Open Access

Table 1

Atomic Si/Al ratios of the zeolite after the different steps of the synthesis process.

Zeolite Si/Al
Chemical analysis XRDa XPS
Parent NaY 2.5 2.6 2.4
Dealuminated SiCl4 18.4 29 14.5
Washed HCl 37.7 33 46.5
Desilicated NaAlO2 27.7 25 6.2

Estimated using the Fichtner-Schmittler equation [35].

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