Evaluating Pore Sizes in Mesoporous Materials: A Simplified Standard Adsorption Method and a Simplified Broekhoff−de Boer Method
- 25 June 1999
- journal article
- research article
- Published by American Chemical Society (ACS) in Langmuir
- Vol. 15 (16), 5403-5409
- https://doi.org/10.1021/la990209u
Abstract
The diameters of primary mesopores in materials with well-defined cylindrical pores can be accurately determined by the 4V/A method when the volume and surface area are determined by a standard adsorption method and 13.5 Å2 is used as the molecular area of adsorbed nitrogen. A simple method for determining standard adsorption using the statistical thickness of the adsorbed gas layer defined by Frenkel−Halsey−Hill (FHH) theory is described. For materials in which the pores are not cylindrical or well-defined, a simplified Broekhoff−de Boer method can be used to determine pore dimensions. The use of Hill's approximation for the thickness of the adsorbed gas layer in the Broekhoff−de Boer method simplifies its use. The results of these methods on small pore MCM-41 materials, large pore SBA-15 materials, and spherical pore mesocellular foams are reported.This publication has 39 references indexed in Scilit:
- Fluoride-Induced Hierarchical Ordering of Mesoporous Silica in Aqueous Acid-SynthesesAdvanced Materials, 1999
- Mesocellular Siliceous Foams with Uniformly Sized Cells and WindowsJournal of the American Chemical Society, 1998
- Peroxidative Halogenation Catalyzed by Transition-Metal-Ion-Grafted Mesoporous Silicate MaterialsJournal of the American Chemical Society, 1997
- Evaluation of Pore Structure Parameters of MCM-41 Catalyst Supports and Catalysts by Means of Nitrogen and Argon AdsorptionThe Journal of Physical Chemistry B, 1997
- Calculation of pore size from adsorption dataReaction Kinetics, Mechanisms and Catalysis, 1994
- Ordered mesoporous molecular sieves synthesized by a liquid-crystal template mechanismNature, 1992
- Studies on pore systems in catalysts XI. Pore distribution calculations from the adsorption branch of a nitrogen adsorption isotherm in the case of ?ink-bottle? type poresJournal of Catalysis, 1968
- Studies on pore systems in catalysts X. Calculations of pore distributions from the adsorption branch of nitrogen sorption isotherms in the case of open cylindrical pores B. ApplicationsJournal of Catalysis, 1967
- The Determination of Pore Volume and Area Distributions in Porous Substances. I. Computations from Nitrogen IsothermsJournal of the American Chemical Society, 1951
- Adsorption of Gases in Multimolecular LayersJournal of the American Chemical Society, 1938