Novel mesoporous silica supported ZnO adsorbents for the desulphurization of biogas at low temperatures

Hussain, Murid; Abbas, Naseem; Fino, Debora; Russo, Nunzio

doi:10.1016/j.cej.2012.02.034

Cited by 100 publications

(52 citation statements)

References 30 publications

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“…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%

H2S removal from syngas using wastes pyrolysis chars

Hervy

Minh

Gérente

et al. 2018

Chemical Engineering Journal

105

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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%

H2S removal from syngas using wastes pyrolysis chars

Hervy

Minh

Gérente

et al. 2018

Chemical Engineering Journal

105

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“…The mesoporous silica materials (SBA-15-S, KIT-6) were obtained by following the procedure shown in recent works [32,34,35]. After a hydrothermal treatment, the obtained solid product was filtered, dried and/or calcined at 550°C for 5 h, and was then utilized to prepare Ti-SBA-15-S (dried or calcined) and Ti-KIT-6 (dried or calcined).…”

Section: Synthesis Of the Ti-mesoporous Silica Photocatalystsmentioning

confidence: 99%

“…Korea Advanced Institute of Science and Technology-6 (KIT-6) silica is another charming material with 3-dimensional (large-pore gyroid cubic Ia3d) pore structure. These materials have already received attention of many researchers for various applications [32,34,35].…”

Section: Introductionmentioning

confidence: 99%

New optimized mesoporous silica incorporated isolated Ti materials towards improved photocatalytic reduction of carbon dioxide to renewable fuels

Hussain

Akhter

Russo

et al. 2015

Chemical Engineering Journal

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“…The authors also showed that SBA-15 and SBA-F-15-S impregnated with ZnO showed a higher desulfurization efficiency than the impregnated MCM-41 and KIT-6, as well as the activated carbon-based adsorbent, ROZ3. Hussain et al in their studies obtained biogas with H 2 S concentrations below 1 ppmv and a desulfurization efficiency over 99%, at ambient temperature [30]. Also, silica xerogels can be used in biogas desulfurization processes after their modification with amino groups, triamines (TRI), or polyethyleneimines (PEI) [31].…”

Section: Sorbents Used For Biogas Desulfurizationmentioning

confidence: 99%

“…Hussain et al [30] carried out biogas desulfurization using a mesoporous silica impregnated with zinc oxide in an amount of 10, 15, and 20 wt%. The impregnation was carried out using a dry method, otherwise known as a capillary method (incipient wetness impregnation, or IWI), with the following commercial silica adsorbents: MCM-41, KIT-6, SBA-15-spherical (SBA-15-S) and SBA-15 Fibrous (SBA -15-F).…”

Section: Sorbents Used For Biogas Desulfurizationmentioning

confidence: 99%