Crystallization of low-solica faujasite ()

Kühl, Günter H.

doi:10.1016/0144-2449(87)90014-5

Cited by 105 publications

(44 citation statements)

References 3 publications

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“…Commercial NaY and NaX zeolites were obtained from Grace Davison and Aldrich respectively. Low silica X zeolite (LSX) was synthesised in the laboratory according to Kühl (Kühl 1987) and exchanged three times with sodium chloride solutions to obtain the NaLSX sample, following the procedure described elsewhere (Sotelo et al 2001). In the same way, potassium and caesium exchanged zeolites were prepared from the NaLSX zeolite by using the conditions summarised in Table 1.…”

Section: Adsorbent Preparationmentioning

confidence: 99%

Fixed bed adsorption of benzothiophene over zeolites with faujasite structure

2007

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This work addresses the adsorption of benzothiophene (BT), as a model heterocyclic and aromatic sulphur compound present in road fuels, over agglomerated zeolites with faujasite structure. Several adsorbents based on zeolites with FAU structure have been prepared with different Si/Al molar ratios and exchange cations and then agglomerated. The influence of the zeolite basicity has been studied, both in equilibrium and dynamic liquid phase adsorption experiments. Basicity of the adsorbent increased as the Si/Al molar ratio and the electronegativity of the exchange cation decreased. In equilibrium experiments, the affinity towards the adsorbent increased as the Si/Al molar ratio decreased, showing the highest affinity for exchanged low silica X zeolites with medium basicity (A-KLSX-02). Dynamic experiments showed that the less zeolite basicity, the higher fractional bed utilization and adsorption capacity at breakthrough time. Besides, zeolites with high basicity did not reach the equilibrium capacity due to the low diffusivity of BT into the micropores. Thermogravimetric analyses of the spent adsorbents showed a stronger BT adsorption onto the more basic zeolites. As main conclusion, adsorbents with medium basicity could present the best performance in fuel desulphurization due to their high affinity with sulphur compounds, although diffusion problems should be taken into account.

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Section: Adsorbent Preparationmentioning

confidence: 99%

Fixed bed adsorption of benzothiophene over zeolites with faujasite structure

2007

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“…22 The loading of CsNaX with Cs 2 O was carried out by saturation of the zeolite with caesium-acetate followed by calcination in oxygen at 450-500°C. 23 The preparation of hydrotalcite samples was described previously.…”

Section: Experimental Materialsmentioning

confidence: 99%

Terminal and bridging methoxyls on zeolites detected by13C magic angle spinning NMR spectroscopy

et al. 1999

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“…Kühl has found that pure LSX zeolite can only be obtained when the reaction mixture contains both sodium and potassium ions [33]. The K/(Na ?…”

Section: Introductionmentioning

confidence: 99%

An investigation into the crystallization of low-silica X zeolite

Zhang

Huang

2015

J Porous Mater

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The crystallization of low-silica X (LSX) zeolite with FAU topology was examined under hydrothermal synthesis conditions. PXRD was employed to follow the evolution of the long-range ordering of the gel. Raman spectra provided information on various ring and cage species existing in the gel. 27 Al and 29 Si solid-state NMR spectroscopy was utilized to monitor the change in local environment of tetrahedral sites. The results indicate that an amorphous aluminosilicate phase was formed immediately upon mixing different reactive species. Hydrothermal treatment led to the formation of sodalite-cage like species and the species with larger cavities, joint four-member rings (4Rs) and branched 4Rs, which are the structural building units of the FAU framework. These units were assembled into the crystalline structure of LSX zeolite. 23 Na and 39 K solid-state NMR results show that the transformation process was accompanied by the changes of the local structure of hydrated Na ? and K ? ions. The two types of cations may work synergistically to template the crystallization of LSX zeolite.

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Crystallization of low-solica faujasite ()

Cited by 105 publications

References 3 publications

Fixed bed adsorption of benzothiophene over zeolites with faujasite structure

Fixed bed adsorption of benzothiophene over zeolites with faujasite structure

Terminal and bridging methoxyls on zeolites detected by13C magic angle spinning NMR spectroscopy

An investigation into the crystallization of low-silica X zeolite

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