Journal ArticleDOI
Pore wall of a mesoporous molecular sieve derived from kanemite
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The pore diameters and pore wall thickness of mesoporous molecular sieves derived from a layered silicate (kanemite) were estimated by X-ray diffraction, physisorption, transmission electron micrographs, 29Si MAS NMR, and modeling and simulation.Abstract:
The pore diameters and pore wall thicknesses of the mesoporous molecular sieves FSM-16 derived from a layered silicate (kanemite) were estimated by X-ray diffraction, physisorption, transmission electron micrographs, 29Si MAS NMR, and modeling and simulation. The XRD simulation with a simple model of a hexagonal array of cylinders gave reasonable values coinciding with those obtained by TEM and nitrogen adsorption, with some corrections. As-synthesized FSM-16 material had pore walls 0.4 nm thick, corresponding to the slightly less wrinkled single SiO4 tetrahedral layer observed in the crystalline layered silicate minerals, and an apparent pore diameter of 4.2 nm. Surfactant-free FSM-16, formed by calcination and exchange for H+, had thicker pore walls of 0.8 and 0.9 nm corresponding to double SiO4 tetrahedral layers and pore diameters of 3.4 and 3.7 nm.read more
Citations
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On the Controllable Soft-Templating Approach to Mesoporous Silicates
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TL;DR: In this paper, Zhao et al. used powder X-ray diffraction (XRD), thermogravimetric analysis (TGA), and nitrogen adsorption to characterize SBA-15 ordered mesoporous silicas.
Journal ArticleDOI
Density functional theory methods for characterization of porous materials
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Journal ArticleDOI
Recent advances in processing and characterization of periodic mesoporous MCM-41 silicate molecular sieves
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Journal ArticleDOI
Density functional theory model for calculating pore size distributions: pore structure of nanoporous catalysts
TL;DR: In this article, the pore size distributions from nitrogen and argon adsorption isotherms are calculated using the non-local density functional theory (NLDFT) model.
References
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Journal ArticleDOI
Ordered mesoporous molecular sieves synthesized by a liquid-crystal template mechanism
TL;DR: In this paper, the synthesis of mesoporous inorganic solids from calcination of aluminosilicate gels in the presence of surfactants is described, in which the silicate material forms inorganic walls between ordered surfactant micelles.
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Anthropogenic influence on the distribution of tropospheric sulphate aerosol
TL;DR: The authors used a global transport-chemistry model to estimate the changes in the distribution of tropospheric sulphate aerosol and deposition of non-seasalt sulphur that have occurred since pre-industrial times.
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Syntheses of Highly Ordered Mesoporous Materials, FSM-16, Derived from Kanemite
TL;DR: In this paper, the formation process of mesoporous materials from kanemite was divided into two elemental processes: i) exchange of Na+ in the interlayer of kanemites for alkyltrimethylammonium cations and ii) condensation of silicates and formation of a three dimensional silicate framework.
Journal ArticleDOI
Synthesis and comparative reactivity and electronic structural features of [MFe3S4]z+ cubane-type clusters (M = iron, cobalt, nickel)
TL;DR: In this article, the heterometal cubane type clusters [CoFe 3 S 45 (Smes) 4 ] 2 and [NiFeS 4 (PPh 3 )(Smes' 3 ] 2] have been prepared in good yield as Et 4 N + salts by reductive rearrangement reactions of the linear cluster with Co(I) and Ni(0) reactants, respectively.
Journal ArticleDOI
Physisorption of argon, nitrogen and oxygen by MCM-41, a model mesoporous adsorbent
Peter J. Branton,Peter G. Hall,Kenneth S. W. Sing,Horst Reichert,Ferdi Schüth,Klaus K. Unger +5 more
TL;DR: Adsorption isotherms of argon, nitrogen and oxygen have been determined at 77 K on a sample of MCM-41, a novel form of aluminosilicate as mentioned in this paper.