1994
DOI: 10.1016/0144-2449(94)90054-x
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Textural damage of cation-exchanged LTA zeolites studied by gas adsorption

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Cited by 10 publications
(6 citation statements)
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“…Remy and Poncelet (1995) suggested that the DR equation overestimated W 0,DR , with respect to W 0,t , when a solid presents an important external surface. Our value of S ext for NaX, 2.3 m 2 g −1 , is close to that found by Ginoux (1983), namely 2 m 2 g −1 and by Amari et al (1994) for NaA, i.e. 3.7 m 2 g −1 .…”
Section: Nitrogen Adsorptionsupporting
confidence: 78%
See 1 more Smart Citation
“…Remy and Poncelet (1995) suggested that the DR equation overestimated W 0,DR , with respect to W 0,t , when a solid presents an important external surface. Our value of S ext for NaX, 2.3 m 2 g −1 , is close to that found by Ginoux (1983), namely 2 m 2 g −1 and by Amari et al (1994) for NaA, i.e. 3.7 m 2 g −1 .…”
Section: Nitrogen Adsorptionsupporting
confidence: 78%
“…RI is somewhat higher for Cr(45)X, namely 1.67. Amari et al (1994) reported that RI changes either when the external surface or the microporous volume varies. Bearing in mind that cations act as adsorption centres, their distribution among non-framework sites determines their adsorptive behaviour.…”
Section: Nitrogen Adsorptionmentioning
confidence: 98%
“…Similarly, after cation exchange, the fact that only the first introduction of CO2 result in a relatively high heat of adsorption (80-90 kJ. Mol -1 ) does not assume that there is another type of site where takes place chemisorptions.This is not comparable with those obtained for the 4A zeolite which is about 120 kJ.mol -1 , and which calorimetry and IR spectroscopy studies indicate the chemisorptions onto zeolite 4A (Ginoux and Bonnetain, 1991;Amari et al, 1994;Delaval et al,1986;Takaishi et al, 1975) leading to two possible forms: carboxylate or carbonate; it explains the high heats observed for less than 0.3molec.cav -1 . The principal CO2 adsorption sites in the ZK-4 zeolite are of type Na (I), responsible of a strong heat of physical absorption and absence of the CO2 chemisorptions in ZK-4 could be explained starting from the assumption that CO2 is chemically absorbed on a cationic pair, in fact the missing Na (II) -Na (III) pair in ZK-4 (Ginoux, 1983).…”
Section: +contrasting
confidence: 56%
“…Broadening of the XRD diffraction bands of LTA was observed with increasing Ni loadings (see Figure S1 in the Supporting Information), indicating a certain loss of crystallinity due to the ion exchange. 35,36 While a hysteresis for the N 2 sorption was not observed for Ca-LTA (Figure S2), the sorption volume of the Ni-containing catalysts showed important differences during adsorption and desorption, pointing to an increase in the mesopore volume and a decrease in the micropore volume (Table S1). To minimize the effect of local lattice destruction, the loading of Ni was limited to 6 wt % on Ni-Ca-LTA.…”
Section: ■ Results and Discussionmentioning
confidence: 99%