A low silica AFI zeolite and a high purity gmelinite zeolite that have a SiO.sub.2 /Al.sub.2 O.sub.3 ratio of about 10 or less are provided.

Se proporcionan una zeolita baja de la silicona AFI y una zeolita del gmelinite de la pureza elevada que tengan un cociente de SiO.sub.2 /Al.sub.2 O.sub.3 de cerca de 10 o menos.
 
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