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Comprehensive Study of Surface Chemistry of MCM-41 Using29Si CP/MAS NMR, FTIR, Pyridine-TPD, and TGA
Abstract
A comprehensive study was conducted on mesoporous MCM-41. Spectroscopic examinations demonstrated that three types of silanol groups, i.e., single, (SiO) 3 Si−OH, hydrogen-bonded, (SiO) 3 Si−OH-OH−Si(SiO) 3, and geminal, (SiO) 2 Si(OH) 2, can be observed. The number of silanol groups/nm 2, α OH, as determined by NMR, varies between 2.5 and 3.0 depending on the template-removal methods. All these silanol groups were found to be the active sites for adsorption of pyridine with desorption energies of 91.4 and 52.2 kJ mol -1, respectively. However, only free silanol groups (involving single and geminal silanols) are highly accessible to the silylating agent, chlorotrimethylsilane. Silylation can modify both the physical and chemical properties of MCM-41.
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Self-citation
Cited by
Ordered mesoporous materials in catalysis
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Metadata
- Authors
- Zhao, X. S., Lu, G. Q., Whittaker, A. K., Millar, G. J., & Zhu, H. Y.
- Venue
- The Journal of Physical Chemistry B
- Publisher
- American Chemical Society (ACS)
- Published
- 1997-08-01
- Volume
- 101
- Issue
- 33
- Pages
- 6525-6531
- ISSN
- 1520-5207 (ISSN-L)
- 1520-6106
- OpenAlex
- W2011762585
- Cited by
- 708
- References
- 22
- FWCI
- 19.93
- Type
- journal article
- Language
- en
- Open access
- closed
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