Experimental and theoretical studies of sonically prepared cu-y, cu-usy and cu-zsm-5 catalysts for scr denox
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27710%2F21%3A10248133" target="_blank" >RIV/61989100:27710/21:10248133 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11310/21:10438550
Result on the web
<a href="http://file:///C:/Users/cha104/Downloads/catalysts-11-00824-v2.pdf" target="_blank" >http://file:///C:/Users/cha104/Downloads/catalysts-11-00824-v2.pdf</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3390/catal11070824" target="_blank" >10.3390/catal11070824</a>
Alternative languages
Result language
angličtina
Original language name
Experimental and theoretical studies of sonically prepared cu-y, cu-usy and cu-zsm-5 catalysts for scr denox
Original language description
The objective of our study was to prepare Y-, USY-and ZSM-5-based catalysts by hydrothermal synthesis, followed by copper active-phase deposition by either conventional ion-exchange or ultrasonic irradiation. The resulting materials were characterized by XRD, BET, SEM, TEM, Ra-man, UV-Vis, monitoring ammonia and nitrogen oxide sorption by FT-IR and Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS). XRD data confirmed the purity and structure of the Y/USY or ZSM-5 zeolites. The nitrogen and ammonia sorption results indicated that the materials were highly porous and acidic. The metallic active phase was found in the form of cations in ion-exchanged zeolites and in the form of nanoparticle metal oxides in sonochemically prepared catalysts. The latter showed full activity and high stability in the SCR deNOx reaction. The faujasite-based catalysts were fully active at 200-400o C, whereas the ZSM-5-based catalysts reached 100% activity at 400-500o C. Our in situ DRIFTS experiments revealed that Cu-O(NO) and Cu-NH3 were intermediates, also indicating the role of Bronsted sites in the formation of NH4 NO3 . Furthermore, the results from our experimental in situ spectroscopic studies were compared with DFT models. Overall, our findings suggest two possible mechanisms for the deNOx reaction, depending on the method of catalyst preparation (i.e., conventional ion-exchange vs. ultrasonic irradiation).
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
10400 - Chemical sciences
Result continuities
Project
<a href="/en/project/EF15_003%2F0000417" target="_blank" >EF15_003/0000417: Center for Advanced Materials: Design, Synthesis, and Applications</a><br>
Continuities
V - Vyzkumna aktivita podporovana z jinych verejnych zdroju
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Catalysts
ISSN
2073-4344
e-ISSN
2073-4344
Volume of the periodical
11
Issue of the periodical within the volume
7
Country of publishing house
CH - SWITZERLAND
Number of pages
21
Pages from-to
nestrankovano
UT code for WoS article
000676626000001
EID of the result in the Scopus database
2-s2.0-85109108501