Abstract
Abstract Magnesium aluminophosphate (MAPO-5) molecular sieve was synthesised hydrothermally and ion-exchanged with Lewis acid metal ions such as Ga 3+ , In 3+ , La 3+ and Ce 3+ by wet method. The materials were characterised using XRD, FT-IR, SEM, TPD (ammonia) and TGA. The XRD patterns of ion-exchanged molecular sieves are similar to the parent MAPO-5 thus showed absence of structural degradation and non-framework metal oxide phase during ion-exchange. The thermograms of metal ion-exchanged MAPO-5 showed a weight loss between 550 and 600 °C which is assigned to the decomposition of M ( OH ) 2 + into MO + species. The total acidity of materials decreased after ion-exchange as revealed from TPD (ammonia) studies. Their catalytic activity was tested in the solvent free synthesis of coumarin.
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