Low-temperature synthesis and characterization of a stable colloidal TPA-silicalite-1 suspension
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Cited by (52)
Octane enhancement by the selective separation of branched and linear paraffins in naphthas using a PVDC-PVC carbon molecular sieve
2014, FuelCitation Excerpt :A more detailed description of the synthesis and properties of the CMS-IMP12 can be seen elsewhere [11,12]. X-ray of the silicalite-1 (Fig. 3) coincides with published data [24]. Comparisons of adsorption selectivity of the lumped data according to the classification described in the experimental part, were obtained by means of breakthrough curves of the real feed at different temperatures (175, 250 and 325 °C) with both CMS-IMP12 and silicalite-1.
Variation of particle size and its distribution during the synthesis of silicalite-1 nanocrystals
2012, Microporous and Mesoporous MaterialsCitation Excerpt :Although earlier appearance in the solid products, of small amounts of particles/regions with pore sizes in a range including the pore sizes of silicalite-1, was indicated by both the DFT and Saito–Foley analyses, variation of the Saito–Foley median diameter with synthesis time provided a clear evidence of the significance of the observed “induction time”, after which particles could grow at a constant linear rate. As reported in some other previous studies [34,35], external surface area values higher than those predicted by calculation from the particle sizes, were measured for the synthesis composition used in our adsorption study [33] too. In our case, this was observed for both of the two particle populations formed by the two distinct aggregative processes taking place during crystallization, one accompanying nucleation, and the second one at the very beginning of the synthesis.
Simple synthesis recipes of porous materials
2011, Microporous and Mesoporous MaterialsCitation Excerpt :To obtain zeolite crystals (ca. 100 nm in this system) within a reasonable timeframe, the solution needs to be treated hydrothermally at typically 100 °C for several hours. At room temperature, Silicalite-1 crystals only form after a long time (months to years) [11–13]. These observations show the crystallization of zeolites is a strongly activated process.
Controllable and SDA-free synthesis of sub-micrometer sized zeolite ZSM-5. Part 1: Influence of alkalinity on the structural, particulate and chemical properties of the products
2011, Microporous and Mesoporous MaterialsCitation Excerpt :An increase of alkalinity (A = [Na2O/H2O]b = 0.002 and [Na+/SiO2]b = 0.16) evidently increases the solubility of both amorphous silica and aluminum hydroxide and thus, production of silicate and/or aluminate species in the concentration sufficient for the formation of amorphous (alumino)silicate (see the XRD pattern B in Fig. 4 and the SEM image B in Fig. 5) having the particles with broad size distribution (1–200 nm; see dashed curve in Fig. 6B). Heating of the reaction mixture may cause several processes; (i) dissolution of the amorphous silica and/or aluminum hydroxide [53,54] which are not dissolved at ambient temperature and thus, further increase of the concentrations of silicate and aluminate species in the liquid phase, (ii) formation of additional amount of gel by polycondensation reaction of newly formed silicate and/or aluminate species, (iii) formation of 5-1 secondary building units, and their condensation into active growth precursor species [37,41] in the gel matrix [48,55–57], (iv) deposition of the growth precursor particles from the amorphous shell onto the surfaces of silicalite-1 seed crystals [26,48] and (v) “ordering” of the deposited growth precursor particles by their gradual transformation [26,48,58] from amorphous and/or partially crystalline phase [42] to fully crystalline phase (zeolite ZSM-5) [26]. However, also in this case (A = 0.002), the mentioned processes (i–iv) are obviously too slow for complete transformation of the amorphous to crystalline phase in 2 h. Assuming that all amorphous silica is dissolved and transformed into gel by polymerization reactions during hydrothermal treatment, the incomplete crystallization is the consequence of slow occurrences during some or even all following steps; (iii), (iv) and/or (v).
Nanoparticle silicalite-1 crystallization as monitored by nitrogen adsorption
2010, Microporous and Mesoporous MaterialsSynthesis of hierarchical porous zeolite NaY particles with controllable particle sizes
2010, Microporous and Mesoporous Materials