Abstract
A combination of hard-templating (HT) and soft-templating (ST) approaches was studied to obtain MWW-type materials with intermediate physicochemical properties. The HT methodology involved the introduction of carbon particles as hard templates during gel synthesis to obtain a layered zeolitic precursor (LZP) with particles possessing a microspherical morphology. The LZP obtained was treated with surfactants as soft templates to expand the layers of the LZP, followed by a pillaring procedure. The materials were characterized by X-ray diffraction, transmission and scanning electron microscopy, elemental analysis and N2 adsorption. The results demonstrate that the obtained material possesses intermediate properties from both approaches, with interparticle mesopores/macropores and pore sizes between 18 and 46 Å. However, the ST procedure causes a partial disruption of some microspheres, forming small crystallite aggregates, and results in a decrease in the number of interparticle mesopores/macropores previously formed by the HT method.
Highlights
Introduction100 nm; they can be used in a wide range of applications [1]
Nanoporous materials are solids with porous features with molecular dimensions of around100 nm; they can be used in a wide range of applications [1]
The material obtained after the synthesis of layered zeolitic precursor (LZP) using carbon black pearl as a hard template was labelled MWW(P)HT
Summary
100 nm; they can be used in a wide range of applications [1] Within this class, zeolites are fascinating microporous crystalline materials that have been applied in different fields, especially in catalysis, adsorption, separation and fuel-cell technology [2,3]. Zeolites are fascinating microporous crystalline materials that have been applied in different fields, especially in catalysis, adsorption, separation and fuel-cell technology [2,3] These materials are built from SiO4 and AlO4 −. Tetrahedra (or other elements) that connect to each other via oxygen bridges [4] Repetitive connections of these basic units form three-dimensional structures with large internal volumes due to the presence of uni-, bi- or tridimensional channel systems (interconnected or not) and cavities with molecular dimensions of up to 2 nm (microporous range) [5]. According to the International Zeolite Association (IZA), 248 different framework topologies have been reported so far [6]
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