The DOI matches its Crossref record; 15 of the 15 references it cites were found in a registry or an index.
Characterization of Large-Pore MCM-41 Molecular Sieves Obtained via Hydrothermal Restructuring
Abstract
MCM-41 periodic mesoporous silicates were synthesized using cetyltrimethylammonium bromide, and their pore sizes were tailored by postsynthesis hydrothermal treatment method of Khushalani et al., allowing us to obtain large-pore MCM-41 samples with a high degree of structural ordering. It was shown that the pore size enlargement was accompanied by a significant improvement of pore size uniformity, a gradual decrease of the specific surface area, and the pore wall thickening. After a certain upper limit of pore size (i.e., about 6.5 nm) was reached, a further hydrothermal treatment led to samples of diminished quality. The structural uniformity decreases dramatically, i.e., the pore size distribution becomes broader and a small but noticeable amount of micropores develops. Moreover, the appearance of pore blocking effects (as inferred from the irreversibility of nitrogen adsorption−desorption isotherms) indicates that the pore geometry deviates significantly from its initial cylindrical shape characteristic for MCM-41 materials. The current study confirmed previous findings that the hydrothermal restructuring method is a convenient way to synthesize high quality MCM-41 silicates with tailored pore sizes, but only up to 6.5 nm.
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Characterization of nanoporous materials from adsorption and desorption isotherms
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Metadata
- Authors
- Sayari, A., Liu, P., Kruk, M., & Jaroniec, M.
- Venue
- Chemistry of Materials
- Publisher
- American Chemical Society (ACS)
- Published
- 1997-11-01
- Volume
- 9
- Issue
- 11
- Pages
- 2499-2506
- ISSN
- 0897-4756 (ISSN-L)
- 1520-5002
- OpenAlex
- W2011804950
- Cited by
- 338
- References
- 15
- FWCI
- 17.32
- Type
- journal article
- Language
- en
- Open access
- closed
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