Isoreticular UTL-Derived Zeolites as Model Materials for Probing Pore Size-Activity Relationship
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F19%3A10403409" target="_blank" >RIV/00216208:11310/19:10403409 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=S3NijiG6W1" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=S3NijiG6W1</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acscatal.9b00950" target="_blank" >10.1021/acscatal.9b00950</a>
Alternative languages
Result language
angličtina
Original language name
Isoreticular UTL-Derived Zeolites as Model Materials for Probing Pore Size-Activity Relationship
Original language description
The relationship between the chemical composition and the activity of zeolites has been unambiguously established and used to optimize some reactions. However, the relationship between the micropore size and the activity of catalysts remains elusive. Here, we report the combination of the ADOR approach and postsynthetic alumination for the preparation of isoreticular Al-IPC materials as model catalysts to assess the effect of micropore size on their catalytic activity. XRD, SEM, N-2 ad-/desorption, chemical analysis, Al-27 NMR, and FTIR spectroscopy of adsorbed acetonitrile-d(3) show that the prepared isoreticular Al-IPC zeolites have similar Al content and coordination states as well as similar types and total numbers of acid sites but differ in micropore size, decreasing in the following order: Al-IPC-7 (14, 12, and 10-ring channels) > Al-IPC-2 (12 and 10) > Al-IPC-6 (12, 10, and 8) > Al-IPC-4 (10 and 8). Furthermore, the kinetic study of gas-phase ethanol-to diethyl ether transformation evidenced a lack of confinement in ethanol dimers of IPC-6 and IPC-4 (k(first) = 0.4-0.9 mol(DEE) (mol(H+).s)(-1)) compared with IPC-2 (k(first) = 3.8 mol(DEE) (mol(H+).s)(-1)) and IPC-7 (k(first) = 6.3 mol(DEE) (mol(H+).s)(-1)) zeolites. The catalytic activity of IPC-zeolites in liquid-phase tetrahydropyranylation was correlated with the relative concentration of acid sites on the external surface of Al-IPC-n crystals, both increasing in the following order: IPC-4 (35% of "external" acid sites) < IPC-6 (29%) < IPC-2 (25%) < IPC-7 (21%). The use of Al-IPC-n as model catalysts in important acid-catalyzed reactions can shed a light on the fundamental structure-activity relationship and help to improve or optimize existing catalytic processes.
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
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Continuities
S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
ACS Catalysis
ISSN
2155-5435
e-ISSN
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Volume of the periodical
9
Issue of the periodical within the volume
6
Country of publishing house
US - UNITED STATES
Number of pages
11
Pages from-to
5136-5146
UT code for WoS article
000471212600041
EID of the result in the Scopus database
2-s2.0-85067115671