CO2 activation of chars: Effect of burn-off on texture and fractal properties

Mahamud, Manuel María; Menéndez, Juan María; Sarquis, Pedro

doi:10.1016/j.fuproc.2013.10.009

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Activation Of Uc1

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Cited by 10 publications

(1 citation statement)

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“…Activation with CO 2 can also be used [193,222,223] under the above conditions (850-900°C, 1-2 h) but the same time generally provides lower surface areas when compared to steam.…”

Section: Activation Of Ucmentioning

confidence: 99%

Unburned carbon from coal combustion ash: An overview

Bartoňová

2015

Fuel Processing Technology

141

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“…Activation with CO 2 can also be used [193,222,223] under the above conditions (850-900°C, 1-2 h) but the same time generally provides lower surface areas when compared to steam.…”

Section: Activation Of Ucmentioning

confidence: 99%

Unburned carbon from coal combustion ash: An overview

Bartoňová

2015

Fuel Processing Technology

141

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New insights into the chemical activation of lignins and tannins using K2CO3—a combined thermoanalytical and structural study

Guizani,

Widsten,

Siipola

et al. 2023

Carbon Lett.

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Engineering of activated carbons (ACs) through chemical activation of organic precursors has been extensively studied for a wide variety of biopolymers, biomasses, wastes and other fossil-based precursors. Despite huge efforts to engineer evermore performant and sustainable ACs, “searching-for-the-best-recipe” type of studies are more the rule than the exception in the published literature. Emerging AC applications related to energy and gas storage require strict control of the AC properties and a better understanding of the fundamentals underlying their engineering. In this study, we provide new insights into the K2CO3 chemical activation of plant-based polyphenols—lignins and tannins—through careful thermoanalytical and structural analyses. We showed for the the first time that the reactivity of polyphenols during K2CO3 chemical activation depends remarkably on their purity and structural properties, such as their content of inorganics, OH functionalities and average molecular weight. We also found that the burn-off level is proportional to the K2CO3/lignin impregnation ratio (IR), but only within a certain range—high impregnation ratios are not needed, unlike often reported in the literature. Furthermore, we showed for the first time that the K2CO3 chemical activation of different carbon surfaces from lignins and tannins can be modelled using simple global solid-state decomposition kinetics. The identified activation energies lay in the range of values reported for heterogenous gas-carbon surface gasification reactions (O2-C, H2O-C, or CO2-C) in which the decomposition of C(O) surface complexes is the common rate-limiting step.

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Fractal Characteristics of Pore Structures in GGBFS-based Cement Pastes

Kim

Choi

2018

Applied Surface Science

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CO2 activation of chars: Effect of burn-off on texture and fractal properties

Cited by 10 publications

References 34 publications

Unburned carbon from coal combustion ash: An overview

Unburned carbon from coal combustion ash: An overview

New insights into the chemical activation of lignins and tannins using K2CO3—a combined thermoanalytical and structural study

Fractal Characteristics of Pore Structures in GGBFS-based Cement Pastes

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