Crystallization field and rate study for the synthesis of ferrierite

Gogebakan, Zuhal
Yücel, Hayrettin
Culfaz, Ali
A partial crystallization field and rate study was performed for the synthesis of ferrierite from gels of variable composition: 1.85Na(2)O center dot Al2O3 center dot xSiO(2)center dot 592H(2)O center dot 19.7R, where R = pyrrolidine or ethylenediamine. The variables of syntheses were the SiO2/Al2O3 molar ratio of the gel (10 < x < 25), temperature (150 degrees C < T < 225 degrees C), and crystallization time (t < 480 h). The crystallization rate was determined to be strongly dependent on temperature, whereas the SiO2/Al2O3 ratio and template type had no significant influence. Ferrierite was the only crystalline phase observed throughout the entire crystallization field studied when ethylenediamine was the templating agent. For some batches, mordenite appeared as a crystalline impurity when pyrrolidine was the template. Thermal stability tests indicated that ferrierites retained their crystallinities up to 1050 degrees C. The methanol sorption capacity of highly crystalline ferrierite samples approached the theoretical sorption volume, indicating that it can be used as a measure of purity for single-phase ferrierite samples.


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Ozturk, A (Springer Science and Business Media LLC, 1997-05-15)
Crystallization behaviour of glasses from the system AlF3-MF2-Ba(PO3)(2) (M = Ca, Mg, Sr, Ba) have been studied using differential thermal analysis as a function of Ba(PO3)(3). The kinetic parameters for crystallization, namely, the activation energy, E frequency factor, v, and Avrami exponent, n, were determined. E,v and n decreased with increasing Ba(PO3)(2). Crystallization commenced at higher temperatures and the crystal growth mechanism changed from bulk to surface with increasing Ba(PO3)(2). X-ray dif...
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Compositional dependence of lattice parameters and unit cell volumes of TlMeX2-type (Me = Ga or In and X = S or Se) layered mixed crystals with monoclinic structure has been studied by X-ray diffraction technique. It is revealed that the lattice parameters of TlGa1-xInxSe2, TlGa(S1-xSex)(2), TlGa1-xInxS2 and TlIn(Se1-xSx)(2) mixed crystals increase due to the substitution of gallium atoms by indium and sulfur atoms by selenium. Moreover, the absorption edges of these mixed crystals have been investigated th...
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Erkoç, Şakir (2001-05-04)
The structural and electronic properties of borazine cyclacenes (BNn) have been investigated by performing semiempirical molecular orbital self-consistent field calculations at the level of AM1 method within the RHF formulation. It has been found that as the number of borazine rings increases in the arenoid belt the structures become more exothermic.
Synthesis, crystal structure, spectroscopic investigations, thermal behavior and DFT calculations of pentacarbonyl(2-methylpyrazine)chromium(0)
MORKAN, İzzet; Celik, Derya; Morkan, Ayse Uztetik; GÜVEN, KUTALMIŞ (2012-07-01)
Pentacarbonyl(2-methylpyrazine)chromium(0) [Cr(CO)(5)(2mpyz)], complex was isolated from its n-hexane solution as orange plate-like crystals which were characterized by IR, NMR spectroscopies and X-ray crystallography. The crystallographic results show that the complex was crystallized in the monoclinic system with the unit cell parameters of a = 7.176 (5), b = 12.045 (3), c = 14.461 (3)angstrom, beta=90.44 (3)degrees and space group 2/M. The single crystal structure of the complex shows the bonding of chro...
Optical properties of TlGaxIn1-xS2 layered mixed crystals (0 <= x <= 1) I. Composition- and temperature-tuned energy band gap
Hasanlı, Nızamı (2010-05-28)
Optical properties of the TlGaxIn1-xS2 mixed crystals (0 <= x <= 1) have been studied by means of transmission and reflection measurements in the wavelength range of 400-1100 nm. The optical indirect band gap energies were determined through the analysis of the absorption data. It was found that the energy band gaps increase with increasing of gallium atoms content in the TlGaxIn1-xS2 mixed crystals. From the transmission measurements carried out in the temperature range of 10-300K, the rates of change of t...
Citation Formats
Z. Gogebakan, H. Yücel, and A. Culfaz, “Crystallization field and rate study for the synthesis of ferrierite,” INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, pp. 2006–2012, 2007, Accessed: 00, 2020. [Online]. Available: