Synthesis of Boron-containing CDS-1 Zeolite by Topotactic Dehydration–Condensation of [B]-PLS-1 Prepared from Layered Silicate H-LDS

Abstract

Boron-containing CDS-1 zeolite with CDO topology can be obtained from the layered borosilicate PLS-1 which was prepared from layered silicate H-LDS by dry-gel conversion. Pure crystals of [B]-PLS-1 can be formed in the range of Si/B ratio from ∞ to 280.

Synthesis of Gallosilicate Type Molecular Sieve with CDO Topology and Application to Solid Acid Catalyst

“…Former two Q 3 peaks are attributed to the HOSi(OSi)3 and the tetrahedrally coordinated silicon which is substituted by more than one Ga 3 (HOSi(OSi)3-n(OGa)n, n 1 to 3). These Q 3 peaks can be often found in the metal substituted layered silicate PLS-1 analogues 25) . …”

“…Zeolitic [Ga]PLS-1 In order to obtain the layered precursor of [Ga]PLS-1 from the gel containing H-kanemite, Ga2O3, NaOH, TMAOH and H2O, we have screened the appropriate gel compositions according to our recent procedure 25) and have optimized the molar ratios and reaction conditions for synthesizing [Ga]PLS-1 crystal as follows; 1.0 Si : x Ga : 5x NaOH : 0.2 TMAOH : 5.0 H2O, 170 for 3 days.…”

“…However, a variety of the CDS-1 zeolite with respect to chemical components of its framework has not been satisfied yet. Our group has reported the synthesis of the boron-containing CDS-1 zeolite 25) and Al _ CDS-1 zeolite has introduced by Sano et al 26) . Here we wish to report the synthesis and characterization of the gallosilicate type CDS-1 zeolite ([Ga] CDS-1) and its zeolitic layered precursor [Ga]PLS-1, and also applied for the solid acid catalyst such as cracking and MTO reactions.…”

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

“…5 and 6). Together with 11 B-NMR experiments, 1 H-, 13 C-(not shown), and 29 Siexperiments were also carried out, all confirming that the as synthesized layered precursor is structurally intact with the dimethyldipropylammonium cation as SDA and low field shifted protons (at ca. 17 ppm) indicative for the typical strong hydrogen bonding between the silicate layers, as has been analyzed for all silica RUB-39 already [16].…”

“…The authors report the incorporation of Al in the layered precursor for CDS-type zeolites, however, after condensation the pore volume was very low and the Si/Al was very high (>80) [12], limiting potential industrial applications. Very recently, Komura et al reported the substitution of Si by B in CODtype materials, also using a crystalline layered precursor material, HLS-1 or H-kanemite, as silica source reaching Si/B-ratios from infinity to 280 [13]. In this contribution we report our investigations on the substitution of T-sites with active centers in a direct, single-step reaction of a new type of layered precursor, RUB-39.…”