Abstract Preparation methods were developed for introducing different O–or halide-containing metal moieties into zeolitic frameworks. The transformation of Brönsted acidity to Lewis acidity by the reaction deserves special attention from the point of view of catalytic cracking, as no oxygen vacancies are produced simultaneously (see Jacobs and Beyer ). The halide ion-containing metal moieties exhibit noteworthy activity in cyclopropane isomerization. The specimens treated with SnCl4 are hyperactive in this reaction, revealing that allyl cations may be the active centres of the transformation. At elevated temperatures dealumination takes place; this does not necessarily lead to complete structural collapse if special care is taken.
ASJC Scopus subject areas
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry