Dedicated to Professor Dr. M. Baerns on the ocassion of his 60th birthday This paper presents results of temperature-programmed desorption (TPD) as a method for studying the acid and shape-selective properties of small-and intermediate-pore zeolites.A combination of an in situ infrared spectrometer and a downstream gas chromatograph for analyzing the desorption products is used to detect the desorption process. This is followed by a separate, newly installed microbalance facility.The studies show that a part of the amines, esp. dimethylamine (DMA) and trimethylamine (TMA), adsorbed on the zeolites undergo decomposition, disproportionation and carbonization reactions during the TPD measurement at elevated temperatures. Comparison of the microbalance measurements and the gas chromatographic results give a good picture of the extent of these reactions.
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