COBALT PHOSPHATE BASED ZEOLITE STRUCTURES WITH THE EDINGTONITE FRAMEWORK TOPOLOGY

Hydrothermal syntheses and crystal structures of five zeolite edington ite analogues are presented. For the first time, the edingtonite frame work topology is assembled using an amine-assisted synthesis approach with either 1,2-diaminopropane or 1,2-diamino-2-methylpropane. These m aterials are created in the cobalt phosphate system with a small conce ntration of trivalent cations (Al3+ and Ga3+) incorporated into the fr amework for the host-guest charge matching. ACP-EDI1 and GCP-EDI1 are monoclinic, whereas ACP-EDI2, ACP-EDI3, and GCP-EDI2 are tetragonal (A CP = aluminum cobalt phosphate; GCP = gallium cobalt phosphate). The d ifference in lattice symmetries between ACP-EDI1 and ACP-EDI2 (or GCP- EDI1 and GCP-EDI2) is related to the synthesis conditions. All five st ructures have three-dimensional 8-ring channels along the crystallogra phic [001], [110], and [(1) over bar 10] directions, regardless of the difference in symmetry. Amine molecules are more ordered in the monoc linic phases than in the tetragonal phases, and the orientational diso rder of amine molecules persists at a temperature of 150 K.