The aluminosilicates or zeolites useful in the present invention may be generally designated by the chemical formula M2/n O.Al2 O3.ySiO2.wH2 O in which M is a charge balancing cation, n is the valence of M and is 1 or 2, y is the number of moles of SiO2 and is 1.8 to 15, and w is the number of moles of water of hydration per molecule of the aluminosilicate.