Synthesis of highly ordered mesoporous materials from a layered polysilicate

Abstract

The ion exchange reaction of interlayer Naf ions of a layered polysilicate kanemite with alkyltrimethylammonium ions, followed by calcination, gives highly ordered mesoporous materials with a hexagonal array of uniform channels.

Effect of the template ion exchange behaviors of chromium into FSM-16 on the oxidative dehydrogenation of isobutane

“…2(a)] matched the three diffraction peaks due to the hexagonal structure of FSM-16; those peaks were assigned to (100), (110) and (200) planes from the lowest diffraction angles. 8) Three peaks at approximately 22 degrees could be ascribed to tridymite (JCPDS 421401) as reported by Ikeue et al 13) Kanemite, which is finally converted to FSM-16, is produced through ¤-Na 2 Si 2 O 5 . 9) To synthesize pure kanemite, Na/Si molar ratio of the precursor should be kept at 1.0 during the synthesis while the control of the calcination temperature of the sodium silicate powder is important for the formation of pure ¤-Na 2 Si 2 O 5 .…”

“…For example, the greater surface areas such as 815 1078 m 2 /g supplied by Toyota Central R & D labs, Inc. (Lot no. NG78-550), 14) as well as 1070 and 1100 m 2 /g prepared by Inagaki et al 8) were reported. The samller surface area of FSM-16 prepared in the present study would indicate that it contains tridymite as impurities.…”

“…A hydrated sodium silicate powder (Kishida Chemical Co. Ltd., Osaka, Japan; a molar ratio of SiO 2 /Na 2 O = 2.00) as a silicate source and cetyl trimethyl ammonium bromide (Wako Pure Chemical Industries, Ltd., Osaka, Japan; (CTA)Br) as a template reagent were used for the preparation for FSM-16, according to a procedure established by Inagaki et al 8), 11) After the calcination of the hydrated sodium silicate powder at 973 K for 6 h, the resultant solid was ground, added to distilled water, and then stirred for 3 h at room temperature. During the stirring, the calcined solid converted to kanemite (NaHSi 2 O 5 ·3H 2 O).…”

Synthesis and electronic property of platinum nanowire and nanoparticle in mesoporous silica template

“…Siliceous FSM-16 [9] and organosilica HMM-1 with bridging -CH 2 CH 2 -groups [12,25] were prepared according to the literature methods (pore diameter 3 nm). In typical synthetic procedures, FSM-16 was dried under vacuum (ca.…”

“…Among various preparation techniques of nanowires and nanoparticles, the templates synthesis [6] is one of the promising methods, in which uniform void spaces of porous materials are used as a host to confine wires and particles as a guest [3,7]. Mesoporous silicas such as siliceous FSM-16 [8,9], MCM-41 [10], SBA-15 [11], and organosilica HMM-1 [12] have a two dimensional (2D) hexagonal structure (p6mm symmetry) of 1D-channels less than 10 nm in diameter and a high surface area up to 1000 m 2 g -1 . Therefore, the mesoporous silicas provide great opportunities as a template of nanostructured materials.…”