Pseudoboehmite

Calvet et al. coined the name pseudoboehmite in 1952 when they synthesized pure aluminium hydroxyde gel.

Pseudoboehmite is essentially finely crystalline boehmite which consists of the same or similar octahedral layers in the xz plane but lacks three-dimensional order because of a restricted number of unit cells in y direction.

The higher water content compared to boehmite can be explained by a smaller crystallite size.

[5] At higher temperatures pseudoboehmite is transformed to γ-alumina but the pore size distribution remains unchanged up to 1000 °C.

Pseudoboehmite can be synthesized by aging non-crystalline aluminium hydroxide gels at pH values between 5.0 and 7.4.