Fe-containing zeolite KL
AssigneeExxon Chemical Patents Inc.
InventorJohannes P. Verduijn
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Abstract
The crystal size and shape of zeolite KL can be improved by forming the zeolite from a synthesis mixture in which the molar ratio of K.sub.2 O/SiO.sub.2 is 0.18 to 0.36, and in which the synthesis mixture comprises iron preferably in an amount such that the molar ratio of Fe.sub.2 O.sub.3 /Al.sub.2 O.sub.3 is 0.015 to 0.3.
Claims23
An Fe-containing zeolite KL obtained by heating a synthesis mixture comprising a source of K.sub.2 O, a source of SiO.sub.2, a source of Al.sub.2 O.sub.3 and a source of Fe.sup.3+, in which the K.sub.2 O/SiO.sub.2 molar ratio is 0.18 to 0.36 and the Fe.sub.2 O.sub.3 /Al.sub.2 O.sub.3 molar ratio is such that the average length of the zeolite crystals produced is not more than 80% of the average length of zeolite crystals produced by heating under the same conditions the corresponding synthesis mixture in the absence of iron, said zeolite further characterized in that the Fe.sub.2 O.sub.3 /Al.sub.2 O.sub.3 molar ratio is at least 0.015 end up to 0.06 when the SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio in said synthesis mixture is less than 15 and the Fe.sub.2 O.sub.3 /Al.sub.2 O.sub.3 molar ratio is greater than 0.06 and up to 0.3 when the SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio in said synthesis mixture is at least 15.
A method of using a source Fe.sup.3+ to reduce the average crystal length of a zeolite comprising including the Fe.sup.3+ source in a synthesis mixture for the zeolite comprising a source of K.sub.2 O, a source of SiO.sub.2 and a source of Al.sub.2 O.sub.3, the K.sub.2 O/SiO.sub.2 molar ratio being 0.18 to 0.36 and the Fe.sub.2 O.sub.3 /Al.sub.2 O.sub.2 molar ratio being 0.015 to 0.3.
Dependencies are inferred from the claim text.