Effect of the binary and ternary exchanges on crystallinity and textural properties of X zeolites

Hammoudi, H.; Bendenia, Souhila; Marouf-Khelifa, Kheira; Marouf, Réda; Schott, Jacques; Khelifa, Amine

doi:10.1016/j.micromeso.2007.11.032

Cited by 25 publications

(26 citation statements)

References 32 publications

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“…For the parent NaX zeolite, the BET surface area and the microporous volume are, respectively, equal to 590 m 2 g À1 and 0.317 cm 3 g À1 . These values are fully consistent with those reported by Hammoudi et al (2008) . The microporous volume of a unit cell of NaX is then equal to 4252 cm 3 unit cell À1 and that of BaX is equal to .…”

Section: Nitrogen Adsorptionsupporting

confidence: 93%

The preferential adsorption sites of H₂O on adsorption sites of CO₂ at low temperature onto NaX and BaX zeolites

Mfoumou

Mignard

Belin

2018

Adsorption Science & Technology

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Study of preferential adsorption sites of H 2 O on NaX and BaX zeolites was carried out after adsorption/desorption of carbon dioxide (CO 2 ). The profiles of CO 2 desorption revealed two distinct zones. The first one, at low temperature (T < 533 K), corresponding to physisorbed CO 2 where BaX zeolite has an energy of adsorption higher than that of NaX as well as strong interactions of adsorbent/adsorbate. The second one (533-623 K) corresponds to the chemisorbed CO 2 . The presence of water influences CO 2 adsorption. The effect is more important for NaX than for BaX. For NaX, water occupies the adsorption sites of CO 2 between 373 and 483 K. In contrast, BaX preserves a majority of adsorption sites of physisorbed CO 2 in the presence of water, in particular the adsorption sites located in the interval of temperature 423-533 K.

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Section: Nitrogen Adsorptionsupporting

confidence: 93%

The preferential adsorption sites of H₂O on adsorption sites of CO₂ at low temperature onto NaX and BaX zeolites

Mfoumou

Mignard

Belin

2018

Adsorption Science & Technology

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“…This is also due to the decrease in the number of extraframework cations, while n monovalent sodium ions are replaced with one M n+ . The same phenomenon was observed, in the case of the N 2 adsorption on Cu(x)X, Zn(x)X and CuZn(x)X (Hammoudi et al 2008), C 3 H 6 on Cu(x)X (Khelifa et al 1999b) and CO 2 on Cu(x)X and Zn(x)X (Khelifa et al 2001a).…”

Section: Nitrogen Adsorptionsupporting

confidence: 77%

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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“…The textural properties of the samples are listed in Table 2. The NaX sample presents a specific surface area of 451 m 2 /g, which is in the order of the values reported in the literature for this type of zeolite [22,25,26]. However, Cu addition leads to a decrease in the specific surface area of the copper-exchanged samples, the effect being more important for the CuX-B3 sample, which is the sample with the highest degree of exchange (see Table 1).…”

Section: Specific Surface Areasupporting

confidence: 58%

“…%, respectively. Hammoudi et al [26] reported a decrease in the N2 uptake with an increasing number of Cu 2+ ions in copper-exchanged X zeolites;…”

Section: Specific Surface Areamentioning

confidence: 99%

“…The catalytic activity of materials for toluene oxidation is typically compared using light off curves, curve of conversion versus reaction temperature, where the reactant mixture passes through a catalyst bed while the temperature is increased [26]. The subsequent S-shaped curves give an idea of the performance of different catalysts as well as total conversion minimal temperature.…”

Section: Toluene Catalytic Oxidation Testmentioning

confidence: 99%

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Removal of Toluene over NaX Zeolite Exchanged with Cu2+

et al. 2015

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Toluene is a major air pollutant emitted from painting and metal coating processes and might have some health effects. Adsorption and catalytic complete oxidation are promising ways to retain or convert toluene into harmless products. The present work aims to develop a bifunctional material which can be used as an adsorbent and catalyst for low-temperature toluene removal. Copper zeolites were obtained by exchanging the sodium in the parent NaX zeolite with copper from aqueous solutions of Cu(NO3)2•2.5H2O. Several characterization techniques, H2-TPR, XPS, XRD and N2 physisorption, were used in order to evaluate the redox, surface, structural and textural properties of the materials, respectively. The various materials were tested in adsorption and catalytic processes. The sample with low copper content (1 wt. %) exhibited promising features in terms of toluene adsorption capacity and total oxidation. The results can be correlated to the presence of micropores and well-dispersed CuO species. OPEN ACCESSCatalysts 2015, 5 1480

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Effect of the binary and ternary exchanges on crystallinity and textural properties of X zeolites

Cited by 25 publications

References 32 publications

The preferential adsorption sites of H₂O on adsorption sites of CO₂ at low temperature onto NaX and BaX zeolites

The preferential adsorption sites of H₂O on adsorption sites of CO₂ at low temperature onto NaX and BaX zeolites

Adsorptive properties of X zeolites modified by transition metal cation exchange

Removal of Toluene over NaX Zeolite Exchanged with Cu2+

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Effect of the binary and ternary exchanges on crystallinity and textural properties of X zeolites

Cited by 25 publications

References 32 publications

The preferential adsorption sites of H2O on adsorption sites of CO2 at low temperature onto NaX and BaX zeolites

The preferential adsorption sites of H2O on adsorption sites of CO2 at low temperature onto NaX and BaX zeolites

Adsorptive properties of X zeolites modified by transition metal cation exchange

Removal of Toluene over NaX Zeolite Exchanged with Cu2+

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The preferential adsorption sites of H₂O on adsorption sites of CO₂ at low temperature onto NaX and BaX zeolites

The preferential adsorption sites of H₂O on adsorption sites of CO₂ at low temperature onto NaX and BaX zeolites