Effect of hierarchical porosity in Beta zeolites on the Beckmann rearrangement of oximes
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F17%3A00506755" target="_blank" >RIV/61388955:_____/17:00506755 - isvavai.cz</a>
Result on the web
<a href="http://hdl.handle.net/11104/0297933" target="_blank" >http://hdl.handle.net/11104/0297933</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1039/c6cy01895e" target="_blank" >10.1039/c6cy01895e</a>
Alternative languages
Result language
angličtina
Original language name
Effect of hierarchical porosity in Beta zeolites on the Beckmann rearrangement of oximes
Original language description
Hierarchical Beta zeolites with different Si/Al molar ratios, synthesized by crystallization of silanized protozeolitic units, were investigated in the liquid-phase Beckmann rearrangement of cyclohexanone and cyclododecanone oximes. The hierarchical Beta samples contain mesopores with sizes in the range 2.0-6.0 nm, as well as the typical zeolite micropores, showing a great contribution of the mesopore/external surface area (300-328 m(2) g(-1)) to the BET surface area (706-763 m(2) g(-1)) and increased Lewis acidity compared to conventional Beta zeolites. Diffusional and steric limitations were found to strongly influence the oxime Beckmann rearrangement as enhanced conversions were obtained with the hierarchical Beta zeolites. The largest differences between conventional and hierarchical Beta zeolites were denoted with the bulkier oxime, i.e. in the rearrangement of cyclododecanone oxime. In this case, two stages are clearly observed in the evolution of the oxime conversion along the reaction time, with a plateau being reached at long reaction times due to deactivation by product inhibition. Hierarchical Beta zeolites exhibited superior performance in both stages compared to reference samples. These results indicate that the use of hierarchical Beta zeolites for oxime Beckmann rearrangement leads to significant improvements in the catalytic behavior compared to conventional Beta samples due to a number of factors: faster intracrystalline diffusion, availability of non-sterically hindered mesopore/surface area and lower deactivation through product inhibition.
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/GBP106%2F12%2FG015" target="_blank" >GBP106/12/G015: Intelligent design of nanoporous adsorbents and catalysts</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Catalysis Science &Technology
ISSN
2044-4753
e-ISSN
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Volume of the periodical
7
Issue of the periodical within the volume
1
Country of publishing house
GB - UNITED KINGDOM
Number of pages
10
Pages from-to
181-190
UT code for WoS article
000392399900016
EID of the result in the Scopus database
2-s2.0-85024133010