Fig. 2: FTIR spectra of silanol region (3000–3800 cm−1) of nanosized AP-CHA, K-CHA, and Cs-CHA zeolite samples at 298 K. | Communications Chemistry

Fig. 2: FTIR spectra of silanol region (3000–3800 cm−1) of nanosized AP-CHA, K-CHA, and Cs-CHA zeolite samples at 298 K.

From: Interplay between alkali-metal cations and silanol sites in nanosized CHA zeolite and implications for CO2 adsorption

Fig. 2

a Samples pretreated at 623 K under high vacuum (10−6 kPa) prior to measurement and b at 27.2 kPa CO2 equilibrium. Color code: purple for silanol sites interacting with cations, blue for isolated and weakly hydrogen-bonded, yellow for moderately hydrogen-bonded, and red for strongly hydrogen-bonded silanol sites. Peak assignment: isolated silanol sites ∼3740 cm−1, υ3 + υ1 of CO2 at 3700 cm−1, and υ3 + 2υ2 of CO2 at 3595 cm−1.

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