Layered precursors for new zeolitic materials: Synthesis and characterization of B-RUB-39 and its condensation product B-RUB-41
Grünewald-Lüke, Antje × Gies, Hermann Müller, Ulrich Yilmaz, Bilge Imai, H Tatsumi, Takashi Xie, B Xiao, Feng-Shou Bao, Xinhe Zhang, Weiping De Vos, Dirk #
Microporous and Mesoporous Materials vol:147 issue:1 pages:102-109
Condensation of layered silicate precursors leads to new, all silica zeolite frameworks. In order to introducé 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.