Microwave-green synthesis of AlPO-n and SAPO-n (n = 5 and 18) nanosized crystals and their assembly in layers

Add time:08/08/2019    Source:sciencedirect.com

Green synthesis of nanosized AlPO-n and SAPO-n (n = 5 and 18) crystals with AFI- and AEI-type structures from non-reacted precursor suspensions with an essential chemical compensation is presented. The crystallization of both materials was accomplished within few minutes (5–18 min) instead of several days by replacing the conventional with microwave heating. The nanosized AlPO-n and SAPO-n (n = 5 and 18) crystals were stabilized in coating suspensions and deposited in layers on silicon wafers. It was shown that the AFI-type crystals (one-dimensional pores with a diameter of 0.73 nm) were primarily oriented with (001) direction perpendicular to the substrate, while the AEI-type crystals (three-dimensional pores with a diameter of 0.38 nm) were randomly oriented. The relationship between the crystal orientation and the adsorption behavior of the AFI and AEI layers toward water was studied by GI-XRD and operando IR spectroscopy.

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