Location of Framework Al Atoms in the Channels of ZSM-5: Effect of the (Hydrothermal) Synthesis

Chemistry : a European Journal
Veronika PashkovaJiří Dědeček

Abstract

(27) Al 3Q MAS NMR and UV/Vis spectroscopy with bare Co(II) ions as probes of Al pairs in the zeolite framework were employed to analyze the location of framework Al atoms in the channel system of zeolite ZSM-5. Furthermore, the effect of Na(+) ions together with tetrapropylammonium cation (TPA(+)) in the ZSM-5 synthesis gel on the location of Al in the channel system was investigated. Zeolites prepared using exclusively TPA(+) as a structure-directing agent (i.e., in the absence of Na(+) ions) led to 55-90% of Al atoms located at the channel intersection, regardless the presence or absence of Al pairs [Al-O-(Si-O)2 -Al sequences in one ring] in the zeolite framework. The presence of Na(+) ions in the synthesis gel did not modify the Al location at the channel intersection (55-95% of Al atoms) and led only to changes in i) the distribution of framework Al atoms between Al pairs (decrease) and single isolated Al atoms (increase), and ii) the siting of Al in distinguishable framework tetrahedral sites.

References

Jun 24, 2008·Nature Materials·Jeroen A van BokhovenJörg Zegenhagen
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Citations

Mar 9, 2017·Chemistry : a European Journal·Robert KarczStepan Sklenak
Apr 6, 2017·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Siwar ChibaniMichael Badawi
Jun 23, 2018·Physical Chemistry Chemical Physics : PCCP·Jorge Arce-MolinaA Rabdel Ruiz-Salvador
Jun 26, 2021·Chemical Science·Raquel SimancasTatsuya Okubo

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