Patent ID: 6379641
Filing Date: 2002-04-30
Classification: C01B

Abstract:
A crystalline microporous composition having a three dimensional framework structure of at least silicon tetrahedral oxide units and at least one M oxide unit and having an empirical formula on an anhydrous basis of:An(M1âˆ’zMâ€²z)wSi1âˆ’yGeyOx where A is a cation selected from the group consisting of alkali metals, alkaline earth metals, hydronium ion and mixtures thereof, â€œnâ€  is the mole fraction of A and varies from about 0.5 w to about 4 w, M is at least one element selected from the group of rare earth elements, except when â€œzâ€  is zero, M is not neodymium or yttrium, â€œzâ€  is the mole fraction of Mâ€² and varies from 0 to about 0.99, Mâ€² is a metal having a valence of +2, +3, +4 or +5, â€œwâ€  is the mole fraction of the sum of M and Mâ€² and varies from about 0.1 to about 0.5, â€œyâ€  is the mole fraction of germanium and varies from 0 to about 0.99 and â€œxâ€  has a value such that it satisfies the valence of the framework elements.