Abstract
A combined technique employing transmission infrared spectroscopy (IR) and temperature-programmed desorption (TPD) has been used to study the interaction of a gaseous base with a series of acidic microporous catalyst surfaces. This technique was used to establish the firstorder kinetics for pyridine desorption from silica-alumina gel catalysts covering a wide range of compositions. This combined technique has also allowed more detailed information about number, type, and strength of acid sites on catalysts to be obtained in a single experiment. The special measuring system that allows simultaneous transmission infrared monitoring and temperature-programmed desorption from catalysts is described. The results of applying this combined technique to a model silica-alumina catalyst system are shown. Insight into the mechanism for the desorption of both Lewis and Brønsted chemisorbed pyridine was deduced from the TPD results. A model for pyridine desorption is presented and discussed.
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