Methods for characterizing zeolite acidity

Article Abstract:

Zeolites are a potentially suitable medium for a large range of selective catalytic reactions and absorptive separations. The study of acid-catalyzed reactions in zeolites based on realistic potentials requires that demarcation between acidity, an equilibrium thermodynamic concept, and activity, a composite kinetic concept should be made clear. Methods for characterizing zeolite acidity, including spectroscopy, alkane cracking, amines, and stochiometric complexes are described.

Methods, Heterogeneous catalysis

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Zeolithic and layered materials

Article Abstract:

The synthesis, characterization and applications of zeolitic and layered materials is described. The synthetic procedures discussed focuses on the use of new methods and materials that have a three-dimensional and two- dimensional structure. The characterization of the zeolitic and layered materials can be achieved by magnetic, optical, structural, microscopic and thermal methods. Present application includes catalysis, photochemistry and electrochemistry.

Spectrum analysis, Spectroscopy, Thermal analysis, Layer structure (Solids)

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Physical aspects of photochemistry and radiation chemistry of molecules adsorbed on SiO2, gamma-Al2O3, zeolites, and clays

Article Abstract:

The physical aspects of molecular system absorbed in SiO2, gamma-Al2O3, zeolites and clays are discussed. High-energy excitation can be used to selectively energize components of higher electron fractions in isolated areas of solids and transfers excitation energy to the absorbed molecule which leads to creation of ions and radicals. Mobility of reactants in solids is slower under low-energy excitation states.

Reports, Photochemical research, Radiation chemistry, Adsorption, Excited state chemistry

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