A comparative study of the effect of addition of CeO
                x
               and Li2O on γ-Al2O3 supported copper, silver and gold catalysts in the preferential oxidation of CO

Lippits, M.J.; Gluhoi, AC Andreea; Nieuwenhuys, BE Bernard

doi:10.1007/s11244-007-0289-5

Cited by 37 publications

(24 citation statements)

References 27 publications

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“…Similar results were obtained for the other analysed samples (images not shown). Other authors also found gold in the reduced state in doped alumina materials, as reported in the literature (Grisel et al 2000(Grisel et al , 2001(Grisel et al , 2002aGrisel and Nieuwenhuys 2001a, b;Gluhoi et al 2003Gluhoi et al , 2004Gluhoi et al , 2005aGluhoi et al , b, 2006aLin et al 2004;Gavril et al 2006;Gluhoi and Nieuwenhuys 2007a, b;Lippits et al 2007Lippits et al , 2008Lippits et al , 2009). …”

Section: X-ray Photoelectron Spectroscopysupporting

confidence: 56%

“…Commercial oxide samples were used from Fluka (CeO 2 ), Sigma Aldrich (Co 2 O 3 , Fe 2 O 3 , La 2 O 3 , and NiO), Riedel-de Haën (CuO), Merck (MgO, MnO 2 ) and Evonik Degussa (ZnO). Doped alumina samples were also obtained by traditional impregnation of Al 2 O 3 with precursor salts (nitrates) of the same metals (supplied by Sigma-Aldrich), followed by calcination (IC) at 350°C, as described in the literature (Grisel et al 2000(Grisel et al , 2001(Grisel et al , 2002aNieuwenhuys 2001a, b, 2007b;Gluhoi et al 2004Gluhoi et al , 2005aGluhoi et al , 2006bLin et al 2004;Lippits et al 2007Lippits et al , 2008Lippits et al , 2009). The metal load (7% wt.)…”

Section: Methodsmentioning

confidence: 99%

“…Also the values of samples prepared by PM (the smallest obtained in this work) are larger than those reported in the literature for c-alumina doped samples prepared by IC: the Fe/d-alumina PM sample showed gold particle sizes of 8-12 nm [compared with 3-10 nm from literature for a Fe/c-alumina IC sample (Grisel and Nieuwenhuys 2001a;Grisel et al 2001;Gluhoi et al 2005b;Gluhoi and Nieuwenhuys 2007a)], Ni/alumina had 11-15 nm [4-5 nm was reported in literature (Grisel and Nieuwenhuys 2001a;Grisel et al 2001)], Cu/alumina had 12-16 nm [literature refers 3-7 nm (Grisel et al 2001;Lin et al 2004) and 18 nm (Grisel and Nieuwenhuys 2001a)], Zn/alumina had 7-13 nm [literature reports 4-5 nm (Grisel and Nieuwenhuys 2001a;Grisel et al 2001)], Ce/alumina had 11-15 nm [literature: 1.7-5. 8 nm (Grisel et al 2002a;Gluhoi et al 2003Gluhoi et al , 2004Gluhoi et al , 2005bLin et al 2004;Gluhoi and Nieuwenhuys 2007b;Lippits et al 2007Lippits et al , 2008]. Again, works from other authors used c-alumina, while we had d-alumina.…”

Section: Transmission Electron Spectroscopymentioning

confidence: 99%

“…Many supports have been used so far, including doped aluminas (Grisel et al 2000(Grisel et al , 2001(Grisel et al , 2002aGrisel and Nieuwenhuys 2001a, b;Gluhoi et al 2003Gluhoi et al , 2004Lin et al 2004;Szabo et al 2005Szabo et al , 2007Szabo et al , 2008Szabo et al , 2009Gluhoi et al 2005a, b;2006a, b;Gluhoi and Nieuwenhuys 2007a, b;Lippits et al 2007Lippits et al , 2008Lippits et al , 2009Tornpos et al 2008Tornpos et al , 2010. Detailed studies on the effects of addition of (earth) alkali metals to Au/c-Al 2 O 3 catalysts, reveal that the (earth) alkali metal oxide MO x (where M is the metal) acts as structural promoter, stabilizing the Au nanoparticles, preventing them from sintering under mild conditions; and facilitating the O 2 activation, Electronic supplementary material The online version of this article (doi:10.1007/s13204-011-0037-9) contains supplementary material, which is available to authorized users.…”

Section: Introductionmentioning

confidence: 99%

“…Most doped aluminas described in literature were obtained by impregnation of a metal oxide precursor solution into the alumina support, followed by calcination between 350 and 450°C (Grisel et al 2000(Grisel et al , 2001(Grisel et al , 2002aGrisel and Nieuwenhuys 2001a, b ;Gluhoi et al 2004Gluhoi et al , 2005aGluhoi et al , 2006bLin et al 2004;Szabo et al 2005Szabo et al , 2007Szabo et al , 2008Szabo et al , 2009Gluhoi and Nieuwenhuys 2007a, b ;Lippits et al 2007Lippits et al , 2008Lippits et al , 2009Tornpos et al 2008Tornpos et al , 2010, and were prepared using a metal/Al ratio of 1:15 (Gluhoi et al 2005a). Since this procedure is quite lengthy, involves a calcination step, and the results obtained are aluminas doped with metal oxides, we decided to compare the results obtained with the ''classical'' doping method of impregnation and calcination (IC) with those obtained by a simpler method: directly adding the metal oxide to the alumina support by physical mixture (PM), and test both types of materials for CO oxidation, before and after gold addition.…”

Section: Introductionmentioning

confidence: 99%

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Gold on oxide-doped alumina supports as catalysts for CO oxidation

2011

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The effect of doping a commercial alumina support with metal oxides of Ce, Co, Cu, Fe, La, Mg, Mn, Ni and Zn was investigated. Doped d-Al 2 O 3 samples were obtained by simple physical mixture (PM) of the alumina with the desired commercial oxide and by traditional impregnation of alumina with precursor salts of the same metals followed by calcination (IC). The metal load (7% wt.) was the same in both cases. Gold (1% wt.) was loaded using a liquid phase reductive deposition method. The obtained materials were characterized by adsorption of N 2 at -196°C, temperature programmed reduction, X-ray diffraction, energy-dispersive X-ray spectrometry and transmission electron microscopy. Both samples prepared by PM and IC showed a mixture of the d-alumina phase with the respective metal oxide, but the BET surface areas of the IC samples were, in general, higher than those of the PM materials. The particle size of the oxide phases were larger for the PM samples than for the IC materials. Nevertheless, catalytic experiments for CO oxidation showed that PM samples were much more active than IC. That could be explained by the size of gold nanoparticles, well known to be related with catalytic activity, that was lower in samples prepared by PM (7-16 nm) than by IC (11-17 nm). Gold was found to be in the metallic state. The most active samples were aluminas containing Zn and Fe prepared by PM that had the smallest gold nanoparticles sizes (7-13 and 8-12 nm, respectively) and had room temperature activities for CO conversion of 0.62 and 1.34 mol CO h -1 g Au -1 , respectively, which are larger than those found in the literature for doped c-alumina samples.

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