Non-ionic-microemulsion mediated growth of zeolite A

Carr, C. S.; Shantz, Daniel F.

doi:10.1016/j.micromeso.2005.06.029

Cited by 26 publications

(16 citation statements)

References 43 publications

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“…The cyclohexane may act to solvate the hydrophobic chain of the surfactant, the butanol to lower the interfacial tension, and the surfactant (and butanol) to interact with the aluminosilicate species in solution via van der Waal's forces. The emulsion inducing rapid growth was also reported by Shantz et al when they investigated the nonionic-microemulsion mediated growth of zeolite A (Carr and Shantz 2005). They believed that the nonionic surfactant interacted with the aluminosilicate precursors, which led to the increase of local concentration of these precursors and the final quick growth of zeolite crystal.…”

Section: Resultssupporting

confidence: 62%

“…Specifically, when decanol substitutes for butanol, the particle sizes increase from 400 nm to 600 nm (figures 3b and d). The similar impacts of surfactant identity on the zeolite morphology have been reported in the nonionic microemulsion synthesis of zeolite A (Carr and Shantz 2005). This indicates that in the emulsion-mediated synthesis of zeolite beta, the particle size can be tuned by the adoption of different lengths of alkyl chains in the surfactants and cosurfactants.…”

Section: Particle Size Controlsupporting

confidence: 71%

“…Recently, microemulsion has been used to synthesize zeolite A and Silicalite-1 and the ability of microemulsion to induce rapid crystallization and control crystal morphology has been elaborately demonstrated (Lee and Shantz 2004;Carr and Shantz 2005;Lee and Shantz 2005a, b). However, microemulsion has not yet been applied to synthesize other types of zeolites, especially those crystallized with the templating of SDAs such as beta and ZSM-5.…”

Section: Introductionmentioning

confidence: 99%

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Nonionic emulsion-mediated synthesis of zeolite beta

et al. 2011

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Zeolite beta synthesis was first carried out in a newly developed emulsion system containing nonionic polyoxyethylated alkylphenol surfactant, which showed interesting non-conventional features. Compared to the conventional hydrothermal synthesis of zeolite beta, the reported nonionic emulsion system showed a faster nucleation rate. Furthermore, the emulsion system could stabilize the beta product and retarded its further transformation to ZSM-5 even under the high crystallization temperature at 453 K. Additionally, the beta particle size could be tuned by the adoption of different lengths of alkyl chain in the surfactant and cosurfactant. Control experiments showed each emulsion component played a crucial role in the zeolite beta growth. The approach proposed in this paper might be extended to apply for the syntheses of other types of zeolites with particle size under control.

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Section: Resultssupporting

confidence: 62%

Section: Particle Size Controlsupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

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Nonionic emulsion-mediated synthesis of zeolite beta

et al. 2011

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“…Emulsions can be differentiated between macroemulsions (= emulsions) and microemulsions (Wu et al, 2017). Macroemulsions are built of dispersed droplets with radii in the range of 1-90 μm, whereas microemulsions are built of dispersed droplets with radii in the range of 5–50 nm (Carr and Shantz, 2005). Both can be further differentiated in direct and reverse emulsions (Figure 1, Figure S6).…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Nano/Microsized MIL-101Cr Through Combination of Microwave Heating and Emulsion Technology for Mixed-Matrix Membranes

et al. 2019

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Nano/microsized MIL-101Cr was synthesized by microwave heating of emulsions for the use as a composite with Matrimid mixed-matrix membranes (MMM) to enhance the performance of a mixed-gas-separation. As an example, we chose CO2/CH4 separation. Although the incorporation of MIL-101Cr in MMMs is well-known, the impact of nanosized MIL-101Cr in MMMs is new and shows an improvement compared to microsized MIL-101Cr under the same conditions and mixed-gas permeation. In order to reproducibly obtain nanoMIL-101Cr microwave heating was supplemented by carrying out the reaction of chromium nitrate and 1,4-benzenedicarboxylic acid in heptane-in-water emulsions with the anionic surfactant sodium oleate as emulsifier. The use of this emulsion with the phase inversion temperature (PIT) method offered controlled nucleation and growth of nanoMIL-101 particles to an average size of <100 nm within 70 min offering high apparent BET surface areas (2,900 m2 g−1) and yields of 45%. Concerning the CO2/CH4 separation, the best result was obtained with 24 wt.% of nanoMIL-101Cr@Matrimid, leading to 32 Barrer in CO2 permeability compared to six Barrer for the neat Matrimid polymer membrane and 21 Barrer for the maximum possible 20 wt.% of microMIL-101Cr@Matrimid. The nanosized filler allowed reaching a higher loading where the permeability significantly increased above the predictions from Maxwell and free-fractional-volume modeling. These improvements for MMMs based on nanosized MIL-101Cr are promising for other gas separations.

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“…A small variation of these conditions can lead to the formation of mixed (LTA+FAU) or unwanted phases. LTA is usually synthesized in the presence of tetramethylammonium cation (TMA + ) [7,8] or without a structure-directing agent (SDA) [9][10][11][12][13][14], although other surfactants are also employed [15]. In the case of FAU, the use of TMA + [12,16,17] and crown ether [18] are reported, although the structure can also be obtained without structure-directing agent [14,19,20].…”

Section: Introductionmentioning

confidence: 99%

Selection between LTA or FAU phases by manipulating the synthesis gel composition, crystallization time and temperature

et al. 2019

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LTA and FAU zeolites were synthesized with the addition of cetyltrimethylammonium bromide (CTAB) to assess the effects of Si/Al, Na/Al and H2O/Al ratios, time and temperature on the yield of each structure. The significance of each variable was determined by means of experimental designs, whose response variables were the areas of specific XRD peaks. CTAB did not act as a structure-directing agent, but rather as a growth modifier, increasing the growth rate of LTA and FAU crystals. At low temperature, LTA was afforded at low Si/Al ratio, while FAU crystallized at higher ratios, indicating a competition between the phases. Increasing temperature accelerated the kinetics of recrystallization of the less dense and metastable LTA and FAU phases in denser and more stable phases, such as sodalite and cancrinite. Decreasing the concentration of Na+ and water reduced the crystallinity of both structures, while increasing the concentration of Na+ favored LTA over FAU.

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Non-ionic-microemulsion mediated growth of zeolite A

Cited by 26 publications

References 43 publications

Nonionic emulsion-mediated synthesis of zeolite beta

Nonionic emulsion-mediated synthesis of zeolite beta

Synthesis of Nano/Microsized MIL-101Cr Through Combination of Microwave Heating and Emulsion Technology for Mixed-Matrix Membranes

Selection between LTA or FAU phases by manipulating the synthesis gel composition, crystallization time and temperature

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