Synthèse critique de la caractérisation électrochimique de zéolithes et d'aluminophosphates chimiquement modifiés

Abstract

Zeolites that have been chemically modified by incorporating transition metal complexes in their porous network and molecular sieves chemically modified by incorporating transition metal in their framework have led to numerous applications of which the most widespread is undoubtfully catalysis. However, the catalytic activity of these inorganic compounds is still not well understood and there is a lack of evidence concerning the encapsulation efficiency of complexes within the zeolites and the location of transition metals inside the framework of molecular sieves. Numerous studies have shown that zeolite encapsulation has an influence on the redox behaviour of these complexes, such as in preventing aggregation or the dimerization process. Moreover, analysis of the electrochemical process at this type of modified electrode demonstrates solvant and electrolyte effects on the electroactivity of the encapsulated complexes. However, these different studies highlighted the unsatisfactory electrochemical accessibility of intrazeolitic or framework species. Thus, we undertake here a discussion of the different strategies reported in the literature aimed at promoting the electroactivity of these molecular materials.