell Application

Ethylene Adsorption Using Cobalt Oxide-Loaded Polymer-Derived Nanoporous Carbon and Its Application to Extend Shelf Life of Fruit

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Investigation of NH₃ Influence on Adsorptive H₂S Removal from Biogas for Solid Oxide Fuel Cell Application