May 25, 2016

Publications

Delft Solids Solutions performs materials development in the field of combined micro- and mesoporous materials, aiming at zeolites in particular.
Zeolites are well-known in catalysis for their unique combination of properties like hydrothermal stability, intrinsic acidity and the opportunity to execute shape-selectivity. The purely microporous character however often induces intracrystalline transport limitations and accordingly the zeolite volume is not effectively used in most catalytic applications. Introduction of mesoporosity in the purely microporous matrix typically leads to an improved utilization of the zeolite volume and thus higher catalyst effectiveness.

Although several approaches can be used to arrive at combined micro- and mesoporous zeolites, in our research laboratory the desilication methodology is developed and further optimized to prepare mesoporous zeolites. Desilication is the controlled extraction of silicon from the zeolite framework, typically obtained in alkaline medium and enabling the preparation of different families of mesoporous zeolites (MFI, mordenite, beta).

This methodology has proven to be very effective in enhancing the catalyst performance for conversion of both bulky molecules in heavy gas oil as well as lighter hydrocarbons as propylene and ethylene. Besides, due to its simplicity and chemically controlled nature, this approach is easily scalable and amenable to practical implementation.

On request, Delft Solids Solutions can synthesize various combined micro- and mesoporous zeolites for small-scale testing; please contact us for more details.