Investigation of Na, TPA-ZSM-5 zeolite synthesis by chemical methods

Cundy, Colin S.; Henty, M.S.; Plaisted, R.J.

doi:10.1016/0144-2449(94)00042-q

Cited by 72 publications

(44 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At this stage, three types of siliceous component are present in the synthesis mixture: primary particles (smaller than 2.5 nm), amorphous colloidal aggregates (up to 9 nm) and crystals (larger than 50nm). Cundy, Henty & Plaisted (1995) quantitatively determined each type of siliceous component with ex situ chemical methods. Our in situ combined SAXS/WAXS results agree with their results.…”

Section: Discussionmentioning

confidence: 99%

Influence of Aging and Dilution on the Crystallization of Silicalite-1

Moor¹,

Beelen²,

Santen³

1997

J Appl Cryst

View full text Add to dashboard Cite

The correlation between the formation of colloidal aggregates and the crystallization of silicalite-1 from a clear solution has been investigated with in situ combined small-angle X-ray scattering and wide-angle X-ray scattering, and in situ ultra-small-angle X-ray scattering using synchrotron radiation. Increasing the aging time at room temperature of the synthesis mixture prior to heating to the reaction temperature reduced the induction period and increased the crystal growth rate without affecting the formation of colloidal aggregates. Dilution of the synthesis mixtures did not influence the nucleation and crystal growth rate, and did not affect the formation of colloidal aggregates.

show abstract

Section: Discussionmentioning

confidence: 99%

Influence of Aging and Dilution on the Crystallization of Silicalite-1

Moor¹,

Beelen²,

Santen³

1997

J Appl Cryst

View full text Add to dashboard Cite

show abstract

“…[3] Various mechanisms have been discussed regarding the process of establishing the long-range crystal structure. [4][5][6][7][8][9] Several assembly mechanisms regarding the nucleation and crystal growth have been proposed, including the formation and consumption of small primary units, medium nuclei, and large crystals. [10] Despite these efforts, due to the complexity of the zeolite formation process, a thorough understanding of the zeolite formation mechanism remains a challenge.…”

mentioning

confidence: 99%

In Situ UV Raman Spectroscopic Studies on the Synthesis Mechanism of Zeolite X

Fan

Feng

et al. 2008

Chemistry A European J

102

View full text Add to dashboard Cite

“…EMphotographs show that the shape of the crystals do not show the typical MFI shape with 90°twinning, [41][42][43] but the faces are rounded as often seen under conditions favoring fast growth of crystals and in stages that the growth of the crystals is not yet complete. However, we applied the form factor of perfectly spherical particles (eq 3).…”

Section: Saxs/waxsmentioning

confidence: 99%

In Situ Investigation of Si-TPA-MFI Crystallization Using (Ultra-) Small- and Wide-Angle X-ray Scattering

et al. 1997

View full text Add to dashboard Cite

The formation of precursors and the growth and aggregation of silicalite-1 crystals using tetrapropylammonium as a template (Si-TPA-MFI) has been studied in situ using X-ray scattering techniques. Simultaneous smallangle and wide-angle X-ray scattering (respectively SAXS and WAXS) experiments using synchrotron light showed that the formation of amorphous colloidal aggregates in water clear synthesis mixtures was dependent on the alkalinity of the solutions. In situ time-resolved ultra-small-angle X-ray scattering (USAXS) showed the form factor oscillations of the growing crystals. Fitting of the USAXS patterns to the scattering pattern of spherical particles having a normal particle size distribution showed a linear growth of the average crystal diameter, which was approximately the same for both alkalinities studied. The final size of the crystals was highest for the synthesis mixture having the highest alkalinity, which can be explained in terms of number of viable nuclei formed. At the end of the linear growth the crystals form aggregates corresponding with a diffusion limited aggregation process (mass fractal dimension of 1.8).

show abstract

Investigation of Na, TPA-ZSM-5 zeolite synthesis by chemical methods

Cited by 72 publications

References 26 publications

Influence of Aging and Dilution on the Crystallization of Silicalite-1

Influence of Aging and Dilution on the Crystallization of Silicalite-1

In Situ UV Raman Spectroscopic Studies on the Synthesis Mechanism of Zeolite X

In Situ Investigation of Si-TPA-MFI Crystallization Using (Ultra-) Small- and Wide-Angle X-ray Scattering

Contact Info

Product

Resources

About