Počet záznamů: 1
Ru-Based Complexes with Quaternary Ammonium Tags Immobilized on Mesoporous Silica as Olefin Metathesis Catalysts
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SYSNO ASEP 0431081 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Ru-Based Complexes with Quaternary Ammonium Tags Immobilized on Mesoporous Silica as Olefin Metathesis Catalysts Tvůrce(i) Pastva, Jakub (UFCH-W) RID, ORCID
Skowerski, K. (PL)
Czarnocki, S. J. (PL)
Žilková, Naděžda (UFCH-W) RID, ORCID
Čejka, Jiří (UFCH-W) RID, ORCID, SAI
Bastl, Zdeněk (UFCH-W) RID, ORCID
Balcar, Hynek (UFCH-W) RID, ORCIDZdroj.dok. ACS Catalysis. - : American Chemical Society - ISSN 2155-5435
Roč. 4, č. 9 (2014), s. 3227-3236Poč.str. 10 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova olefin metathesis ; heterogeneous catalysts ; mesoporous molecular sieves Vědní obor RIV CF - Fyzikální chemie a teoretická chemie CEP GAP106/12/0189 GA ČR - Grantová agentura ČR Institucionální podpora UFCH-W - RVO:61388955 UT WOS 000341405600046 EID SCOPUS 84907703055 DOI 10.1021/cs500796u Anotace Ruthenium olefin metathesis catalysts bearing a polar quaternary ammonium group in N-heterocyclic ligand were immobilized on silica and siliceous mesoporous molecular sieves with different pore sizes (SBA-15 and MCM-41). The activity of the heterogeneous catalysts was found to increase with an increase in pore size of the support used, with the best results observed for SBA-15-supported catalyst. The influence of reaction conditions (temperature, solvent, catalyst, and substrate concentration) on the efficiency of new heterogeneous catalysts was established. A significant influence of the counterion present in the ruthenium complex on the activity of immobilized catalysts was also found: those derived from chloride containing ion exhibited the highest activity. High activity in ring-closing metathesis of substrates as citronellene, 1,7-octadiene, and diallyl compounds as well as in cross-metathesis of unsaturated aliphatic compounds with methyl acrylate was observed under optimized conditions. In some cases, heterogenization led to catalysts with efficiency higher than those observed for corresponding homogeneous complexes. Pracoviště Ústav fyzikální chemie J.Heyrovského Kontakt Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Rok sběru 2015
Počet záznamů: 1