Mechanism of zeolites crystal growth: new findings and open questions

International audienc

Template-Free Nanosized EMT Zeolite Grown on Natural Luffa Fibers for Water Purification

International audienc

Template-Free Nanosized EMT Zeolite Grown on Natural Luffa Fibers for Water Purification

International audienc

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

International audienceGreen 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 minutes) 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 is 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

Synthesis and Characterization of Conductive Zeolite/Polymers Composite

International audienc

Synthesis of AlPO-5 with diol-substituted imidazolium-based organic template

International audienceAlPO-5 crystals were prepared using 3-(2,3-dihydroxypropyl)-1,2-dimethylimidazolium hydroxide, [dhpdm]OH, as a new structure-directing agent. The effects of the synthesis conditions and precursor compositions on the crystallinity, crystallite size, morphology and phase purity have been studied. The results showed that well-defined AlPO-5 crystals with various morphologies and sizes were synthesized by careful adjustment of the synthesis conditions. Furthermore, the state of the occluded [dhpdm]OH molecules in the AlPO-5 crystals was also studied. The confined [dhpdm]OH molecules exhibited polar diol functionality, which provoked the very strong interaction with the AlPO-5 crystals. An alternative method for template removal based on the Fenton-like microwave assisted oxidation reaction was applied and it was found to be more efficient as compared to conventional calcination

Synthesis and Characterization of Conductive Zeolite/Polymers Composites

International audienc

Synthesis and Characterization of Conductive Zeolite/Polymers Composite

International audienc

Selective response of pyrylium-functionalized nanozeolites in the visible spectrum towards volatile organic compounds

International audienc