Preparation of activated carbon from empty fruit bunch for hydrogen storage

Hydrogen storage in activated carbons (ACs) has proven to be a realistic alternative to compression and liquefaction. Adsorption capacities up to 5.8 wt.% have indeed been obtained. The amount of adsorbed hydrogen depends on the textural properties of ACs, such as specific surface area and total pore volume. The modified Dubinin-Astakhov (MDA) equation proved to be a good analytical tool for describing hydrogen adsorption in a wide range of pressures and temperatures and for several adsorbents. The parameters of this model have been found to be somehow related to the textural properties of the adsorbent. Thus, we applied this model to understand better hydrogen adsorption on ACs over a wide range of pressures in relation to the textural properties of the ACs. We applied the MDA equation to evaluate also the isosteric heat of hydrogen adsorption, which was found to be in the range of 5 to 9 kJ mol-1. We compared the results obtained by applying the MDA equation with those obtained by both the sorption isosteric method and the Sips equation. This allowed finding the temperature dependence of the isosteric heat of adsorption, as well as its variation with respect to the textural properties of the ACs.

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“…a) Increase of maximum of hydrogen excess adsorption with A BET and b) maximum of excess adsorption isotherms[63,[65][66][67][68][69][70] …”

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confidence: 99%

Application of the modified Dubinin-Astakhov equation for a better understanding of high-pressure hydrogen adsorption on activated carbons

Sdanghi

Schaefer

Maranzana

et al. 2020

International Journal of Hydrogen Energy

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“…For this reason, activated carbons are extensively used as optimum adsorbent materials. Numerous types of activated carbons (especially derived from fruit peels) are produced in the last years focusing on the improvement of adsorption capacity given that the cost is kept low [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Zero-Cost Agricultural Wastes as Sources for Activated Carbons Synthesis: Lead Ions Removal from Wastewaters

Kyzas

Mitropoulos

2018

EWaS3 2018

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Abstract:In the present study, activated carbons (PAC) were hydrothermally prepared with an environmental friendly preparation route after pyrolysis from biomass (specifically from agricultural (potato) peels). The prepared biochars were activated with potassium hydroxide (chemical activities). The preparation route had a strong impact on the pore structure of PAC. In addition, surface chemistry was also affected by the preparation and activation process. The adsorbent materials were also characterized by Scanning Electron Microscopy. The prepared activated carbons were used as adsorbents for the removal of lead ions. Batch experiments were performed to investigate the effect of physico-chemical parameters, such as pH, contact time, initial metal concentration and temperature. Equilibrium data were analyzed using Langmuir and Freundlich isotherm models. The thermodynamic parameters such as the change of enthalpy (ΔH 0 ), entropy (ΔS 0 ) and Gibb's free energy (ΔG 0 ) of adsorption systems were also determined and evaluated.

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“…The kinetics of direct phenol adsorption of AC followed the pseudosecond order model; and the equilibrium data fitted well with the Langmuir isotherm (Adinata et al, 2007). The adsorption isotherms and desorption of 2,4,6-trichlorophenol (TCP) as adsorbate on EFB AC showed that it was a promising low cost adsorbent (Tan et al, 2009). Md Arshad et al (2016 produced the AC from EFB which were activated using physical and chemical processes.…”

Section: Introductionmentioning

confidence: 90%

Activated Carbon From Oil Palm Biomass as Potential Adsorbent for Palm Oil Mill Effluent Treatment

Wafti¹

2017

JOPR

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Preparation of activated carbon from empty fruit bunch for hydrogen storage

Cited by 71 publications

References 18 publications

Application of the modified Dubinin-Astakhov equation for a better understanding of high-pressure hydrogen adsorption on activated carbons

Application of the modified Dubinin-Astakhov equation for a better understanding of high-pressure hydrogen adsorption on activated carbons

Zero-Cost Agricultural Wastes as Sources for Activated Carbons Synthesis: Lead Ions Removal from Wastewaters

Activated Carbon From Oil Palm Biomass as Potential Adsorbent for Palm Oil Mill Effluent Treatment

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