Template-free synthesis of ZSM-5 type zeolite layers on porous alumina disks

ZSM-5 crystals were synthesized from template-free batches oil macroporons alpha-alumina (risks. The SiO2/Al2O3 ratio of the synthesis gel influenced the crystal morphology, surface coverage and intergrowth among the crystals. Prismatic ZSM-5 crystals covered the disk surface when the SiO2/Al2O3 ratio of the batch was higher than too, whereas spherical polycrystalline particles of ZSM-5 were obtained from batches with a SiO2/Al2O3 ratio of 80. Mordenite type zeolite was formed on the disk surface due to the incorporation of alumina dissolved from the disk when the time of crystallization was extended. The effects of silica source and seeding of the support surface with 0.3 and 2 mu m ZSM-5 crystals on the morphology of seolite layer were also investigated. The purity, surface coverage and SiO2/Al2O3 ratio of ZSM-5 crystals increased in the order of silica sol containing methanol, silica sol, and silicic acid. Seeding decreased the length of prismatic ZSM-5 crystals from 45 mu m 10 mu m and increased the surface coverage.


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Tufan, Evrim Özdem; Durucan, Caner; Department of Metallurgical and Materials Engineering (2013)
Sol-gel processing routes for the synthesis of antibacterial silver-doped silica (Ag-SiO2) powders from an inorganic precursor, sodium silicate (Na2SiO3, water glass), have been established. For the synthesis of SiO2 powders, two different processing approaches were used. In the first one (indirect synthesis), silver ions were incorporated into the immature wet silica gels obtained from sodium silicate by the exposure of the silica gels to aqueous silver nitrate (AgNO3) solutions. In the second one, silver ...
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Pozzolanic activity of clinoptilolite, the most common natural zeolite mineral, was studied in comparison to silica fume, fly ash and a non-zeolitic natural pozzolan. Chemical, mineralogical and physical characterizations of the materials were considered in comparative evaluations. Pozzolanic activity of the natural zeolite was evaluated with various test methods including electrical conductivity of lime-pozzolan suspensions; and free lime content, compressive strength and pore size distribution of hardened...
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The extraction procedures for the determination of polycyclic aromatic hydrocarbons (PAH) concentrations in sediment samples had been developed by using GC-FID and GC-MS. The optimized methods were soxhlet extraction, ultrasonic bath extraction and solid phase micro extraction (SPME). In order to search out the main factors affecting extraction efficiencies of the methods, factorial design was used. The best extraction method was chosen and optimum values for main factors were selected for the development o...
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Citation Formats
H. Kalıpçılar, “Template-free synthesis of ZSM-5 type zeolite layers on porous alumina disks,” TURKISH JOURNAL OF CHEMISTRY, pp. 233–242, 2007, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/55959.