Zinc phosphate molecular sieves and their use in adsorption and catalysis

摘要

Zinc phosphate molecular sieves are disclosed. These molecular sieves have a three-dimensional microporous framework structure of ZnO₂ and PO₂ tetrahedral units, an intracrystalline pore system and an empirical chemical composition on an anhydrous basis expressed as ratio of the oxides by the formula: rM₂O:sZnO:P₂O₅, where M is at least one alkali metal, r ranges from 0.9 to 1.5 and s ranges from 1.8 to 3.0. These molecular sieves are prepared by hydrothermal crystallization of a reaction mixture prepared by combining a reactive source of phosphorus, zinc, at least one alkali metal and water. Adsorption and hydrocarbon conversion processes using these molecular sieves are also disclosed.