主权项 |
1. A zirconium silicate composition comprising zirconium silicate of formula (I):
ApMxZr1-xSinGeyOm (I) where
A is a potassium ion, sodium ion, rubidium ion, cesium ion, calcium ion, magnesium ion, hydronium ion or mixtures thereof,M is at least one framework metal, wherein the framework metal is hafnium (4+), tin (4+), niobium (5+), titanium (4+), cerium (4+), germanium (4+), praseodymium (4+), terbium (4+) or mixtures thereof,“p” has a value from about 1 to about 20,“x” has a value from 0 to less than 1,“n” has a value from about 0 to about 12,“y” has a value from 0 to about 12, “m” has a value from about 3 to about 36 and 1≦n+y≦12, wherein the composition comprises ZS-9 and ZS-7 and lacks detectable amounts of ZS-8. |