Mesoporous silica molecular sieve

Synthesis of mesoporous silica molecular sieves via a novel templating scheme... 

XRD patterns of the sample prepared mesoporous silica molecular sieves. 

Figure 2. XRD patterns of as-synthesized LZC mesoporous silica molecular sieves with different pH. (A) 2, (B) 7. (C) 10...

Properties of LZC mesoporous silica molecular sieves with different aging time... 

Figure 5. Nj adsorption/desorption isotherms of calcined LZC mesoporous silica molecular sieves with different surfactant/SiOj (A) 0.1, (B) 0.2. (C) 0.5, (D) 1.0, and (E) 1.5...

Chromium-containing mesoporous silica molecular sieves (Cr-HMS) with tetrahedrally coordinated isolated chromium oxide (chromate) moieties can operate as efficient photocatalysts for the decomposition of NO and the partial oxidation of propane with molecular oxygen under visible light irradiation (Yamashita et al., 2001). 

POSTSYNTHESIS HYDROTHERMAL TREATMENT OF DOUBLE-MESOPORE SILICA MOLECULAR SIEVES IN WATER... 

Two mesoporous silica molecular sieves synthesized by using n-octadecyl-ammonium bromide and n-dodecylammonium bromide as a templates were characterized for their pore size distribution by temperature programmed desorption method and low temperature nitrogen adsorption method. The pore size distributions and total pore volumes determined by the two methods agree quite well and are within experimental error. 

P.T. Tanev and T.J. Pinnavaia, Mesoporous Silica Molecular Sieves Prepared by Ionic and Neutral Surfactant Templating A Comparison of Physical Properties. Chem. Mater., 1996, 8, 2068-2079. 

Tanev, P.T. Pinnavaia, T.J. Mesoporous silica molecular sieves prepared by ionic and neutral surfactant templating a comparison of physical properties. Chem. Mater. 1996, 8 (8), 2068-2079. 

Thiol-functionalised mesoporous silica molecular sieve HMS-SH was synthesized at room temperature from a gel containing 0.8 mol tetraethoxysilane (TEOS), 0.2 mol 3-mercaptopropyltrimethoxysilane (MPTS), 0.275 mol n-dodecylamine, 8.9 mol ethanol and... 

Several methods can be relied on to adjust the pore sizes of mesoporous silica molecular sieves, as mentioned above, such as the selection of surfactants, hydrothermal treatment, and organic additives. Table 13.1 illustrates the pore... 

Metal-Substituted Mesoporous Silica Molecular Sieves I 287... 

Indeed, the compositional flexibility of mesoporous materials is such that it is possible to prepare mesoporous organosilicas with organic groups (e.g., ethene) inside the pore walls. An unusual property of mesoporous silicas is that they can themselves be used as templates for the formation of mesoporous carbon. The mesoscopi-cally ordered nanoporous (or mesoporous) carbon molecular sieves are prepared by carbonizing sucrose (or other carbon precursors) inside the pores of mesoporous silica molecular sieve. The mesoporous carbon is obtained after subsequent removal of the silica template by dissolution in HF (hydrofluoric acid) or NaOH (sodium hydroxide) solution. 

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