Hydrogen adsorption on activated carbons prepared from olive waste: effect of activation conditions on uptakes and adsorption energies

Melouki, Redouane; Llewellyn, Philip L.; Tazibet, S.; Boucheffa, Y.

doi:10.1007/s10934-016-0230-z

Cited by 13 publications

(8 citation statements)

References 49 publications

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“…The constant regression terms are simply and . The primary weakness of the Temkin model is failure at the low and high pressure extremes due the logarithmic dependence. , …”

Section: Resultsmentioning

confidence: 99%

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Characterization of Activated Carbons Prepared from Almond Shells and Their Hydrogen Storage Properties

Bi̇ci̇l

Doğan

2021

Energy Fuels

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In this study, activated carbons with a well-developed porous structure and high surface area were prepared from almond shells by chemical activation using zinc chloride and microwave irradiation methods under a nitrogen atmosphere. The effects of microwave irradiation times, powers, agent ratios on pore volumes, and BET surface areas of the activated carbons were investigated. Pore volumes and BET surface areas of the activated carbons were determined using a BET surface area device; surface functional groups using an FTIR-ATR spectroscope; surface morphology using an SEM/EDX device; and hydrogen storage capacities using an IMI PSI gas storage device. Both the BET surface areas and total pore volumes of activated carbons with increasing microwave irradiation time, power, and agent ratio increased. Experimental studies showed that AC600 with the highest BET surface area (1307 m2/g) and total pore volume (1.66 cc/g) had the highest hydrogen storage capacity (2.53 wt %) at 77 K. FTIR-ATR and SEM analyses indicated that the morphology of the almond shell changed with ZnCl2 activation and the microwave process and it transformed into a carbon-like structure. The hydrogen storage capacity of activated carbons at cryogenic temperature was higher than that at room temperature. The adsorption data were correlated reasonably well by Freundlich adsorption isotherms.

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“…The constant regression terms are simply and . The primary weakness of the Temkin model is failure at the low and high pressure extremes due the logarithmic dependence. , …”

Section: Resultsmentioning

confidence: 99%

“…The primary weakness of the Temkin model is failure at the low and high pressure extremes due the logarithmic dependence. 60,61 In contrast to the Temkin model, the Freundlich model attempts to account for surface heterogeneity with a logarithmic energy distribution function. Adsorbed molecules react with each other.…”

Section: Characterization Of Activatedmentioning

confidence: 99%

Characterization of Activated Carbons Prepared from Almond Shells and Their Hydrogen Storage Properties

Bi̇ci̇l

Doğan

2021

Energy Fuels

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“…Melouki et al. 110 described the fabrication of olive waste cake‐derived activated carbon employing ZnCl 2 ‐ and H 3 PO 4 ‐mediated chemical activation processes. Comparing these two chemical activation processes, ZnCl 2 ‐enabled activation resulted in a high specific surface area, which was 30 % larger than that by H 3 PO 4 ‐mediated activated carbon.…”

Section: Oil Cake‐based Biocarbon Materialsmentioning

confidence: 99%

Oil Cakes as Sustainable Agro‐Industrial Feedstock for Biocarbon Materials

Sankari¹,

Vivekanandhan²,

Misra

et al. 2021

ChemBioEng Reviews

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The demand for vegetable oil is increasing for both food and non‐food applications, which leads to the generation of a huge amount of oil cakes. The rising annual production requires alternative applications for sustainable operations of oil mills, especially those involved in non‐edible oil production. Hence, the value‐added uses of oil cakes such as environment remediation (metal absorption), composite fabrication (as fillers, reinforcements), nanoparticle synthesis (as reducing and stabilizing agent), and production of carbonaceous materials (as carbon source) were extensively explored in recent years. Among them, the thermochemical conversion of oil cakes into carbonaceous materials (biochar and activated carbon) received great interest as the demand for biocarbon materials increases exponentially. Oil cake‐derived biocarbon materials found a wide range of technological applications. With this perspective, recent developments in oil cake‐derived carbon materials and their diverse applications are reviewed.

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“…One of the most important advantages of ACs is that they can be produced from a wide variety of low-cost and renewable raw materials, such as agricultural waste or lignocellulosic materials in general, which is an important advantage compared to other carbon materials [104]. The synthesis of ACs consists in the carbonization of a precursor and the subsequent or simultaneous activation process, which can be either physical [105,106] or chemical [58,100,107,108]. Physical activation is based on the gasification at high temperature of the precursor in a stream of CO 2 or H 2 O, whereas chemical activation consists of heating in air or under inert gas the precursor impregnated with a crosslinker/dehydrating agent (H 3 PO 4 ) or mixed with an oxidizing agent (NaOH, KOH, etc.).…”

Section: Activated Carbonsmentioning

confidence: 99%

Characterization of Carbon Materials for Hydrogen Storage and Compression

Sdanghi

Canevesi

Celzard

et al. 2020

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Carbon materials have proven to be a suitable choice for hydrogen storage and, recently, for hydrogen compression. Their developed textural properties, such as large surface area and high microporosity, are essential features for hydrogen adsorption. In this work, we first review recent advances in the physisorption characterization of nanoporous carbon materials. Among them, approaches based on the density functional theory are considered now standard methods for obtaining a reliable assessment of the pore size distribution (PSD) over the whole range from narrow micropores to mesopores. Both a high surface area and ultramicropores (pore width < 0.7 nm) are needed to achieve significant hydrogen adsorption at pressures below 1 MPa and 77 K. However, due to the wide PSD typical of activated carbons, it follows from an extensive literature review that pressures above 3 MP are needed to reach maximum excess uptakes in the range of ca. 7 wt.%. Finally, we present the adsorption–desorption compression technology, allowing hydrogen to be compressed at 70 MPa by cooling/heating cycles between 77 and 298 K, and being an alternative to mechanical compressors. The cyclic, thermally driven hydrogen compression might open a new scenario within the vast field of hydrogen applications.

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Hydrogen adsorption on activated carbons prepared from olive waste: effect of activation conditions on uptakes and adsorption energies

Abstract: International audienc

Cited by 13 publications

References 49 publications

Characterization of Activated Carbons Prepared from Almond Shells and Their Hydrogen Storage Properties

Characterization of Activated Carbons Prepared from Almond Shells and Their Hydrogen Storage Properties

Oil Cakes as Sustainable Agro‐Industrial Feedstock for Biocarbon Materials

Characterization of Carbon Materials for Hydrogen Storage and Compression

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