Two new four-connected zeolite-like magnesium aluminophosphates with intersecting 8-ring channels

摘要

Two new Mg-containing aluminophosphates JU94 and JU95 (vertical bar C4H12N2 vertical bar[Mg2Al6(PO4)(8)(H2O)(4)]) have been hydrothermally synthesized in the same reaction system of MgO-Al2O3-P2O5-piperazine-H2O. Both of their structures are constructed by the connection of AlO4/MgO4(H2O)(2) polyhedra and PO4 tetrahedra, forming two-dimensional intersecting 8-ring channels. Their frameworks exhibit distinct 4-connected zeolite-like topologies, as well as different dehydration behaviours during the calcinations. Their structure correlation has been discussed through the different linkage modes of Mg2Al3P5O30 building units. This work will provide insight into the synthesis and design of the novel MAPO (M = metal) molecular sieves.