Počet záznamů: 1
Incorporation of Ti as a Pyramidal Framework Site in the Mono-Layered MCM-56 Zeolite and its Oxidation Activity
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SYSNO ASEP 0517220 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Incorporation of Ti as a Pyramidal Framework Site in the Mono-Layered MCM-56 Zeolite and its Oxidation Activity Tvůrce(i) Korzeniowska, A. (PL)
Grzybek, J. (PL)
Roth, W. J. (PL)
Kowalczyk, A. (PL)
Michorczyk, P. (PL)
Čejka, Jiří (UFCH-W) RID, ORCID, SAI
Přech, J. (CZ)
Gil, B. (PL)Zdroj.dok. ChemCatChem. - : Wiley - ISSN 1867-3880
Roč. 11, č. 1 (2019), s. 520-527Poč.str. 8 s. Jazyk dok. eng - angličtina Země vyd. DE - Německo Klíč. slova hydrothermal synthesis ; selective-oxidation ; hydrogen-peroxide ; molecular-sieves ; titanium ; titanosilicate ; mww ; epoxidation ; catalyst ; silicalite ; Zeolites Vědní obor RIV CF - Fyzikální chemie a teoretická chemie Obor OECD Physical chemistry CEP GBP106/12/G015 GA ČR - Grantová agentura ČR Způsob publikování Omezený přístup Institucionální podpora UFCH-W - RVO:61388955 UT WOS 000457144200044 EID SCOPUS 85052649973 DOI 10.1002/cctc.201800981 Anotace 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)(2)OiPr(2)). 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 insitu measurement of UV-Vis spectra during calcination. It showed the band at 290nm, which disappeared at 500 degrees 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. Pracoviště Ústav fyzikální chemie J.Heyrovského Kontakt Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Rok sběru 2020 Elektronická adresa http://hdl.handle.net/11104/0302500
Počet záznamů: 1