Preparation and characterisation of MCM‐41 materials with intra‐wall cross‐mesopores

Abstract

A series of novel mesoporous MCM-41 (Mobil Composition of Matter No. 41) materials has been synthesised using pre-organo-functionalised fumed silica as the silica source. Subsequent X-ray diffraction, nitrogen/argon adsorption and transmission electron microscopy analyses indicated that the additional mesopores formed in silica walls seem to cross the inherent hexagonally arranged channels, affording interconnected structural mesopores. Compared with the conventional MCM-41 material featuring single cylindrical pores, the newly prepared materials have a larger surface area (1450 m 2 /g), and their adsorption capacity for n-heptane has been enhanced in the low-pressure region, which presumably would be highly beneficial to the abatement of low-concentration volatile organic compounds.

Review on Porosity Control in Nanostructured Semiconducting Metal Oxides and Its Influence on Chemiresistive Gas Sensing

“…For instance, the SBA-15 template consists of tunable ordered mesopores and thickness of pore walls in the range of 4−30 and 0.3−4 nm, respectively, 219 whereas for the MCM-41 template, the porosity falls in the range of 1.4−10 nm, and it is characterized with interconnected wall mesopores. 220 Based on these features, the templates have been utilized for the synthesis of SMOs with enhanced gas sensing performance. Lai et al employed a KIT-6 template to synthesize ordered mesoporous NiFe 2 O 4 with a 5 nm thin framework and a specific surface area of 216 m 2 •g −1 .…”

“…The achievable degree of porosity depends on the pore size and wall thickness of the templates. For instance, the SBA-15 template consists of tunable ordered mesopores and thickness of pore walls in the range of 4–30 and 0.3–4 nm, respectively, whereas for the MCM-41 template, the porosity falls in the range of 1.4–10 nm, and it is characterized with interconnected wall mesopores . Based on these features, the templates have been utilized for the synthesis of SMOs with enhanced gas sensing performance.…”

Effect of Poly(vinyl alcohol) Concentration on the Micro/Mesopore Structure of SBA15 Silica

“…Nanoporous silica with a 2-50 nanometers pore diameter is a porous material that consists of regularly arranged pores [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. It has been prevalently employed in catalyst supports, drug delivery carriers, adsorbents, sensors, and fuel cells, owing to its high specific surface area, uniform pore structure, narrow pore size distribution, and potential ability to inhibit active particle growth and aggregation in its pores [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. In addition, porous materials such as zeolite and MOFs have been researched, and mesoporous silica has many advantages which enable it to be used in various applications, such as high diffusivity using relatively large mesopores and high thermal/chemical stability .…”

“…Several types of mesoporous materials (e.g., SBA, MCM, KIT, etc.) have been manufactured by modifying the synthesis pathway and surfactants [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]20,21]. Due to its thick pore wall and relatively high hydrothermal stability, SBA15 has received the most attention among these mesoporous materials, and various techniques have also been used to further increase its hydrothermal stability [1][2][3][4][5].…”

“…The characteristics relevant to the aforementioned applications are the pore geometry, diameter, size distribution, volume, and BET surface area. Numerous research groups have tailored the pore structure of mesoporous materials to optimize their properties [1,[5][6][7][8][9][10][11][13][14][15]17,[24][25][26][27][28]. To enhance the applicability of these materials, it is necessary to increase their pore volume and BET surface area.…”