Aerosol-assisted hydrothermal synthesis of hierarchical Sn-Beta nanoaggregates in fluoride media

2021 
Abstract The hydrothermal synthesis of nanosized zeolite in fluoride media is a great challenge. In this study, Sn-Beta zeolites with tunable morphologies from typical truncated bipyramid to hierarchical nanoaggregates were successfully synthesized by a facile aerosol-assisted hydrothermal method. Firstly, organosilane trimethoxy [3-(phenyl) propyl] silane (PHAPTMS) was introduced into the Sn-Si oxide by a simple aerosol process, which can act as the synthesis precursor. Then the Sn-Si precursor was hydrothermally crystallized in the presence of fluoride and seeds. A comprehensive characterization of XRD, N2 physisorption, SEM, TEM, UV–vis and FTIR spectroscopy with pyridine and deuterated acetonitrile adsorption were used to confirm its physicochemical properties. It was found that the amount of the added PHAPTMS has a great influence on the morphologies, compositions, pore structure and acid properties of the resultant hierarchical Sn-Beta nanoaggregates. The investigation of the crystallization process demonstrated that the addition of PHAPTMS has a crucial role for the formation of hierarchical Sn-Beta nanoaggregates. The obtained Sn-Beta nanoaggregates exhibited enhanced catalytic performance in the Baeyer–Villiger oxidation of ketones to lactones due to the improved diffusion property. This strategy provides a new route for the hydrothermal synthesis of hierarchical nano zeolites in the fluoride media.
    • Correction
    • Source
    • Cite
    • Save
    • Machine Reading By IdeaReader
    55
    References
    1
    Citations
    NaN
    KQI
    []