An x-ray absorption fine structure study of the sulfidation behavior of CoNaY prepared by ion exchange: the influence of physisorbed water and cobalt loading

Article Abstract:

A study was conducted to analyze the effects of physisorbed water on the sulfidation of a cobalt supporting an ion exchanged CoNaY catalyst. X-ray absorption near edge structure, extended X-ray absorption fine structure, and high resolution electron microscopy were carried out to determine the effects. Experimental results indicated that the sulfidation of ion exchanged Co(4.0)NaY during the presence of physisorbed water supported the formation of large and well structured Co9S8 species at the outer NaY surface.

Water, Ion exchange, Cobalt, Sulfidation

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Chemical bonding in polyethylene-nanotube composites: a quantum mechanics prediction

Article Abstract:

The possible bonding of polyethylene-nanotube is investigated with the help of quantum mechanics analysis. The results indicate that covalent bonding between an alkyl radical and a nanotube is energetically favorable, and hence a high-stress transfer can be realized in polyethylene-based carbon nanotube composites in the presence of free-radical generators.

Quantum theory, Quantum mechanics, Nanotubes

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Study of the activation of C-H and H-H chemical bonds by the [ZnOZn](super 2+) oxycation: Influence of the zeolite framework geometry

Article Abstract:

The reactivity of the [ZnOZn](super 2+) oxycation, located inside the zeolite micropores, is studied by the periodical density functional method. It is found that the [ZnOZn](super 2+) cation is able to activate both C-H and H-H bonds. These results confirm that this active site is present in high-silica zeolites.

Zinc oxide, Chemical properties

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