Investigation of hydrogen adsorption on zeolites A, X and Y using statistical physics formalism

Bouaziz, Nadia; Manaa, Marwa Ben; Aouaini, Fatma; Lamine, Abdelmottaleb Ben

doi:10.1016/j.matchemphys.2018.12.024

Cited by 34 publications

(32 citation statements)

References 30 publications

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“…If n is less than 1, only a fraction of solute molecules are adsorbed; it consists in multi-anchorage adsorption. In the second case, if n is greater than 1, it is an interstitial site filled with more than one molecule; this case corresponds to multi-molecular adsorption [46].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Statistical physics modelling of azo dyes biosorption onto modified powder of Acorus calamus in batch reactor

Djama

Chebli

Bouguettoucha

et al. 2021

Biomass Conv. Bioref.

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Section: Accepted Manuscriptmentioning

confidence: 99%

Statistical physics modelling of azo dyes biosorption onto modified powder of Acorus calamus in batch reactor

Djama

Chebli

Bouguettoucha

et al. 2021

Biomass Conv. Bioref.

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“…where h, V, and m are the Planck constant, the volume of the hydrogen gas and the sorbed molecule mass, respectively. The translation partition function per unit of volume z gtr , for an ideal gas, can be represented as a function of the hydrogen saturated vapor pressure P vs and the hydrogen vaporization energy ΔE v by the equation [14][15][16][17][18][19] :…”

Section: Description Of the Hydrogen Adsorption Behavior And Developmmentioning

confidence: 99%

“…By utilizing the ideal gas approximation, the chemical potential in the gaseous state can be given by the following equation 15 : where is the translation partition function of the hydrogen gaseous molecules which can be written as 15 , 16 : where h, V , and m are the Planck constant, the volume of the hydrogen gas and the sorbed molecule mass, respectively. The translation partition function per unit of volume z gtr , for an ideal gas, can be represented as a function of the hydrogen saturated vapor pressure P vs and the hydrogen vaporization energy ΔE v by the equation 14 – 19 : where Using Eq. ( 4 ) and the number of average site occupation N o , the average number of sorbed molecules is written as: The adsorbed quantity is written as: The theoretical equation of this multilayer model presents numerous physicochemical parameters that can be determined from the experimental data of hydrogen adsorption on the two ACs by modeling examination: the number of hydrogen molecules per binding site n ms , the density of binding sites D sr , the number of sorbed layers N and the pressures at half saturation P hs1 and P hs2 for the first and the Nth layers respectively.…”

Section: Description Of the Hydrogen Adsorption Behavior And Developmmentioning

confidence: 99%

Study of the hydrogen physisorption on adsorbents based on activated carbon by means of statistical physics formalism: modeling analysis and thermodynamics investigation

Yahia

Wjihi

2020

Sci Rep

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An advanced statistical physics model has been applied to study the hydrogen adsorption isotherm on two modified types of activated carbon, namely granular coal activated carbon (AC (GC)) and coconut shell activated carbon (AC (CS)). This model is established with the statistical physics approach. It is a more general model including various parameters having a defined physico-chemical sense which were discussed at different temperatures. Hence new physic-chemical interpretations of the adsorption process of hydrogen are provided. The analysis of the hydrogen uptake capacities at saturation showed that the AC (GC) adsorbent displayed a high adsorption capacity (3.21 mg/g). This due to the contribution of the number of hydrogen molecules per site (1.27) associated with the receptor sites density (0.74 mg/g) and the number of formed layers (3.42). The modeling results suggested that the hydrogen adsorption occurred by non-parallel positions on the two tested adsorbents thus evincing that the adsorption cannot be other than a multi-molecular process. The calculated adsorption energies globally varied from 7.01 to 12.92 kJ/mol, confirming the physical nature of the adsorption process for both studied systems. The thermodynamic functions, namely internal energy, enthalpy and entropy were estimated to better analyze the hydrogen sorption process. In summary, the statistical physics analysis provided reliable concrete physico-chemical interpretations of hydrogen adsorption process on carbon-based adsorbents with various microstructures to develop a storage compounds with a suitable framework for a hydrogen storage structure.

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“…[6][7][8][9] Compared to conventional CO 2 separation methods, which include cryogenic distillation and membrane separation, solid adsorption (zeolitic materials) is a more promising method for its energy efficiency and operational and kinetic simplicity. [10][11][12][13][14][15] Zeolites are the type of aluminosilicates which consist tetrahedral structures of SiO 4 and AlO 4 . [16][17][18] They have three-dimensional structures with well-defined micropores or mesopores.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis of zeolite Y from green materials

et al. 2021

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Several probes have been conducted by the scientific community to reduce emissions of greenhouse gases such as carbon dioxide (CO 2 ). A zeolitic material is capable of CO 2 adsorption with the aid of such technologies. Our present work is to efficiently synthesize zeolite Y with four Si/Al ratios (2.0, 2.5, 3.0, and 3.5) from green materials such as rice husk ash (source of Si) and metakaolin (source of Al). The method for preparing zeolite Y involves hydrothermal synthesis in a hydrodynamic reactor at 120 C temperature, for a reaction time of 24 hours. These synthetic zeolites represent high values for surface area as well as pore volume in micropore range and are compatible with the size of CO 2 molecules. The zeolite Y (with Si/Al ratio 3.5) has an absorption capacity of 3.35 mmol CO 2 /g at (900 kPa) pressure, thereby

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Investigation of hydrogen adsorption on zeolites A, X and Y using statistical physics formalism

Cited by 34 publications

References 30 publications

Statistical physics modelling of azo dyes biosorption onto modified powder of Acorus calamus in batch reactor

Statistical physics modelling of azo dyes biosorption onto modified powder of Acorus calamus in batch reactor

Study of the hydrogen physisorption on adsorbents based on activated carbon by means of statistical physics formalism: modeling analysis and thermodynamics investigation

Hydrothermal synthesis of zeolite Y from green materials

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