How inorganic elements of biomass influence char steam gasification kinetics

Dupont, Capucine; Jacob, Sylvain; Marrakchy, Khalil Ould; Hognon, Céline; Grateau, Maguelone; Labalette, Françoise; Perez, Denilson da Silva

doi:10.1016/j.energy.2016.04.094

Cited by 114 publications

(82 citation statements)

References 13 publications

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“…While the oxygenation process did not modify significantly the elemental composition of the chars, steam activation strongly increased the ash content of ac.FW/CFS (relative increase: 12.4 wt%) and decreased the carbon concentration (relative decrease: 11.5 wt%). This is explained by the gasification reaction of the carbonaceous matrix with steam catalysed by the mineral species of c.FW/CFS during the activation step [46].…”

Section: Sorbents Characterizationmentioning

confidence: 99%

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: Sorbents Characterizationmentioning

confidence: 99%

H2S removal from syngas using wastes pyrolysis chars

Hervy

Minh

Gérente

et al. 2018

Chemical Engineering Journal

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“…Pyrolysis kinetic parameters were taken from Di Blasi's review [30]: results were calculated both for the fastest [31] and the slowest [32] laws. For gasification, a law taking into account biomass composition was chosen [18]. Among a fast-reacting biomass, alfalfa, and a slow reacting one, barley straw were chosen for comparison.…”

Section: Definition Of Characteristic Timementioning

confidence: 99%

“…The focus is made on the gasification step in Figure 7 and presented as a solid conversion and as a function of time. Three families of behavior can be identified, which is identified in literature [18]:…”

Section: Influence Of Biomass Typementioning

confidence: 99%

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The Influence of Char Preparation and Biomass Type on Char Steam Gasification Kinetics

et al. 2018

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A study was conducted to investigate the parameter that has influence on steam gasification kinetics between the biomass type and char preparation. Thermogravimetric analysis (TGA) was carried out on steam gasification of seven biomass samples as well as chars from three of these samples. Chars were prepared using three different sets of low heating rate (LHR) pyrolysis conditions including temperature and biomass bed geometry. It was shown by a characteristic time analysis that these pyrolysis conditions were not associated with a chemical regime in a large amount of devices. However, it has been shown experimentally that conditions used to prepare the char had a much lower influence on steam gasification kinetics than the biomass type.

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“…The steam gasification kinetics of chars from different biomasses has been investigated, and inorganic elements have significant influence on reaction kinetics , . Studies have shown that the structure of biochar contains abundant AAEM species, which can significantly influence gasification reactions by acting as inherent catalysts in the biochar , .…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Structure of the Biochar Obtained by Slow Pyrolysis of Elephant Grass during Its Steam Gasification

et al. 2019

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A detailed evaluation of the structure of biochar from slow pyrolysis of elephant grass during its steam gasification was performed. The effects of surface area and inherent alkali and alkaline earth metal (AAEM) species on the reactivity of the biochar were investigated. Drastic changes in biochar structure occurred throughout the reaction, especially for low degrees of conversion. The BET surface area of the biochar increased significantly until the conversion reached 0.49, and there was a steep decrease at high degrees of conversion. The biochar showed a high AAEM concentration. The aromaticity of the biochar suggested an ordered carbon structure that can lower the reaction rate. The high syngas yield makes the process attractive for generation of renewable energy.

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How inorganic elements of biomass influence char steam gasification kinetics

Cited by 114 publications

References 13 publications

H2S removal from syngas using wastes pyrolysis chars

H2S removal from syngas using wastes pyrolysis chars

The Influence of Char Preparation and Biomass Type on Char Steam Gasification Kinetics

Investigation of the Structure of the Biochar Obtained by Slow Pyrolysis of Elephant Grass during Its Steam Gasification

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