SYNTHESIS OF MNAPO-20, COAPO-20, NIAPO-20, AND CUAPO-20 USING TETRAHEDRAL TETRAHALOMETALLATES

Highly crystalline MnAPO-20 and CoAPO-20 have been prepared at previou sly unreported substitution levels using tetrahedral tetraharometallat es. X-ray diffraction and infrared spectroscopy indicate that framewor k substitution of manganese and cobalt has taken place. Samples have a lso been studied using X-ray fluorescence, scanning electron microscop y, thermogravimetric analysis, and a Gouy balance. MnAPO-20 and CoAPO- 20 synthesized with metal(II) acetates using the same molar ratios wer e not as pure as those synthesized using the tetrahedral complexes eve n at tow substitution levels. Interplanar spacings and unit cell sizes were found to be smaller in these traditionally prepared AlPO4-20 ana logs, indicating less framework incorporation of the transition metal. NiAPO-20 and CuAPO-20 have also been prepared by this method, althoug h framework substitution of Ni(II) and Cu(II) is not confirmed.