The Brønstead acidity of zeolites and other catalysts is of keen interest, as this affects the kinetics of reactions. Characterization of these sites is consequently very important and is often performed according to the ASTM D 4824 ammonia chemisorption method. An alternative, but comparable, characterization method involves pulse chemisorption of propylamines followed by a temperature-programmed desorption (TPD) combined with a mass spectrometry analysis of propylene. A complete characterization analysis can be performed using the AutoChem analyzer with the mass spectrometer and vapor generator accessories.
The Brønstead acidity of zeolites and other catalysts is of keen interest, as this affects the kinetics of reactions. Characterization of these sites is consequently very important and is often performed according to the ASTM D 4824 ammonia chemisorption method. An alternative, but comparable, characterization method involves pulse chemisorption of propylamines followed by a temperature-programmed desorption (TPD) combined with a mass spectrometry analysis of propylene. A complete characterization analysis can be performed using the AutoChem analyzer with the mass spectrometer and vapor generator accessories.
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