Studies on mesoporous niobosilicates synthesized using F127 triblock copolymer

Abstract

A detailed characterization of cage-like mesoporous SBA-16 niobosilicate with tailored features of the structure is reported. The materials were synthesized in a EO 106 PO 70 EO 106 (F127)-water system under acidic conditions and the pore diameters were tuned by varying the hydrothermal treatment temperature and time. The effects of the synthesis parameters on the structural/textural properties of the cubic Im3m niobosilicates have been investigated systematically. We show that the total pore volume, pore diameter, and micro-/mesopores ratio can be controlled very efficiently by changing the synthesis parameters.

Toward Exploiting the Behavior of Niobium-Containing Mesoporous Silicates vs. Polyoxometalates in Catalysis

“…Different types of mesoporous materials containing niobium have been prepared and tested in oxidation reactions with H 2 O 2 (Nowak et al, 2003 ; Nowak and Ziolek, 2005 ; Somma and Strukul, 2006 ; Feliczak-Guzik et al, 2009 ; Gallo et al, 2013 ; Tiozzo et al, 2014 ; Ivanchikova et al, 2015 , 2017 ; Ramanathan et al, 2015 ; Thornburg et al, 2015 ; Dworakowska et al, 2017 ; Thornburg and Notestein, 2017 ).…”

“…Nowak et al described the selective oxidation of terpenes and terpenoids, such as geraniol, limonene, α-terpineol using H 2 O 2 as an oxidant over NbMSU-X-catalysts (Feliczak-Guzik et al, 2009 ), which are characterized by a 3D interconnecting network of “worm-like” pores (Feliczak and Nowak, 2007 ). The oxidation of terpenes/terpenoids was performed in glass batch reactor upon dynamic stirring at 313 K for 23 h. Products of reaction were evaluated by GC and GC-MS.…”

“…There are several aspects that influence the synthesis of Nb-containing mesoporous molecular sieves, namely silicon and niobium source, their molar ratio, surfactant type, synthesis environment (pH, the presence of counterions), etc. General methodologies for the synthesis of niobium catalysts on mesoporous materials are based on the use of the hydrothermal method, e.g., Ziolek's and Nowak's groups described incorporation of niobium during the synthesis of mesoporous materials using hydrothermal method (Ziolek and Nowak, 1997 ; Kilos et al, 2004 ; Nowak and Jaroniec, 2005 ; Feliczak-Guzik et al, 2009 ; Nowak, 2012 ). An overall procedure for the synthesis of various mesoporous materials is shown in Figure 2 .…”

Sol Gel-Derived SBA-16 Mesoporous Material

“…Al-SBA-16, Ti-SBA-16, V-SBA-16, Fe-SBA-16 and Nb-SBA-16 mesoporous silicas with a cubic Im3m structure have been successfully synthesized using silica precursors and a triblock copolymer under acidic condition [44,75–80]. …”

“…It was found that pore volume, pore diameter, and micro-/mesopores ratio can be controlled very efficiently by changing the synthesis parameters [80]. …”