Nondestructive identification of colloidal molecular sieves stabilized in water

Article Abstract:

The crystallization process of colloidal (nanosized) molecular sieves stabilized in water with Raman and (super 13)C NMR spectroscopic methods was investigated by using the encapsulation of small quaternary ammonium ions in zeolite framework. The molecular packing effect and restricted mobility resulted in the shifts and substantial broadening of the (super 13)C NMR signals and, position changes and relative intensities of the Raman peaks.

Zeolites, Nuclear magnetic resonance spectroscopy

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A model for the structure of MCM-41 incorporating surface roughness

Article Abstract:

An alternate model of MCM-41 based on molecular simulations is presented giving values to surface area that are in closer agreement to those determined by experiments. The structure of interstitial silicates between the mesopores produces a level of surface roughness that increases the surface beyond its nominal value, calculated by assuming smooth pores.

Silicates, Porous materials, Structure, Atomic properties, Surface roughness

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Synthesis, characterization and catalytic performance of Cr-incorporated aluminoborate octahedral molecular sieves

Article Abstract:

A series of Cr-incorporated PKU-1 molecular sieves (Cr-PKU-1) are synthesized by using boric acid as a flux, and the physicochemical properties are characterized by XRD, ICP, SEM, XPS, UV-vis, and NH(sub 3)-TPD methods. The syntheses of the Cr-incorporated PKU-1 can be realized directly by reactions in the boric acid flux.

Boric Acid, Chemical synthesis, Properties

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