Organic-Inorganic Hybrid Zeolites Containing Organic Frameworks

Abstract

Organic-inorganic hybrid zeolite materials containing an organic framework have been synthesized by partially superseding a lattice oxygen atom by a methylene group. The use of methylene-bridged organosilane as a silicon source gives zeolite materials containing an organic group as lattice (ZOL), with several zeolitic phases such as the MFI and the LTA structures. Through various characterization methods, the presence of methylene frameworks (Si-CH2-Si) that replace siloxane bonds (Si-O-Si) has been verified, although the Si-C bonds are partly cleaved to give rise to terminal methyl groups. The shape-selective lipophilicity of a ZOL material indicates that it is not a physical mixture of conventional zeolite and amorphous organic-containing material but contains a genuine organic-inorganic hybrid zeolite.

The Leading Role of Association in Framework Modification of Highly Siliceous Zeolites with Adsorbed Methylamine

“…For instance, Yamamoto et al have hydrothermally synthesized the CH 2 -hybrid LTA-, MFI-, and BEA-type zeolites with bis(triethoxysilyl)methane, in which a CH 2 group bridges two Si atoms, by using tetrapropylammonium and tetraethylammonium ions as the structure-directing agent. [2] The disadvantage of this synthesis is the high cost. Another potential method is post-synthesis by modifying a raw zeolite.…”

“…[1] Recently, a novel hybrid MFI-type zeolite has been obtained through replacing the framework bridging oxygen atoms by CH 2 groups. [2] Theoretical calculations indicate that it is energetically possible that zeolites can accommodate both methylene and amine groups. [3] Moreover, the incorporation of NH groups in zeolites may increase the Lewis basicity of the materials.…”

Hierarchical Nanostructures: Design for Sustainable Water Splitting

“…[152] Most of the transition metal cations can be used to form MOFs-based nanostructures by using appropriate organic ligands under mild conditions. [153][154][155] Therefore, MOFs have been recently developed as versatile precursors for the synthesis of highly porous transition metal based nanomaterials for electrocatalytic applications. [156][157][158] As there have been many excellent review articles regarding the synthesis of various MOFs, [159][160][161][162][163] in this section, we step straightforward to the processing strategies of designing hierarchically structured electrocatalysts using well-defined MOF precursors.…”

Direct Synthesis of Functional Zeolitic Materials

“…A remarkable achievement was the synthesis of hybrid silicoaluminates containing small organic groups in the zeolite framework reported by Yamamoto et al [85]. They [80].…”