Preparation of zeolite X with low levels of iron impurity from reaction mixtures containing triethanolamine

Eric N. Coker, Robert W. Thompson, Anthony G. Dixon, Albert Sacco, Sang S. Nam, Steven L. Suib

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Virtually iron-free zeolite X can be prepared using readily available raw materials and normal laboratory techniques by the addition of 2,2′,2″-nitrilotriethanol (triethanolamine, TEA) to the reaction mixture prior to crystallization. The TEA chelates to Fe3+ in solution to reduce the quantity of iron which is incorporated in the a luminosilicate framework. Experiments have been performed in which controlled quantities of iron(III) sulfate were added to the fresh reaction mixture in order to verify this assertion. Samples which were prepared in the absence of TEA generally contained more than three times as much iron as did those prepared with TEA. The electron paramagnetic resonance (EPR) spectrum of a sample prepared from a mixture to which no iron was intentionally added, and which contained TEA, showed that the zeolite was effectively iron-free. The corresponding sample prepared without TEA gave strong EPR signals for octahedral Fe2O3 clusters and tetrahedral (framework substituted) iron.

Original languageEnglish
Pages (from-to)6465-6469
Number of pages5
JournalJournal of physical chemistry
Issue number24
StatePublished - 1993


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