Abstract
An H-ZSM-5 zeolite (Si/Al = 12) was treated with solutions of tartaric acid, citric acid and EDTA. The impact of this treatment on the durability in the conversion of ethanol was investigated and correlated with the extraction of small amounts of aluminium. M06-L/6-31G(d) was applied as level of theory for the quantum chemical part of this work. These investigations showed that all EFSPE can be regarded as solvable and hence also as removable. By solid state characterisations (NMR, IR, XRD) no changes in the bulk properties were observed, although catalytic testings of the treated samples showed significant durability improvements. This ostensible contradiction can be explained by a changed ethene supply to the hydrocarbon pool after the removal of EFSPE acting as active sites which catalyse only dehydration reactions.
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