The ever increasing energy demand in developing world will result in sustainable increase in the fly ash generation, which will remain a cause of concern as far as its management is concerned. However, technological advance may prove to be effective in fly ash management as well as its possible utilization through the zeolites. The zeolites are known to possess many beneficial properties (such ...

The principles and advantages of the dry-gel conversion (DGC) method are described for the synthesis of zeolites Beta and EU-1 with different aluminum and gallium contents in the framework. By modern analytical techniques, the processes occurring during the conversion of a dry gel into zeolite particles were investigated. In the case of the dry-gel synthesis of zeolite [Ga]Beta, XRD indicated a...

A zeolite-catalyzed, simple, one-pot, solvent-free, cost effective, and environmentally benign process for the synthesis of dihydropyrimidones is described. This reaction is scaleable to multigram scale and the catalyst is recyclable. This methodology has resulted in an efficient synthesis of monastrol, a potent inhibitor of kinesin Eg5.

A facile and convenient protocol was developed for the fast (2.5-3.5 h) and high yielding (70-90%) synthesis of fused 1,4-dihydropyridines from dimedone in the presence of HY-zeolite as an efficient recyclable heterogeneous catalyst.

aluminophosphate-5 (alpo4-5) nano-pore zeolite was synthesized. the effect of alteration in precursor gel preparation on the morphology of zeolite was studied. the effect of variety of synthesis conditions on the purity, crystal and pore size, and crystallinity of alpo4-5 zeolite been studied. a hydrothermal synthesis has been used to produce nano-pore aluminophosphate-5 crystals. the crystals ...

Abstract In this work hydrothermal synthesis of zeolite NaA crystals with a composition of Al2O3:aSiO2:bNa2O:cH2O was investigated. Effects of SiO2/Al2O3, Na2O/Al2O3 and H2O/Al2O3 ratios and crystallization temperature and time were studied on crystallinity and crystal size of zeolite NaA crystals. It was tried to understand the interactions between these parameters. The crystal species o...

A new synthesis route, based on the silanization of zeolitic seeds, has been applied to prepare nanocrystalline TS-1 zeolite with hierarchical porosity, leading to materials exhibiting high catalytic activity in 1-octene epoxidation with organic hydroperoxides as oxidizing agents.

in this paper we report synthesis of fe2tio5-5a zeolite (z5a) nanocomposites with 5%, 10% and 20% weight percent of fe2tio5 in 5a zeolite in stearic acid media after calcination of the gel samples obtained at 600-900°c for 2 hrs. the powder x-ray diffraction (xrd) patterns have been used for characterization of the prepared samples. the scanning electron microscopy (sem) images and x-ray energy...

Nanosized zeolite crystals (nanozeolites) with narrow particlesize distributions and sizes less than 100 nm have received much attention because of their great potential applications in catalysis and adsorption. The decrease in the crystal sizes results in high external surface areas, reduced diffusion path lengths, and more exposed active sites. For example, small Y-type zeolite crystals have ...

Ahstraet--Uranyl acetate solutions, ranging in concentration from about 100 ppm to 3700 ppm, were reacted with the Na-, K-, and Caforms of zeolite A. The crystalline products from the Naand K-A zeolites resembled compreignacite (K~O-6UO3' l lH~O) and from the Ca-A, becquerelite (CaO'6UO3. l lH~O). With higher concentrations of uranyl acetate, only X-ray-amorphous products were obtained. The com...