Incorporation of Ti as a pyramidal framework site in the mono-layered MCM-56 zeolite and its oxidation activity
Authors:
- Aleksandra Korzeniowska,
- Justyna Grzybek,
- Wieslaw J. Roth,
- Andrzej Kowalczyk,
- Piotr Michorczyk,
- Jiři Čejka,
- Jan Přech,
- Barbara Gil
Abstract
MWW zeolite MCM‐56 with Al atoms on the surface was functionalized with Ti to produce pyramidal TiOH groups. This was carried out by removal of Al with nitric acid, calcination and treatment with titanium diisopropoxide bis(acetylacetonate) (Ti(acac)2 (i‐propoxide)2, Ti(acac)2OiPr2). Up to 0.7 % Ti was introduced. Using UV‐Vis spectroscopy three types of Ti moieties were identified in the uncalcined materials – tetrahedral in the framework, 5/6‐coordinated Ti on the surface, presumably in the vacated pyramidal sites, and oxide‐like clusters. The presence of TiOH on the surface was indicated by in situ measurement of UV‐Vis spectra during calcination. It showed the band at 290 nm, which disappeared at 500 °C, perhaps due to condensation with silanols. Catalytic oxidation tests were carried out with three samples containing 0.13, 0.36, and 0.70 % Ti and methyl phenyl sulfide and cis‐cyclooctene as model reactants. The study confirmed potential of the TiOH moieties in oxidation catalysis although their final form is not certain. Future studies will include increasing Ti content to enhance catalytic activity and better detection of this type of the Ti site.
- Record ID
- CUT8e29f3b77a8b43d09a7f1746dd7a89fa
- Publication categories
- ;
- Author
- Journal series
- Chemcatchem, ISSN 1867-3880, e-ISSN 1867-3899
- Issue year
- 2019
- Vol
- 11
- No
- 1
- Pages
- 520-527
- Other elements of collation
- schem.; tab.; wykr.; Bibliografia (na s.) - 527; Bibliografia (liczba pozycji) - 28; Oznaczenie streszczenia - Streszcz. ang.; Numeracja w czasopiśmie - Vol. 11, Iss. 1, Spec. Iss.
- Substantive notes
- Special Issue: 10th Anniversary Issue of ChemCatChem
- Keywords in English
- zeolites, layered compounds, Ti-MWW, pyramidal Ti-sites, oxidation reaction
- DOI
- DOI:10.1002/cctc.201800981 Opening in a new tab
- URL
- http://suw.biblos.pk.edu.pl/resourceDetailsRPK&rId=85541 Opening in a new tab
- Language
- eng (en) English
- License
- Score (nominal)
- 100
- Additional fields
- Indeksowana w: Scopus
- Uniform Resource Identifier
- https://cris.pk.edu.pl/info/article/CUT8e29f3b77a8b43d09a7f1746dd7a89fa/
- URN
urn:pkr-prod:CUT8e29f3b77a8b43d09a7f1746dd7a89fa
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