Defects tune the acidic strength of amorphous aluminosilicates.

The peak area exhibited an increasing trend as the concentration of defects increased from D-AAS-12 to D-AAS-25 (Supplementary Fig. 10a, d, g ).

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The surface area showed a decreasing trend from 525 ± 25 m 2 g −1 in AAS to 485 ± 18 m 2 g −1 in D-AAS-12 and further to 473 ± 24 m 2 g −1 in D-AAS-25 (Fig. 1g–i ).

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