Evolution des propriétés structurales et texturales des zéolithes x dans le cas de léchange binaire et ternaire

Khelifa, Amine; Benchdida, Leila; Benmaamar, Zoubir

doi:10.3166/acsm.31.11-22

Cited by 5 publications

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“…Consequently, the substitution of Na + by Ni 2+ and/or Cr 3+ does not damage the framework of X zeolites, except for CrNi(39)X for which there is a slight decrease in the intensity of reflections. 33 The latter would be partly explained by the diminution of the number of atoms per lattice plane. For each Ni 2+ and Cr 3+ exchanged, there is the exit of two and three Na + , respectively.…”

Section: Methodssupporting

confidence: 93%

“…Both strong and medium intensity peaks persist after ion-exchange. Consequently, the substitution of Na + by Ni 2+ and/or Cr 3+ does not damage the framework of X zeolites, except for CrNi(39)X for which there is a slight decrease in the intensity of reflections . The latter would be partly explained by the diminution of the number of atoms per lattice plane.…”

Section: Resultsmentioning

confidence: 95%

“…The strong intensity peaks for the reference zeolite (Figure 2d) at the 2θ angle of 6.04°, 23.27°, 26.67°, and 30.92°, could be assigned to the (111), (533), (642), and (660) reflections of NaX, respectively. 33 The medium intensity peaks at the 2θ angle of 9.92°, 15.37°, 20.03°, and 32.05°, could be attributed to the (220), (331), (440), and (550) reflections, respectively. Both strong and medium intensity peaks persist after ion-exchange.…”

Section: Methodsmentioning

confidence: 99%

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Adsorption of Propylene and Propane onto Mⁿ⁺X (Mⁿ⁺ = Cr³⁺ and/or Ni²⁺) Zeolites and Comparison between Binary and Ternary Exchanges

et al. 2016

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M n+X zeolites (M n+ = Ni2+ and/or Cr3+) were prepared and characterized by various techniques. The adsorption of propylene and propane onto these zeolites was investigated, and thermodynamic properties were discussed. The objective is to establish a comparison between the binary (introduction of Ni2+ or Cr3+ instead of Na+) and ternary (introduction of Ni2+ and Cr3+ instead of Na+) exchanges. To our knowledge, there is no work in this field, in spite of a growing interest in bimetallic zeolites. Isotherms of C3H6 and C3H8 were successfully modeled using the Toth equation. A change in K H, Henry’s law slope, confirms the strong and weak characters of the interactions with propylene and propane, respectively. CrNi(39)X has an intermediary behavior between Cr(39)X and Ni(40)X. It manifests specific interaction with C3H6 molecules through the deep implication of Cr3+ cations, at low coverage. With increasing adsorbate concentration, the contribution of Ni2+ occurs.

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Section: Methodssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 95%

Section: Methodsmentioning

confidence: 99%

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Adsorption of Propylene and Propane onto Mⁿ⁺X (Mⁿ⁺ = Cr³⁺ and/or Ni²⁺) Zeolites and Comparison between Binary and Ternary Exchanges

et al. 2016

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“…1. Except for the Cr(39)X sample, for which there was a relative decrease in the intensity of peaks, indicative of a slight loss of crystallinity during preparation, all the other ion-exchanged samples were well crystallized [21].…”

Section: Methodsmentioning

confidence: 95%

Adsorption of carbon dioxide by X zeolites exchanged with Ni2+ and Cr3+: isotherms and isosteric heat

Khelifa

Benchehida

Derriche

2004

Journal of Colloid and Interface Science

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“…2 Evolution of micropore volume, W 0,t , versus percentage of ion-exchange sharp decrease of crystallinity percentage of Cr(45)X, i.e. 34% (Khelifa et al 2006).…”

Section: Nitrogen Adsorptionmentioning

confidence: 99%

Adsorptive properties of X zeolites modified by transition metal cation exchange

et al. 2011

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The ionic exchange of the NaX zeolite by Ni 2+ and Cr 3+ cations was progressively driven and studied by adsorption of nitrogen and carbon dioxide. For each cationexchanged X zeolite sample, the development of characteristics such as profile of isotherms, RI criterion, isosteric adsorption heat and microporous volume using both the Dubinin-Radushkevich (DR) equation and the t-plot, was followed through the nitrogen adsorption. Results show that the cationic exchange process, in the case of Cr 3+ introduced at middle degree, is accompanied by a textural damage for Cr(x)X, in contrast to Ni 2+ -exchanged X zeolites. This degradation occurs without significant presence of mesopores, because the RI criterion values were found to be much lower than 2.2. The CO 2 adsorption isotherms were measured at intervals of 30 K from 273 K and the equilibrium pressures ranged from 0.5 to 600 Torr. The experimental data were correlated by the Toth model. The associated three adjustable parameters were estimated by nonlinear least-squares analysis. The effect of temperature on

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Evolution des propriétés structurales et texturales des zéolithes x dans le cas de léchange binaire et ternaire

Cited by 5 publications

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Adsorption of Propylene and Propane onto Mⁿ⁺X (Mⁿ⁺ = Cr³⁺ and/or Ni²⁺) Zeolites and Comparison between Binary and Ternary Exchanges

Adsorption of Propylene and Propane onto Mⁿ⁺X (Mⁿ⁺ = Cr³⁺ and/or Ni²⁺) Zeolites and Comparison between Binary and Ternary Exchanges

Adsorption of carbon dioxide by X zeolites exchanged with Ni2+ and Cr3+: isotherms and isosteric heat

Adsorptive properties of X zeolites modified by transition metal cation exchange

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Evolution des propriétés structurales et texturales des zéolithes x dans le cas de léchange binaire et ternaire

Cited by 5 publications

References 0 publications

Adsorption of Propylene and Propane onto Mn+X (Mn+ = Cr3+ and/or Ni2+) Zeolites and Comparison between Binary and Ternary Exchanges

Adsorption of Propylene and Propane onto Mn+X (Mn+ = Cr3+ and/or Ni2+) Zeolites and Comparison between Binary and Ternary Exchanges

Adsorption of carbon dioxide by X zeolites exchanged with Ni2+ and Cr3+: isotherms and isosteric heat

Adsorptive properties of X zeolites modified by transition metal cation exchange

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Resources

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Evolution des propriétés structurales et texturales des zéolithes x dans le cas de léchange binaire et ternaire

Adsorption of Propylene and Propane onto Mⁿ⁺X (Mⁿ⁺ = Cr³⁺ and/or Ni²⁺) Zeolites and Comparison between Binary and Ternary Exchanges

Adsorption of Propylene and Propane onto Mⁿ⁺X (Mⁿ⁺ = Cr³⁺ and/or Ni²⁺) Zeolites and Comparison between Binary and Ternary Exchanges