Synthesis of mesoporous aluminophosphates-based materials using various copolymers as templates

• Mesoporous aluminophosphates synthesized using poly(styrene-co-allyl alcohol).
• Pore diameter and wall thickness influenced by the PEO/PPO ratios.
• The absence of the second PEO block did not affect the micelle formation.

The aim of this work was to study the effect that various copolymers and several synthesis conditions may have on the properties of mesoporous aluminophosphates obtained using AlCl3 and H3PO4 as aluminium and phosphorous precursors, respectively under non-aqueous conditions. Poly(styrene-co-allyl alcohol) and various triblock type copolymers were used as structure-directing agents in an acidic medium. The parameters investigated using the poly(styrene-co-allyl alcohol) included stirring time, Al/P mole ratio, synthesis time at 40 °C, calcination temperature and the type and amount of polymer used. The resulting materials were characterized by nitrogen adsorption at −196 °C, X-ray diffraction (XRD), temperature-programmed ammonia desorption (TPD-NH3) and transmission electron microscopy (TEM). Mesoporous aluminophosphates with surface areas up to 540 m2/g were obtained.

Figure optionsDownload as PowerPoint slide