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Palladium catalysts deposited on silica materials: Comparison of catalysts based on mesoporous and amorphous supports in Heck reaction
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SYSNO ASEP 0352624 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Palladium catalysts deposited on silica materials: Comparison of catalysts based on mesoporous and amorphous supports in Heck reaction Tvůrce(i) Demel, J. (CZ)
Čejka, Jiří (UFCH-W) RID, ORCID, SAI
Štěpnička, P. (CZ)Zdroj.dok. Journal of Molecular Catalysis A-Chemical. - : Elsevier - ISSN 1381-1169
Roč. 329, 1-2 (2010), s. 13-20Poč.str. 8 s. Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova heterogeneous catalysts ; immobolized catalysts ; supported catalysts Vědní obor RIV CF - Fyzikální chemie a teoretická chemie CEP GA104/09/0561 GA ČR - Grantová agentura ČR CEZ AV0Z40400503 - UFCH-W (2005-2011) UT WOS 000281321000003 DOI 10.1016/j.molcata.2010.06.011 Anotace Palladium catalysts supported on different silica-based materials were investigated in the Heck reaction of n-butyl acrylate with bromobenzene at 160 degrees C. The main objective was to understand the role of mesopores in the catalysts supported on SBA-15 functionalised with (CH2)(3)NH(CH2)(2)NEt2 donor groups at the surface in comparison with the analogous silica gel-based catalysts. The results obtained evidence a crucial influence of the ratio of the anchoring groups to palladium (N/Pd): a higher excess of coordinating groups in the catalysts results in a higher catalytic activity, probably because such supports aid the deposition of the metal onto the support and, simultaneously, prevent aggregation of the 'active' metal species at high reaction temperatures. This is very important as the reactions with deposited palladium catalysts typically take place in solution with the metal first leaching out from the support and then returning back to the solid matrix. Pracoviště Ústav fyzikální chemie J.Heyrovského Kontakt Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Rok sběru 2011
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