Influence of nature of silica source on template-free synthesis of ZSM-5

Date

2001-01-01

Author

Kalıpçılar, Halil

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

135
views

0
downloads

Synthesis of ZSM-5 from template-free batches which preceded the preparation of template-free ZSM-5 layers on porous supports was studied to ascertain the effect of nature of silica source on the purity of template-free ZSM-5. Silicic acid and two colloidal silica sols were used as silica sources to prepare the template-free batches with a molar composition of 6.5Na(2)O:Al2O3:80SiO(2):3196H(2)O. One of the colloidal silica sols contained methanol as stabilizer while the other did not. The product purity and rate of crystallization increased when colloidal silica sols were used as silica source, however, use of silicie acid led to low purity and slow crystallization rate. The methanol in the colloidal silicic sol appeared to act as template to promote the crystallization and was occluded in the resultant ZSM-5 pores. The dissolution of the meta-stable ZSM-5 phase and formation of quartz was observed regardless of the nature of the silica source in case of prolonging the crystallization time more than 90 h at 200 degreesC.

Subject Keywords

General Materials Science, General Chemistry, Condensed Matter Physics

URI

https://hdl.handle.net/11511/40546

Journal

CRYSTAL RESEARCH AND TECHNOLOGY

DOI

https://doi.org/10.1002/1521-4079(200111)36:11<1197::aid-crat1197>3.0.co;2-d

Collections

Department of Chemical Engineering, Article

Suggestions

OpenMETU
Core

Influence of ion implantation on structural and photoconductive properties of Bridgman grown GaSe single crystals KARABULUT, ORHAN; Parlak, Mehmet; Turan, Raşit; SERİNCAN, UĞUR; Akınoğlu, Bülent Gültekin (Wiley, 2006-03-01) The structure and temperature dependent spectral photoconductivity of as-grown and N-and Si-implanted GaSe single crystals have been studied. It was observed that post-annealing results in a complete recovery of the crystalline nature that was moderately reduced upon implantation. The band edge is shifted in the implanted sample which is attributed to the structural modifications and continuous shallow levels introduced upon implantation and annealing. Our calculations showed that the trap density is increa...
Effects of annealing on structural, electrical and optical properties of AgGa(Se0.5S0.5)(2) thin films deposited by using sintered stoichometric powder KARAAĞAÇ, HAKAN; Parlak, Mehmet (Wiley, 2009-04-01) The structural, electrical and optical properties of AgGa(Se0.5S0.5)(2) thin films deposited by using the thermal evaporation method have been investigated as a function of annealing in the temperature range of 450-600 degrees C. X-ray diffraction (X-RD) analysis showed that the structural transformation from amorphous to polycrystalline structure started at 450 degrees C with mixed binary phases of Ga2Se3, Ga2S3, ternary phase of AgGaS2 and single phase of S. The compositional analysis with the energy disp...
Effects of CdCl2 treatment on properties of CdTe thin films grown by evaporation at low substrate temperatures BACAKSIZ, EMİN; ALTUNBAŞ, MUSTAFA; Yflniaz, S.; Tornakin, M.; Parlak, Mehmet (Wiley, 2007-09-01) The structural, morphological and optical properties of vacuum-evaporated CdTe thin films were investigated as a function of substrate temperature and post-deposition annealing without and with CdCl2/treatment at 400 degrees C for 30 min. Diffraction patterns are almost the same exhibiting higher preferential orientation corresponding to (111) plane of the cubic phase. The intensity of the (111) peak increased with the CdCl2/annealing treatment. The microstructure observed for all films following the CdCl2/...
Effect of gramicidin S on the dipalmitoylphosphatidyl-glycerol thermotropic phase transition in DPPG/GS systems: A mathematical approach Stan, Cristina; Cristescu, C. P.; Severcan, Feride; Dorohoi, Dana (Informa UK Limited, 2006-01-01) We present a mathematical approach to the experimental data recorded via Fourier transform-infrared spectroscopy regarding the influence of the concentration of the antimicrobial peptide gramicidin S (GS) on the thermotropic phase transition of the dipalmitoylphosphatidyl-glycerol (DPPG) lipid bilayer membrane in DPPG/GS systems. The model is based on the influence of the GS concentration on the parameters of a nonlinear damped oscillator, which models the CH2 symmetric stretching band.
Synthesis of aromatic poly(pyridinium salt)s and their electrochromic properties Keshtov, M. L.; UDUM, YASEMİN; Toppare, Levent Kamil; Kochurov, V. S.; Khokhlov, A. R. (Elsevier BV, 2013-05-15) Synthesis of a series of new conjugated electrochromic polymeric pyridinium salts containing main-chain triphenylamine and their electrochromic properties were demonstrated. All polymers exhibit intense UV absorptions at 336-338 nm in DMF and 340-343 nm in thin film form and fluorescence centered at 410-438 nm in DMF and 460-461 nm in thin film form. The electrochromic properties of the films were investigated by electrochemical and spectroelectrochemical methods. Reversible redox signals with stable electr...

Citation Formats

H. Kalıpçılar, “Influence of nature of silica source on template-free synthesis of ZSM-5,” CRYSTAL RESEARCH AND TECHNOLOGY, pp. 1197–1207, 2001, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/40546.