Počet záznamů: 1
Proton proximity – New key parameter controlling adsorption, desorption and activity in propene oligomerization over H-ZSM-5 zeolites
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SYSNO ASEP 0464693 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Proton proximity – New key parameter controlling adsorption, desorption and activity in propene oligomerization over H-ZSM-5 zeolites Tvůrce(i) Bernauer, Milan (UFCH-W) ORCID, RID
Tabor, Edyta (UFCH-W) RID, ORCID
Pashkova, Veronika (UFCH-W) RID, ORCID
Kaucký, Dalibor (UFCH-W) RID, ORCID
Sobalík, Zdeněk (UFCH-W) RID
Wichterlová, Blanka (UFCH-W) RID
Dědeček, Jiří (UFCH-W) RID, ORCIDZdroj.dok. Journal of Catalysis. - : Elsevier - ISSN 0021-9517
Roč. 344, DEC 2016 (2016), s. 157-172Poč.str. 16 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova ZSM-5 ; Al siting ; Single Al Vědní obor RIV CF - Fyzikální chemie a teoretická chemie CEP GA15-13876S GA ČR - Grantová agentura ČR LM2015073 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Institucionální podpora UFCH-W - RVO:61388955 UT WOS 000390182800016 EID SCOPUS 84991660817 DOI 10.1016/j.jcat.2016.09.025 Anotace The proximity of protons (∼5 Å) derived from the distribution of Al atoms in the H-ZSM-5 framework has been shown to substantially affect the rate of propene oligomerization. Two sets of H-ZSM-5 zeolites (Si/Al 13–30) greatly differing in the occurrence of Al pairs (AlSiSiAl sequences in 6MRs) or distant Al atoms in the framework (both located prevailingly at the channel intersections) were synthesized to analyze the effect of the proton proximity. Propene adsorption and formation of oligomeric alkoxides is faster over distant isolated protons, while the close (5 Å) positive charges of proximate protons result in faster olefin(s) release from H-bonded propene and oligomeric alkoxides. As the steady-state TOF of propene oligomerization to C4–C9 olefins at 473–533 K over close protons exceeds 2–10 fold (with increasing Si/Al) those over isolated protons, the release of olefins from alkoxides is suggested to be an important reaction step. The distribution of framework Al atoms determining the mutual distances of protons represents a new parameter for evaluating rates of acid-catalyzed reactions and individual steps over H-zeolites. Pracoviště Ústav fyzikální chemie J.Heyrovského Kontakt Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Rok sběru 2017
Počet záznamů: 1