Crystallization of Porous Aluminophosphates and Metal Substitutions

摘要: Abstract Crystallization phenomena of a series the molecular sieves MeAPO 4 -5 and MeASPO-5 have been studied under influence different Mecomponents. As Me components Be, Mg, Zn, Ni Fe used. These offered in some excess to study extent incorporation which was determined by SEM-EDAX at product crystals. For Be Mg almost no on kinetics crystallization can be observed compared with pure ALPO batch. enters structure about 0.12 MgO for one Al 2 O 3 P 5 unit. A batch Zn shows reduced crystallinity cocrystallization an unknown phosphate. The ZnO content crystals same molar ratio as MgO. Extended experiments NiO show that is not incorporated into SAPO-5 In presence crystallize undergo recrystallization cristobalite like phase. both valency states taking up 0,1 unit structure. Generally Me-ions favours denser phosphate phases or tridymite.