CHARACTERIZATION OF ALPO4-14 BY MAGIC-ANGLE-SPINNING NUCLEAR-MAGNETIC-RESONANCE SPECTROSCOPY AND THERMOANALYTICAL AND ADSORPTION MEASUREMENTS

AIPO4-14 has been prepared using piperidine as templating agent. Uniform crystals of tabular habit were obtained. By thermoanalytical measurements of the as-synthesized sample the content of occluded piperidine was determined and its degradation was followed. From the P-31 MAS NMR spectra it follows that there should exist at least three non-equivalent sites in the framework of calcined AIPO4-14. Completely reversible changes in the Al-27 and P-31 MAS NMR spectra were found in dehydration/hydration cycles. The relative small pore diameter of AIPO4-14 (ca. 0.4 nm) prohibits the adsorption of n-alkanes. From the adsorption isotherms of methanol and water the saturation capacities were determined to be 0.17 and 0.27 cm3 g-1, respectively.