Novel small pore aluminophosphates molecular sieves AlPO4-Atm1, AlPO4-Atm2 and AlPO4-Atm3 have been synthesized using hexamethyleneimine template at atmospheric pressure (373K) for the first time. Gel composition Al2O3: P2O5: 1.16HEM: 45H2O was taken as the standard one which gives AlPO4-Atm12. Change in water molar ratio to 67.5 gives AlPO4-Atm2. On changing the aluminium source from catapal B to aluminium isopropoxide in same molar gel composition gives AlPO4-Atm3. All the materials were characterized by XRD, SEM, TG/DTA, C & N analysis, FT-IR and MASNMR analysis. Elemental analysis shows that Al and P are in equal molar composition. XRD analysis shows that the synthesized samples are highly crystalline and new. SEM shows the morphology change with structure. TG/DTA analysis reveals the presence of maximum four stage elimination of templates. Carbon and nitrogen analysis gives the amount of template present in the sample. 27Al MASNMR shows the presence of single type tetrahedrally co-ordinated aluminium atoms in AlPO4-Atm1. 31P MASNMR of the same sample shows the presence of two type of tetrahedrally co-ordinated phosphorous atoms.
