By a vapor phase transport synthesis method, the aluminophosphate solid gel has been transformed into a 3-dimensional aluminophosphate framework under pyridine atmosphere. It’s structure was solved by X-ray single crystal diffraction, which shows that the compound [Al3P3O12F][C5H5NH]•0.2H2O crystallizes in a triclinic system, space group P-1(2) with cell parameters a＝9.127(2) Å, b＝9.185(3) Å, c＝9.346(2) Å, α＝85.563(14)°, β＝77.346(6)°, γ＝89.628(17)°, V＝762.2(4) Å3, Z＝2, Dc＝2.074 Mg/m3, Mr＝468.09, F(000)＝474 and μ＝0.64 mm－1. Its structure is identical to that of the previously reported compound UT-6, the fluorine ions as a component of starting gel are introduced into the framework and bridge the Al atoms, and the independent 8-ring channels in the framework are interconnected to constitute cage structures analogous to AlPO4-CHA zeolite-like. The results from XRD and TG-DTA analyses indicate that the sample has higher thermal stability, and its framework structure is intact after calcination at 400 ℃.

Key words: vapor phase transport (VPT), aluminophosphate, molecular sieve, synthesis, characterization