Shape‐Selective Catalysis with Microporous Amorphous Mixed Oxides

Ti‐ and V‐containing amorphous glasses with inner surfaces of several hundred m2g−1 and pore diameters of 0.7 nm can be prepared by a sol‐gel process. Like zeolites, these amorphous microporous mixed oxides AMM‐MxSi show catalytic shape‐selectivites. The epoxidation of alkenes with tert‐butylhydroperoxide on Ti‐containing glasses is catalyzed size‐selectively. In the hydrocracking test of decane, these materials show a product distribution that indicates the presence of Brønstedt centers in a shape‐selective environment, as well as tubular pores, the lack of additional cavities, and an effective pore size comparable to those of 10‐ and 12‐ring zeolites.