Abstract
The catalytic behavior in p-xylene oxidation to para-tolualdehyde and terephthaloaldehyde and in 3-fluorotoluene oxidation to 3-fluorobenzaldehyde over bulk iron-molybdate and iron–molybdenum oxides encaged in zeolitic matrices was studied. The results indicate that site isolation of the iron-molybdate inside the zeolite matrix allows a relevant improvement in selectivity, but the nanosized particles also show particular properties not present in the bulk iron-molybdate such as the ability to selectively form the dialdehyde (terephthaloaldehyde) from p-xylene. At low temperatures the productivity of iron–molybdenum-containing zeolites is comparable to that of bulk iron-molybdate, even though the amount of active component is one order of magnitude lower. However, at higher temperatures limitations regarding the back-diffusion of products result in lower activity and selectivity.
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Centi, G., Perathoner, S. Site isolation in iron-molybdate-based catalysts for side chain oxidation of alkylaromatics. Topics in Catalysis 15, 145–152 (2001). https://doi.org/10.1023/A:1016658000931
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DOI: https://doi.org/10.1023/A:1016658000931