Assembly of Hydrothermally Stable Aluminosilicate Foams and Large-Pore Hexagonal Mesostructures from Zeolite Seeds under Strongly Acidic Conditions

Although the assembly of aluminosilicate foams and large-pore hexagonal mesostructures from zeolite BEA, MFI, and FAU seeds requires a reduction in pH from initially very basic values (pH > 12) to acidic values in the range <2.0−6.5, the protozeolitic nanoclusters persist under these conditions and substantially improve the hydrothermal stability of the resulting mesostructures when exposed to 20% steam at 800 °C.