Enhanced Brönsted acidity created upon Al-grafting of porous clay heterostructures via aluminium acetylacetonate adsorption

Ahenach, J.; Cool, Pegie; Vansant, Etienne F.

doi:10.1039/b006611g

Cited by 65 publications

(34 citation statements)

References 12 publications

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“…Typical BET surface area values for PCHs are about 500 -1100 m 2 /g and the total pore volumes are about 0.50 -1.00 cm 3 /g. [238][239][240] Moreover, in addition to the initial steps at very low pressure corresponding to adsorption in the micropores, there is considerable increase of the sorbate uptake in the p/p o range 0.02 -0.25, which indicates presence of small mesopores. Figure 14 illustrates difficulties in pore size analysis of micro-mesoporous materials like PCHs.…”

Section: Figure 13mentioning

confidence: 99%

Layer like porous materials with hierarchical structure

et al. 2016

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Many chemical compositions produce layered solids consisting of extended sheets with thickness not greater than a few nanometers. The layers are weakly bonded together in a crystal and can be modified into various nanoarchitectures including porous hierarchical structures. Several classes of 2-dimensional (2D) materials have been extensively studied and developed because of their potential usefulness as catalysts and sorbents. They are discussed in this review with focus on clays, layered transition metal oxides, silicates, layered double hydroxides, metal(iv) phosphates and phosphonates, especially zirconium, and zeolites. Pillaring and delamination are the primary methods for structural modification and pore tailoring. The reported approaches are described and compared for the different classes of materials. The methods of characterization include identification by X-ray diffraction and microscopy, pore size analysis and activity assessment by IR spectroscopy and catalytic testing. The discovery of layered zeolites was a fundamental breakthrough that created unprecedented opportunities because of (i) inherent strong acid sites that make them very active catalytically, (ii) porosity through the layers and (iii) bridging of 2D and 3D structures. Approximately 16 different types of layered zeolite structures and modifications have been identified as distinct forms. It is also expected that many among the over 200 recognized zeolite frameworks can produce layered precursors. Additional advances enabled by 2D zeolites include synthesis of layered materials by design, hierarchical structures obtained by direct synthesis and top-down preparation of layered materials from 3D frameworks.

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Section: Figure 13mentioning

confidence: 99%

Layer like porous materials with hierarchical structure

et al. 2016

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“…4 The natural MMT with exchangeable cations can be transformed into hydrophobic organic MMT by replacing the metal ions with inorganic ones like silica and organic ones like quaternary ammonium salts. 5,6 Such modied materials have a larger basal spacing between two layers as well as lower surface energy and can be compatible with organic liquids or polymers. Moreover, the change in the surface property inuences the use of MMT clay in different areas.…”

Section: Introductionmentioning

confidence: 99%