Interaction of Methylamine with Highly Siliceous MFI, FAU and FER‐type Zeolites

Abstract

AbstractThe adsorption of methylamine on highly siliceous MFI, FAU and FER‐type zeolites was investigated with XRD, FT‐IR, Raman, 13C and 29Si MAS NMR, and compared with the adsorption of methanol. As the adsorption of the amine, the relative intensity of XRD peaks of the zeolites has been changed significantly, the high‐resolution 29Si MAS NMR peaks have been broadened and shifted to low field, and the resonance of SiOH groups has appeared. The vibration of NH has been shifted to low frequency and CN vibration moved to high frequency in the IR spectra, and the 13C resonance peak broadened and shifted to high field for the adsorbed amine. The facts reveal an associating interaction between the perfect framework of the zeolites and the adsorbed methylamine with hydrogen bonds, leading to the formation of SiOH groups and the high desorption temperature of the methyl‐amine from the zeolites.