Verified syntheses of mesoporous materials

The dynamic adsorption/desorption behavior of volatile organic compounds (VOCs) such as toluene (C7H8) and benzene (C6H6) was evaluated for three kinds of mesoporous silicas of SBA-15, all having almost the same mesopore size of ca. 5.7 nm, and a MCM-41 silica with a smaller pore size of 2.1 nm using a continuous three-step test. The fiberlike SBA-15 silica exhibited exceptionally good breakthrough behavior, a higher VOC capacity, and easier desorption. The fiberlike silica was composed through the catenation of rodlike particles. The rodlike silicas, by comparison, were proven to be less useful in dynamic adsorption processes because of lower dynamic VOC capacities despite having comparative porous parameters with the fiberlike silica. The large dynamic VOC capacity of the fiberlike silica was attributed to the presence of a bimodal pore system consisting of longer, one-dimensional mesopore channels connected by complementary micropores.

Effect of pore structure in mesoporous silicas on VOC dynamic adsorption/desorption performance.

Mesoporous materials as multifunctional tools in biosciences: principles and applications.

Mesoporous silicas (MCM-48, SBA-15, MCF), reflecting various porous structures, were modified with copper and iron oxides by two different methods. For a first series of the samples the molecular designed dispersion (MDD) method using acetylacetonate complexes of copper and iron was applied for the deposition of transition metal oxides on the silica supports. A second series of the catalysts was obtained by the incipient impregnation technique using aqueous solutions of the suitable metal nitrates. The modified materials were characterized with respect to the texture (BET), composition (electron microprobe analysis), coordination of the transition metals (UV–vis–DRS) and surface acidity (NH3-TPD, FTIR). The mesoporous silica supports modified with transition metal oxides were tested as catalysts of the selective reduction of NO with ammonia. The catalytic performance of the studied samples depended on the method used for the deposition of transition metal oxide as well as the kind of mesoporous silica used as a catalytic support. In general, the Cu-containing mesoporous samples effectively operated at lower temperatures than silicas modified with iron. The samples obtained by the MDD method have been found to be more active and selective compared to the analogous samples prepared by the impregnation technique. An introduction of water vapor into the reaction mixture only slightly decreased the NO conversion and selectivity towards N2 over the MCF mesoporous silica modified with copper or iron oxide.

Catalytic performance of various mesoporous silicas modified with copper or iron oxides introduced by different ways in the selective reduction of NO by ammonia

Synthesis of siliceous materials with micro- and mesoporosity

Hexagonal mesoporous silica materials (PHTS) are synthesized with a high TEOS/EO20PO70EO20 ratio containing microporous nanocapsules or plugs inside the mesoporous channels. This PHTS material exhibits a tunable amount of open and plugged pores, has a high micropore volume (up to 0.24 mL/g), and is more stable than conventional micellar templated structures known so far. This study focuses on a thourough investigation of the influence of the amount of TEOS, the stirring temperature, the aging temperature, and the stirring time on the material characteristics using N2 sorption, X-ray diffraction, and scanning electron microscopy. PHTS materials with different amounts of TEOS were synthesized at stirring temperatures between 60 and 100 °C. At 60 °C, materials synthesized with a molar ratio TEOS/P123 of 125 proved to have a more rigid silicate framework than materials synthesized with lower amounts of TEOS resulting in PHTSs with a smaller diameter. The amount of TEOS and the stirring temperatures proved to ...

Plugged Hexagonal Templated Silica (PHTS): An In-Depth Study of the Structural Characteristics

Plugged hexagonal templated silica (PHTS) materials are synthesized using a high TEOS/EO20PO70EO20 ratio in the SBA-15 synthesis. This generates internal microporous nanocapsules or plugs in part of the channels, which could be inferred from the two-step desorption branch. These materials exhibit a tunable amount of open and plugged pores and a very high micropore volume (up to 0.24 mL/g) and are more stable than the conventional micellar templated structures known so far. In this study the adsorption properties of PHTS are investigated and compared to those of its plug-free analogue SBA-15. For this purpose nitrogen, n-hexane, n-heptane, c-hexane, 3-methylpentane, 1-hexene, and water were adsorbed on SBA-15 and PHTSs with a different ratio of open and plugged mesopores. The adsorption of n-hexane, c-hexane, n-heptane, and 3-methylpentane on SBA-15 and PHTS-A demonstrated that the presence of the plugs had an effect on the uptake of adsorbate in the low relative pressure region, the position of the capill...

Adsorption of hydrocarbons on mesoporous SBA-15 and PHTS materials.

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Plugged Hexagonal Templated Silica (PHTS): An In-Depth Study of the Structural Characteristics

Adsorption of hydrocarbons on mesoporous SBA-15 and PHTS materials.