Second Concept in Catalyst Design. One-Pot Synthesis of Fe Zeolite Catalysts

It was first assumed that the oxidant was H2O2. However, since traces of Fe-cations are present, a Fenton s type oxidation pathway, based on OH radicals, is more likely taking place. 

Second Concept in Catalyst Design. One-Pot Synthesis of Fe Zeolite Catalysts 

We discuss here a combined process including detemplation and Fe incorporation by ion-exchange in the zeolite framework [147]. To achieve this, oxidants to decompose the organic template and Fe-cations for exchange are needed. Both requirements are in harmony with Fenton chemistry. The OH radicals can oxidize the template and the Fe-cations be exchanged simultaneously. 

The preparation was performed on a commercial microcrystalline beta zeolite. The zeolite was treated with the Fenton s reagent and less than 0.3 wt% of carbon remained after the treatment. The porosity was fully developed as revealed by the pore-size distribution. Elemental analysis combined with TPR did confirm the high degree of Fe-exchange (98%) on the Bronsted sites. 

Contacting the synthesized zeoHte with the reagent leads to a ready-to-use catalyst. No further pretreatment before reaction is needed. The performance of such a novel one-pot catalyst was tested in N2O decomposition, and was found to be even superior to the conventionally prepared counterpart This was ascribed to the minimization of FeO,c formation. 

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