Layered precursors for new zeolitic materials: Synthesis and characterization of B-RUB-39 and its condensation product B-RUB-41

Condensation of layered silicate precursors leads to new, all silica zeolite frameworks. In order to introduce catalytic functionality, boron has been substituted into the silicate layer of RUB-39 in a single step synthesis process. Condensation of the silicate layer to the zeolite framework of RUB-41, RRO framework structure type, preserved B as constituent of the material. Analysis of structural details obtained from Rietveld analysis of powder diffraction data, 11B and 29Si NMR experiments of the as synthesized precursor as well as of the zeolite condensation product, and crystal chemical reasoning indicates segregation of B on one specific T-site. This T-site is buried in the silicate anionic layer of the precursor shielding the additional negative charge introduced by the trivalent T-atom.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Substitution of Si by 3-valent T-atoms in layered silicate precursors leads to functional zeolites. ► We demonstrate B-substitution in the layered silicate precursor RUB-39. ► Functionalization was achieved in a single step reaction. ► The condensation product is zeolite B-RUB-41 (RRO framework type). ► Experimental evidence is provided for B-order on T-sites.