Surface characterization of catalytic materials by positron anni

Details Surface characterization of catalytic materials by positron anni Surface characterization of catalytic materials by positron anni

1994-05-09

1996-06-25

Berman, Jack I.

Radiant energy

Inspection of solids or liquids by charged particles

Methods

250308, 25036303, G01N 2322

Patent

active

055302459

ABSTRACT:
Positron annihilation radiation lineshapes from two-dimensional angular correlation and Doppler broadened spectrum measurements are used to monitor specific surface acidity (proton concentration per unit surface area) of catalytic materials with large internal surface areas. Annihilation gamma lineshape parameter increases with internal surface area and decreases with specific surface acidity as a result of oxidation of positronium atoms at the surface by protons. These results point to a new and effective method for specific surface acidity valuations.

REFERENCES:
patent: 4864131 (1989-09-01), Rich et al.
patent: 4897549 (1990-01-01), Zerda et al.
patent: 5015851 (1991-05-01), Singh et al.
patent: 5200619 (1993-04-01), Asoka-Kumar et al.

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