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What is the meaning of the dispersion of noble metal catalysts

Hits:Updated:2016-04-12 14:04:08【Print】

The proportion of the total number of atoms in the catalyst is accounted for by the number of atoms exposed on the surface of the catalyst.

Physical method and chemical method for the determination of the degree of dispersion:

The physical method is to directly observe the particle size (by electron microscope or XRD), and the dispersion degree of the metal can be calculated by the formula.

The chemical methods through noble metal surface selective adsorption of a model molecule (the premise is to have an accurate understanding of the stoichiometric ratio) and by quantification of adsorbed gas molecules can be calculated from the atomic number of the metal surface. Common H2 and CO molecules as model gases.



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