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2 Polish Journal of Chemistry

2 1998

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A contribution to ZSM-5 zeolite modified with niobia

100%

Romotowski T. , Komorek J. , Terskikh V. V.

tom Vol. 72, nr 12

2564-2572

ZMS-5 zeolite modified with Nb was investigated by XRD, IR and MAS NMR spectroscopies. Niobium atoms were introduced by calcination of NH4ZSM-5 zeolite with Nb2O5. The last samples showed Broensted and Lewis acidity and can catalyse m-xylene ammoxidation to nitriles. Thermal treatment of ZSM-5 and Nb2O5 decreases the amount of aluminium atoms eliminated from the lattice and preserves the framework.

ZSM-5 zeolite modified with thallium ions

100%

Romotowski T. , Komorek J. , Stoch J. , Mikołajczyk M.

tom Vol. 72, nr 11

2450-2454

ZSM-5 zeolite modified with Tl has been investigated with XRD, IR and XPS spectroscopies. Thallium Tl(+) ions were introducted in the exchange reaction in water medium, accompanied by exchange of Na(+) with H(+). From XPS results follows that more likely thallium atoms have been incorporated to the ZSM-5 zeolite lacctice as Tl(+) species. All TlHNa-ZSM-5 zeolite samples catalyzed ammoxidation of m-xylene. X-ray diffractograms before and after ammoxidation proved the preservation of the ZSM-5 zeolite structure.