Comparative quantum chemical study of stabilization energies of Zn(super 2+) ions in different zeolite structures

Article Abstract:

The experiment was done where the clustered model quantum chemical calculations were performed to compare the stabilization energies of Zn(super 2+) ions in four-, five- and six-membered zeolite rings. The results show that the stabilization energy decreases substantially in different zeolite rings and this trend is useful to study adsorption energy and reactivity of Zn(super 2+) in cationic sites of different zeolites.

Chemistry, Analytic, Analytical chemistry, Chemical reactions

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Crystallographic study of the reaction of zinc vapor with fully Cd(sub 2+) exchanged zeolite X. Complete reduction of Cd (sub 2+) by Zn, extraction of Si)4(super 4-) and AiO4(super 5-) from the zeolite framework, and reduction of Si(super4+) to Si

Article Abstract:

The reduction of all Cd(super 2+)ions by Zn vapor at 480 degree C , and some Si(super 4+)ions, in a single crystal of fully dehydrated fully Cod(super 2+) exchanged elite X (Cd46Si100Ai92O384 per unit cell) is investigated. The approximate unit-cell composition of the product crystal is found to be Zn64Si96Ai96O384.7SiO4(super 4-),1AiO4(super 5-) (a0=24.713(3) angstrom).

Primary nonferrous metals, not elsewhere classified, Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum), Cadmium, Electric properties, Crystallography, Zinc

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Self-diffusivities of N2, CH4 and Kr on 4A zeolite pellets by isotope exchange techniques

Article Abstract:

The isotope exchange technique (IET) was used to measure equilibria and kinetics for adsorption of pure N2, CH4 and Kr on a 4A zeolite sample. The intracrystalline self-diffusive for these gases are measured under truly isothermal conditions. The self-diffusivities of Kr and CH4 are smaller than that of N2 by 2 and 1 order of magnitudes, respectively.

Observations, Gases, Chemistry, Physical and theoretical, Physical chemistry, Gas adsorption

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