Bi has been widely employed as a modifier for Pd and Pt based catalyst mainly in order to improve selectivity. We found that when Bi was added to the bimetallic system AuPd, the effect on activity in alcohol oxidation mainly depends on the amount of Bi regardless its position, being negligible when Bi was 0.1 wt% and detectably negative when the amount was increased to 3 wt%. However, the selectivity of the reactions notably varied only when Bi was deposited on the surface of metal nanoparticles suppressing parallel reaction in both benzyl alcohol and glycerol oxidation. After a careful characterization of all the catalysts and additional catalytic tests, we concluded that the Bi influence on the activity of the catalysts could be ascribed to electronic effect whereas the one on selectivity mainly to a geometric modification. moreover, the Bi-modified AuPd/AC catalyst showed possible application in the production of tartronic acid, a useful intermediate, from glycerol.
Bismuth as a modifier of Au–Pd catalyst : enhancing selectivity in alcohol oxidation by suppressing parallel reaction / A. Villa, D. Wang, G.M. Veith, L. Prati. - In: JOURNAL OF CATALYSIS. - ISSN 0021-9517. - 292(2012 Aug), pp. 73-80.
|Titolo:||Bismuth as a modifier of Au–Pd catalyst : enhancing selectivity in alcohol oxidation by suppressing parallel reaction|
VILLA, ALBERTO (Primo)
PRATI, LAURA (Ultimo)
|Parole Chiave:||bi-modified catalyst; AuPd alloy; selective alcohol oxidation; tartronic acid|
|Settore Scientifico Disciplinare:||Settore CHIM/03 - Chimica Generale e Inorganica|
|Data di pubblicazione:||ago-2012|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/j.jcat.2012.04.021|
|Appare nelle tipologie:||01 - Articolo su periodico|