Nonsurfactant route of fatty alcohols decomposition for templating of mesoporous silica

Using the Response Surface Methodology to Optimize the Extraction of Silica and Alumina from Coal Fly Ash for the Synthesis of Zeolite Na-A

“…Recently, microwave-assisted thermal fusion of CFA and sodium hydroxide resulting in sodium silicate has been reported [6]. Generally sodium silicate is an important ingredient and the source of soluble silica for the preparation of zeolites [4,5,[7][8][9][10] and mesoporous materials [11,12], which are expected to be high-value industrial materials. Zeolites have wide applications amongst which are included adsorbents, reaction catalysts, catalyst support and filtering agents [13][14][15][16][17][18].…”

Facile Preparation and Characterizations of Potential Low-Cost Nanostructured Materials for Energy Gas Storage

“…The corresponding pore size distribution estimated by the Dollimore-Heal method was at ca. 4 nm which was higher than usually observed for framework pore sizes but lower than those obtained by textural pore sizes [18]. This value suggested that the mesoporous structure originated from agglomerations of smaller nanocrystalline particles that resulted in the formation of textural mesoporosity [18].…”

“…However, it was suggested that the condensation of hydrolyzed aluminum species did not occur on the surface of template (surfactant or fatty alcohol) aggregates [18]. Thus, the template aggregates simply acted as the reservoir to supply the fatty alcohols for the template/hydrolyzed aluminum complexes forming bigger agglomerations as the template/hydrolyzed aluminum complexes began to grow as the hydrolysis and co-condensation proceeded during the synthesis [18]. When the complexes had grown large enough, they will precipitate out from the solution.…”

One-pot synthesis of hybrid mesoporous xerogels starting with linear polymethylhydrosiloxane and bridged bis-(trimethoxysilyl)ethane

“…The characteristics observed are typical of porous structures with large surface areas and pore volumes as those materials obtained through traditional templates [37]. More importantly, corresponding to the analysis results of pore size distributions, the specific surface areas of those hybrid materials prepared in the presence of PMHS are higher than the one prepared only with BTME as precursor; it thus demonstrates that, utilizing the transformable Si-H bonds under employed synthesis conditions, linear PMHS molecules can condense with BTME monomers and in-turn change the microstructure of as-prepared hybrid materials (Plausible transformation process of PMHS is illustrated in Fig.…”

“…As a widely used organosilica precursor for the preparation of porous hybrids [8,9], BTME monomer, which has small bridging groups, does not possess any structuredirecting function for forming porous hybrids with relatively uniform diameters [36][37][38][39]. From the simple reagents used in the synthesis (BTME, PMHS, C 2 H 5 OH, H 2 O, and NaOH) and the results of detailed characterization techniques, it is thus proposed that linear PMHS polymers with transformable -SiH groups are both partly silicon sources and crucial pore porogens for hybrid networks in the present sol-gel process [35][36][37][38][39].…”