Palladium catalysts deposited on silica materials: Comparison of catalysts based on mesoporous and amorphous supports in Heck reaction

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F10%3A10051893" target="_blank" >RIV/00216208:11310/10:10051893 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61388955:_____/10:00352624

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Palladium catalysts deposited on silica materials: Comparison of catalysts based on mesoporous and amorphous supports in Heck reaction

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Palladium catalysts deposited on silica materials: Comparison of catalysts based on mesoporous and amorphous supports in Heck reaction

Popis výsledku anglicky

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.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CF - Fyzikální chemie a teoretická chemie

OECD FORD obor

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Projekt

<a href="/cs/project/GA104%2F09%2F0561" target="_blank" >GA104/09/0561: Deponované nanočásticové katalyzátory pro tvorbu vazeb C-C</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2010

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of molecular catalysis a-chemical

ISSN

1381-1169

e-ISSN

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Svazek periodika

329

Číslo periodika v rámci svazku

1-2

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

8

Strana od-do

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Kód UT WoS článku

000281321000003

EID výsledku v databázi Scopus

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