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Notes

Temperature-Programmed Desorption for Catalyst Characterization

Bibliography
 
1.   Absi-Halabi, M. and A. Stanislaus, “Effect of Phosphorus on the Acidity of  y-Alumina and on the Thermal Stability of y-Alumina Supported Nickel-Molybdenum Hydrotreating Catalysts”. Applied Catalysis. 39, pp 239- 253 (1988).

CHARACTERIZATION OF MICROPOROUS MATERIALS By Carlos A. Leon y Leon D.

All solid powders, and in particular those with apparent surface areas > 400 m2/g, are bound to contain micropores. The importance of micropores lies in that materials containing micropores generally have most of their apparent surface area residing in them. Hence, all applications of materials (adsorbents, catalysts) that depend on their accessible surface area must deal with the possible effects arising from the presence of micropores in the materials.

MEASURING ACIDITY IN ZEOLITES USING TPD

Temperature-programmed desorption (TPD) of basic molecules from the surface of zeolites has been extensively used to measure their acid properties. The TPD experiment consists of sorbing a base molecule on the material of interest and, while flushing the surface with an inert gas, linearly ramping the temperature and measuring the desorption of the base. By quantitatively measuring the amount of base desorbed and noting the temperature(s) of desorption, information can be obtained on both the intrinsic and extrinsic acid properties in a single experiment (See Figure 1).