نتایج جستجو برای: structure zeolite
تعداد نتایج: 1575663 فیلتر نتایج به سال:
Many eff orts to improve the performance of heterogeneous catalysts and adsorbents focus on creating materials that are highly active and selective for their target reactants and products. Th is typically involves the use of porous solids with high surface areas, for instance crystalline or amorphous inorganic compounds, whose diff usional access, adsorption, and reaction properties depend stro...
gamma and (b) alpha cage in zeolite ZK5. 2. Methodology The structure model of the zeolite H-ZK5 was obtained by an optimization using the semi-empirical method MNDO, since no experimental structure data were available. Moreover, the influence of the electric field of the proton has been examined. Two clusters were selected from the optimized zeolite structure, the neutral (Si2O7H6) and the aci...
The refinement of the crystal structure of Theigarhorn epistilbite showed the presence of two tetrahedral configurations, as in Elba dachiardite. These two configurations, obtained by the rotation of two tetrahedra around one edge, have both C2 symmetry, with different frequency (82% and 18% respectively), thus the resulting space group is C2. The presence of these two acentric domains is inter...
In recent years, natural substances such as zeolite have been used to absorb heavy metals in soil in an attempt to decrease their availability to plants. Compared to other techniques, the use of zeolite is fast, clean, and inexpensive. This research was carried out to investigate the effects of an Iranian natural zeolite (clinoptilolite) on stabilizing Cd-contaminated soil treated with 0.01 M C...
We review recent molecular modeling efforts to shed light on the mechanisms of zeolite formation. We focus on studies that model the early stages of silica polymerization and zeolite nucleation. Electronic structure calculations, classical molecular dynamics, atomistic Monte Carlo simulations and Monte Carlo simulations of lattice models have been used to probe the formation of zeolites and mes...
Two-dimensional zeolite nanosheets that do not contain any organic structure-directing agents were prepared from a multilamellar MFI (ML-MFI) zeolite. ML-MFI was first exfoliated by melt compounding and then detemplated by treatment with a mixture of H2 SO4 and H2 O2 (piranha solution). The obtained OSDA-free MFI nanosheets disperse well in water and can be used for coating applications. Deposi...
The combination of advantages of using zeolites and gold nanoparticles were aimed to be used for the first time to improve the characteristic properties of ion selective field-effect transistor (ISFET)-based creatinine biosensors. The biosensors with covalently cross-linked creatinine deiminase using glutaraldehyde (GA) were used as a control group, and the effect of different types of zeolites...
A novel crystalline binary phase is reported in the Na-Ge system, with an entirely new, zeolite-like crystal structure solved and refined by the combination of synchrotron X-ray and neutron powder diffraction techniques.
Hydroxy davyne is a hydrated aluminosilicates with the same structure as cancrinite mineral group. Scientist categorized hydroxy davyne as zeolite because of its low temperature formation conditions and hydrated structure. Existence of [Ca.Cl] + group instead of [Na.H2O] + group is the significant property of this mineral. Alteration of volcanic ash in presence of alkaline hydrothermal solution...
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