Activated carbons from materials of varying morphological structure

Mortley, Quamie; Mellowes, W.A.; Thomas, Sabu

doi:10.1016/0040-6031(88)87334-9

Cited by 21 publications

(11 citation statements)

References 20 publications

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“…The sample chemical composition and heating value are presented in Table 1 as an average of three replicates. Molecular composition of the biomasses is referred to literature reported values [27][28][29].…”

Section: Methodsmentioning

confidence: 99%

Kinetic Analysis of Tropical Lignocellulosic Agrowaste Pyrolysis

2017

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The thermal behavior of three Colombian agricultural residues was studied by non-isothermal thermogravimetric analysis (TGA) at various heating rates. An approach using a combined kinetics parallel reaction model and model-free isoconversional methods proved to be suitable to determine the pyrolysis kinetic parameters of biomasses with different macromolecular composition and H/C and O/C ratios near 1.5 and 0.8, respectively. Fraser-Suzuki functions representing the derivative TGA (DTG) of hemicellulose, cellulose and lignin showed a very good agreement with the experimental data. The calculated apparent activation energy of biomass pseudocomponents evidenced no dependence on the reaction extent in all the conversion range, validating the use of master plots for decomposition mechanism identification. Pseudo-hemicellulose, pseudo-cellulose, and pseudo-lignin showed to be close to a second-order kinetic model, a random scission, or an Avrami-Erofeev model and a high-order kinetic model, respectively. Comparing the three feedstocks, the apparent activation energy of the pseudo-components was in the order: bamboo guadua E a < coconut shells E a < oil palm shells E a. The results show that even when sample elemental composition is very similar, macromolecular constituents, in particular lignin, could have an impact in the biomass decomposition rate and apparent activation energy. For the three studied materials, the model fitting error below 10% showed that the calculated kinetic parameters are suitable for the description and prediction of the biomass thermal decomposition.

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Section: Methodsmentioning

confidence: 99%

Kinetic Analysis of Tropical Lignocellulosic Agrowaste Pyrolysis

2017

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“…The origin of selected samples has been detailed on a previous work [18]. The chemical composition of the biomasses was determined according to the standards of solid biofuels with at least three replicates, and is presented in Tables 1 and 2. Elemental composition (C, H, N, S, and O) was determined using a [19][20][21].…”

Section: Biomass Samplesmentioning

confidence: 99%

Steam gasification behavior of tropical agrowaste: A new modeling approach based on the inorganic composition

Millán

Vargas

Nzihou

2019

Fuel

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The steam gasification and co-gasification reactivity and kinetics of coconut shells, oil palm shells and bamboo guadua were studied from an isothermal thermogravimetric analysis, with temperatures ranging from 750°C to 900°C, and steam partial pressures from 3 to 10 kPa. In the analyzed experimental range, inorganics were identified as the most influential parameter in biomass reactivity and kinetics. Accordingly, a new modeling approach is proposed to predict the gasification behavior of lignocellulosic agrowaste based on their inorganic composition. A good agreement between the experimental and modeled data was found, showing that the proposed approach is suitable for the description and prediction of the gasification behavior of biomasses with different macromolecular structure and within a wide range of inorganic composition, and H/C and O/C ratios near 1.5 and 0.8 respectively. This kinetic model could constitute a valuable tool for reactor design and scale-up of steam gasification facilities using tropical lignocellulosic feedstocks.

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“…The main studied precursors are wood (Amaya et al, 2007;Benaddi et al, 1998;Byrne and Nagle, 1997), almond shells (Marcilla et al, 2000;Rodriguez-Reinoso et al, 1982, 1984, olive stones (Caballero et al, 1997;Gonzalez et al, 1997;Zabaniotou et al, 2008), coconut shells (Cagnon et al, 2003;Daud and Ali, 2004;Mortley et al, 1988), peach (Molina-Sabio et al, 1995;Rodriguez-Reinoso et al, 1985), apricot stones (Gergova et al, 1993), and apple pulp (Fernandez et al, 2001;Suarez-Garcia et al, 2002). It has been already extensively demonstrated that the microporous properties of activated carbons depend not only on the experimental conditions of the carbonization and activation steps but also preponderantly on the original nature and structure of the involved precursor.…”

Section: Introductionmentioning

confidence: 99%

Contributions of hemicellulose, cellulose and lignin to the mass and the porous properties of chars and steam activated carbons from various lignocellulosic precursors

Cagnon¹,

Py²,

Guillot³

et al. 2009

Bioresource Technology

361

143

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a b s t r a c tIn this study, contributions of hemicellulose, cellulose and lignin to the mass and the porous properties of chars and activated carbons from various lignocellulosic materials were studied. A predictive calculation was established using the experimental results obtained for the three components separately to evaluate the carbonization and activation yields and their respective contributions to the chars and to the subsequent activated carbons of various precursors in term of weight fraction. These equations were validated. The results showed that lignin can be considering as being the major contributor of all chars and activated carbons. Besides, the evolution of the mean pore size versus the specific porous volume showed that each component contributes to the porosity of chars and activated carbons whatever is its weight contribution.

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Activated carbons from materials of varying morphological structure

Cited by 21 publications

References 20 publications

Kinetic Analysis of Tropical Lignocellulosic Agrowaste Pyrolysis

Kinetic Analysis of Tropical Lignocellulosic Agrowaste Pyrolysis

Steam gasification behavior of tropical agrowaste: A new modeling approach based on the inorganic composition

Contributions of hemicellulose, cellulose and lignin to the mass and the porous properties of chars and steam activated carbons from various lignocellulosic precursors

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