Quantification of Lewis acid sites in 3D and 2D TS-1 zeolites: FTIR spectroscopic study
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F20%3A10419838" target="_blank" >RIV/00216208:11310/20:10419838 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=tjCrfbkmMq" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=tjCrfbkmMq</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.cattod.2019.10.011" target="_blank" >10.1016/j.cattod.2019.10.011</a>
Alternative languages
Result language
angličtina
Original language name
Quantification of Lewis acid sites in 3D and 2D TS-1 zeolites: FTIR spectroscopic study
Original language description
Titanium silicalite 1 (TS-1) zeolite is an important selective oxidation catalyst. Recently prepared layered and pillared forms expanded the application of TS-1 to the catalytic oxidation of bulky molecules. Despite progress in designing and application of titanosilicate zeolites in catalysis, only qualitative information of their acidity is available. Herein, we report thorough characterization of acid sites in TS-1 zeolites of different morphologies (3D TS-1, layered 2D TS-1, 2D TS-1 pillared either with silica (TS-1-PISi) or silica-titania (TS-1-PITi)) using FTIR spectroscopy and probe molecules. FTIR of adsorbed pyridine was used for quantification of Ti-associated Lewis acid sites based on the integral intensity of nu(8a) absorption band ca. 1608 cm -1 and measured integrated molar extinction coefficient (epsilon(1608) (Ti-LAS) = 0.71 +/- 0.01 cm mu mol(-1)). Thermodesorption of pyridine monitored with FTIR showed that distribution of strength of Lewis acid sites is, to some extent, dependent on the way of Ti incorporation in the samples. TS-1-PITi, containing large fraction of external surface Ti(OH)(OSi)(3) species introduced post-synthesis, showed increased concentration of stronger Lewis acid centres. FTIR spectroscopy of TS-1 with pre-adsorbed quinoline and d(3)-acetonitrile probe confirmed enhanced relative concentration of external Lewis acid sites in all layered TS-1 materials (28-38%) vs. 3D TS-1 (2%).
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10403 - Physical chemistry
Result continuities
Project
<a href="/en/project/GX19-27551X" target="_blank" >GX19-27551X: ADORable catalysts</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Catalysis Today
ISSN
0920-5861
e-ISSN
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Volume of the periodical
345
Issue of the periodical within the volume
345
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
8
Pages from-to
80-87
UT code for WoS article
000522039100010
EID of the result in the Scopus database
2-s2.0-85075479244