Stabilization of Mesoporous Molecular Sieves by Trimethylsilylation

Abstract

The stability of Si-MCM-48 to moisture and compression can be improved by trimethylsilylation, as a result of the increase in hydrophobicity. Moreover, the stability is retained after calcination, although the calcined material is no longer hydrophobic. This stabilizing effect was also observed for Si-MCM-41 and Ti-MCM-41.

Enhancement of Gaseous BTEX Adsorption on RH-MCM-41 by Chlorosilanes

“…To resolve this drawback, the surface modification via silylation has been introduced. Generally, the silylation is a well-known technique for surface tailoring on several materials containing silanol groups such as MCM-41, MCM-48, SBA-1 and silica gels (Deschner et al 2010;Koyano et al 1997;Lin et al 2008;Yokoi et al 2004;Yuan et al 2006;Zhao & Lu 1998). The common reagents used for the silylation are organosilanes.…”

Post-synthesis of Thick Wall Mesoporous Silica with Wormhole Framework Structure Using Surfactant Micelles and Silica Source Incorporated Inside the Channels of Silica Precursor with Large-mesopores

“…Under such conditions, structure of mesoporous silica materials MCM-41 was sometimes deteriorated or collapsed due to hydrolysis of Si-OSi bonds of thin pore walls. Much effort has been directed toward improving the structural and hydrothermal stability of MCM-41 materials, including post-synthesis grafting of organosilane to the surface of the silica walls [1], thickening the pore walls [2], and making a better and more uniform local order in terms of the degree of polymerization of silica species by fine tuning of synthetic parameters such as pH, additives (e.g., salts, alkylamines etc. ), the concentrations, the silica source, and temperature etc.…”

Adsorption and Desorption Dynamics of Sodium Dodecyl Sulfate at the Octadecylsilane Layer on the Pore Surface of a Mesoporous Silica Film Observed in-situ by Optical Waveguide Spectroscopy

“…Such techniques include co-condensation of silica, addition of secondary metal oxides, and surface modification. [22][23][24][25] The ODS layer of ODS-MS can also work to suppress the silica hydrolysis. The effect of the structural and optical properties of the ODS-MS layer on the excitation of the OWG mode was examined by forming ODS-MS on a thin aluminum (Al) layer, and the features of OWG spectroscopy of the ODS-MS/Al multilayer film were examined by observing the adsorption/desorption dynamics of SDS.…”