A study of ignition of metal impregnated carbons: the influence of oxygen content in the activated carbon matrix

Merwe, M.M. van der; Bandosz, Teresa J.

doi:10.1016/j.jcis.2004.08.056

Cited by 16 publications

(6 citation statements)

References 16 publications

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“…The influence of potassium on the reactivity of the coconut-based materials explains the deviation observed in Figure . In agreement with our results, the experimental work of Van der Merwe and Bandosz showed that the coconut shell activated carbons are susceptible to ignition reactions when compared to the peat-based activated carbons have a greater propensity to oxidation and self-ignition than peat based activated carbons. This is attributed to the highest amount of mineral matters present in the coconut-based samples resulting from the activation and neutralization process encountered during their manufacture. , Mineral matters like potassium are supposed to provide a direct catalytic activity, which depends on the amount of minerals present, their chemical form and the degree of dispersion …”

Section: Resultssupporting

confidence: 92%

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Material Properties Influencing the Oxidation and Ignition Reactivity of Activated Carbons: Thermal Analysis, HRTEM Study, and Statistical Modeling

Jayabalan¹,

Pré²,

Hequet³

et al. 2009

Energy Fuels

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The aim of this work is to understand the influence of textural, chemical, and structural properties on the reactivity of activated carbons toward air. Multiscale organization of activated carbons was studied using high-resolution transmission electron microscopy (HRTEM) and their quantitative structural data, like individual fringe length, interlayer spacing, and proportion of nonstacked layers, were extracted using a specific image analysis procedure. Intrinsic properties like the specific surface area S BET, pore volume, micropore width, and elementary composition were also measured. The reactivity of the carbon samples in air was quantified from the measurement of oxidation and ignition temperatures determined by thermogravimetry analysis coupled with a differential scanning calorimetry. The characteristics of the graphitic structures and the properties of the activated carbon materials were found to be dependent on the activation mode and the nature of the material. The results suggest that oxygen present in the form of surface oxygenated groups, the mineral content, and the dimensions of the basic structural units influence the reactivity of activated carbons. Highly stable carbons were found to contain less oxygen to carbon ratio, lower mineral content, and larger and better stacked polyaromatic layers.

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Section: Resultssupporting

confidence: 92%

“…These materials have lower PIO values than expected. Many reasons can be attributed for this behavior: higher affinity for the chemisorption of oxygen in air and especially high potassium content in these samples, acting as a catalyst of the oxidation reactions may explain the excessive reactivity of the materials …”

Section: Resultsmentioning

confidence: 99%

Material Properties Influencing the Oxidation and Ignition Reactivity of Activated Carbons: Thermal Analysis, HRTEM Study, and Statistical Modeling

Jayabalan¹,

Pré²,

Hequet³

et al. 2009

Energy Fuels

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“…In all cases, adding copper catalyzes ignition because the temperature of the exotherm decreases and that decrease is up to 100 °C. Overall, the silica−nitrogen-containing carbon composites burn at about 500 °C, which is slightly higher than for the average activated carbon …”

Section: Resultsmentioning

confidence: 88%

Silica−Polyamine-Based Carbon Composite Adsorbents as Media for Effective Hydrogen Sulfide Adsorption/Oxidation

et al. 2007

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New silica-carbon adsorbents were prepared by pyrolysis of silica-polyamine composites at 600 °C. The heat treatment was expected to activate nitrogen for effective hydrogen sulfide oxidation. Moreover, the same pyrolysis treatment was applied on silica-polyamine adsorbents previously used to remove copper ions for aqueous solution. The performance of these materials as H 2 S adsorbents was tested using a home-developed dynamic breakthrough test. Samples from before and after the adsorption process were characterized by adsorption of nitrogen, surface pH, thermal analysis, elemental analysis, FTIR, optical microscopy, and solid-state CPMAS 13 C NMR. Differences in the performance were linked to the surface properties such as content of nitrogen, content of copper, surface acidity/basicity, and porous structure. It was found that the capacity for hydrogen sulfide removal/selectivity for oxidation to sulfur depends on the granulation of the silica matrix, the kind of polymer used for grafting, surface basicity, and porosity. Thermal transformation of the polymer causes the formation of new highly dispersed catalytic centers with active nitrogen atoms. The silica matrix also provides pore space for the storage of oxidation products, mainly elemental sulfur.

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“…This might be related to the high surface area and thus thin pore walls of the former sample and its low oxygen content. As indicated by Van der Merwe et al [41], low-oxygen content carbon ignites at a lower temperature than high oxygen-content carbons owing to its affinity to react with O 2 with a release of heat. A marked population of carbon edges in highly porous carbons also results more reaction centers for those reactions.…”

Section: Carbon Surface Characterizationmentioning

confidence: 93%

Inorganic matter in rice husk derived carbon and its effect on the capacitive performance

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Bandosz

2021

Journal of Energy Chemistry

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A study of ignition of metal impregnated carbons: the influence of oxygen content in the activated carbon matrix

Cited by 16 publications

References 16 publications

Material Properties Influencing the Oxidation and Ignition Reactivity of Activated Carbons: Thermal Analysis, HRTEM Study, and Statistical Modeling

Material Properties Influencing the Oxidation and Ignition Reactivity of Activated Carbons: Thermal Analysis, HRTEM Study, and Statistical Modeling

Silica−Polyamine-Based Carbon Composite Adsorbents as Media for Effective Hydrogen Sulfide Adsorption/Oxidation

Inorganic matter in rice husk derived carbon and its effect on the capacitive performance

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