Spectroscopy of the Formation of Microporous Transition Metal Ion Containing Aluminophosphates under Hydrothermal Conditions

The coordination environment of transition metal ions can be monitored during the synthesis of molecular sieves at high pressures and temperatures by using the apparatus shown, which allows the measurement of diffuse reflectance and electron spin resonance spectra in situ. The spectroscopic data obtained allow a better understanding of the hydrothermal crystallization process of CoAPO-5 molecular sieves in terms of the coordination chemistry of Co2+ in the synthesis gel.