Formation of MFI-Type Zeolite Nanoparticles and Zeolite-Based Suspensionsстатья
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Дата последнего поиска статьи во внешних источниках: 11 мая 2017 г.
Аннотация:DOI: 10.1134/S0965544116090115
Based on a commercial zeolite of the MFI type, nanoparticles have been produced using mechanical
methods (grinding in a ball or planetary mill, classification by “stirring-up”) and ultrasonic treatment of
zeolite in water. It has been found by spectral methods (XRD, DRIRS, 27Al and 29Si solid0state NMR) and
adsorption analysis that the grinding of the zeolite leads to partial degradation of its structure and appearance
of defects in the crystalline framework, whereas the zeolite crystal lattice remains completely intact after sonication
in the aqueous medium . The sonication destroys MFI agglomerates to form nanoparticles down to
40–50 nm in size. The dispersion of the zeolite nanoparticles in silicone or hydrocarbon oil–(Syltherm 800
or Dowtherm RP, respectively) as a high-boiling-point liquid leads to the formation of ultrafine suspensions,
the stability of which depends on the type of the dispersion medium. The nanosized zeolite suspensions are
more stable in Dowtherm RP than in Syltherm 800: without agitation, they are persistent for at least 3 weeks
(settling at room temperature).