Adsorption in the liquid phase

Article Abstract:

Ni/Al2O3 catalysts with metal content between 0.4 and 3 wt % were prepared using nickel acetylacetonate as precursor to study the interactions between the metal complex and the support. Infrared spectroscopy showed that coordinately unsaturated Al3+ sites, hydroxyls of the support surface and probably basic oxygens are involved in the interaction. Results also showed that monolayer coverage occured at a about 0.8%-1% Ni loading while piling in multilayers was observed at higher content.

Adsorption, Coordination compounds

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DRIFTS study of platinum aluminophosphate oxynitride catalysts

Article Abstract:

A study was conducted to examine the surface structure and stability of fresh and minimized Pt-AlPON catalysts using diffuse reflectance infrared spectroscopy. The ICP-AES Philips PV8250 spectrometer was utilized to determine the amount of platinum while platinum dispersion was obtained by H2 chemisorption. Results indicated quantitative differences among the catalysts. In addition, the reduction process of the metallic phase led to a critical loss of specific surface area.

Usage, Platinum, Surfaces (Materials), Infrared spectroscopy, Surfaces (Technology)

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Platinum aluminophosphate oxynitride (Pt-AIPON) catalysts. Consequences of surface hydrolysis and heating processes on the structure

Article Abstract:

A study was conducted to analyze consecutive heating and cooling cycles over a platinum aluminophosphate oxynitride catalyst supporting a high nitrogen content. Diffuse reflectance infrared spectroscopy was utilized to carry out the analysis. The high surface area amorphous precursor was prepared from two aqueous solutions. Results indicated that the catalyst loses all its nitrogen content to reach a structure similar to that of its AlPO4 precursor.

Aluminum, Aluminum (Metal), Hydrolysis

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