Characterization of Small- and Intermediate-Pore Zeolites by Means of Temperature-Programmed Desorption of Amines

摘要

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 fol-lowed 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 carbon-ization 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