Abstract
This chapter describes the interaction between copper (Cu) and niobium (Nb) in the mesoporous molecular sieves of MCM-41 type. It also discusses the results of the reaction between Cu and the extra framework Nb species. The results are compared with those found for copper-containing alumino-silica sieves (AlMCM-41). Cu cations in NbMCM-41 matrix are slightly reduced during heating at 723 K under a low vacuum and deeply under a high vacuum, whereas in AlMCM-41, copper is partially reduced to cuprous ion (Cu + ) under a high vacuum. The strong interaction of Cu species with Nb, introduced into the framework of the molecular sieves, determines the catalytic properties of the materials.
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