Metal-support interactions in zeolite-supported noble metals: Influence of metal crystallites on the support acidity

Article Abstract:

The metal-support interactions on a series of catalysts of different acidities, including platinum-modified zeolites and H-MCM-41, are determined by means of XPS, CO and pyridine adsorption and a model reaction. The results have shown that the interactions between the platinum and the support are mutual and the changes in the electronic properties of the supported platinum crystallites are evidenced by the shifts of the Pt binding energy in XPS and of the stretching frequency of linearly adsorbed CO.

Precious Metal Compounds, Analysis, Acidity function

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Influence of V content on the nature and strength of acidic sites in VSibeta zeolite evidenced by IR spectroscopy

Article Abstract:

VSibeta zeolites prepared by a two-step photosynthesis method are characterized by physical techniques to study the effect of V content on the nature and environment of V species. Studies reveal that only about half of the V introduced into zeolite is able to form either Bronsted or Lewis acidic sites and IR results of CO adsorption, three kinds of Lewis acidic sites on different acid strength could be distinguished in VS beta zeolites related to framework tetrahedral and extra-lattice octahedral.

Science & research, Research, Photosynthesis

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Selectivity of a model zeolite ring over hydrocarbons with different symmetry, travelling with different orientations and speeds

Article Abstract:

The dynamical character of the selectivity is investigated with the diffusion of different hydrocarbons through the zeolite ring model. The selectivity of zeolites is intimately associated with the diffusion of the hydrocarbons within the zeolitic channels and these findings would help in understanding mass transport, in analyzing the factors that control the catalytic activity in zeolites and for the parametrization of model potentials.

Methods, Hydrocarbons, Catalysis

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