Carbon Monoxide Oxidation Catalysed by Exotemplated Manganese Oxides

Carabineiro, Sónia A. C.; Bastos, Samuel; Órfão, J.J.M.; Pereira, M.F.R.; Delgado, Juan J.; Figueiredo, José

doi:10.1007/s10562-009-0251-1

Cited by 67 publications

(39 citation statements)

References 43 publications

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“…This matches well with the results obtained for the Mn/alumina samples. The characteristic green colour of MnO was observed after the TPR experiments confirming the presence of this oxide, as reported in other works (Ferrandon et al 1999;Stobbe et al 1999;Arena et al 2001;Ramesh et al 2008;Carabineiro et al 2010a). …”

Section: Temperature Programmed Reductionsupporting

confidence: 89%

“…As expected from literature, addition of gold caused the peaks of Ce (Andreeva et al 2002;Fu et al 2003Fu et al , 2005Lai et al 2006;Carabineiro et al 2010aCarabineiro et al , b, e, g, h,, 2011b and Fe (Ilieva et al 1997;Neri et al 1999;Boccuzzi et al 1999;Minico et al 2000;Hua et al 2004;Khoudiakov et al 2005;Milone et al 2005Milone et al , 2007Solsona et al 2006;Silberova et al 2006;Albonetti et al 2010) oxides to shift to much lower temperatures. The presence of gold also shifted the first two peaks of Fe/alumina to lower temperatures (to *100 and 290°C, respectively) as expected from literature (Ilieva et al 1997;Neri et al 1999;Minico et al 2000;Venugopal et al 2003;Hua et al 2004;Khoudiakov et al 2005;Milone et al 2005Milone et al , 2007Solsona et al 2006;Silberova et al 2006;).…”

Section: Temperature Programmed Reductionsupporting

confidence: 73%

“…The TPR profile for samples doped with Mn showed two peaks (Table 2). According to what was seen in previous works (Hoflund et al 1995;Ferrandon et al 1999;Stobbe et al 1999;Arena et al 2001;PalDey et al 2005;Xu et al 2006;Ramesh et al 2008;Liang et al 2008;Wang et al 2008Wang et al , 2009Carabineiro et al 2010a), the reduction of MnO 2 to Mn 3 O 4 generates a peak at *350°C, whereas reduction of Mn 3 O 4 to MnO produces a peak at *450°C, sometimes with some overlapping between the two. This matches well with the results obtained for the Mn/alumina samples.…”

Section: Temperature Programmed Reductionsupporting

confidence: 58%

“…The values obtained for samples prepared with PM are even higher, ranging from 0.12 to 2.34 mol CO h -1 g Au -1 (Table 4). The smaller gold nanoparticle size of samples prepared by PM, compared with those prepared by IC, obtained in this work (Table 3), explains the higher performance of the former, as activity is well known to be related with gold particle size (Bond and Thompson 1999Haruta 2003Haruta , 2004Hutchings and Haruta 2005;Bond et al 2006;Hashmi and Hutchings 2006;Hutchings et al 2008;Thompson 2007, 2010;Carabineiro et al 2010aCarabineiro et al , b, c, d, e, f, g, h, 2011a. Also the most active samples (Zn and Fe doped aluminas prepared by PM) were those that showed smaller gold nanoparticle sizes.…”

Section: Catalytic Tests For Co Oxidationmentioning

confidence: 60%

“…Activities (mol CO h -1 g Au -1 ) were determined at room temperature after the steady state was reached. Further details can be found elsewhere (Carabineiro et al 2010a, b, c, d, e, f, h, g, 2011a, b, Santos et al 2010.…”

Section: Methodsmentioning

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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Section: Temperature Programmed Reductionsupporting

confidence: 89%

Section: Temperature Programmed Reductionsupporting

confidence: 73%

Section: Temperature Programmed Reductionsupporting

confidence: 58%

Section: Catalytic Tests For Co Oxidationmentioning

confidence: 60%

Section: Methodsmentioning

confidence: 99%

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

2011

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Environmental Catalysis by Gold Nanoparticles

Carabineiro

2024

Catalysis for a Sustainable Environment

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Promoting the Reversible Oxygen Redox Reaction of Li‐Excess Layered Cathode Materials with Surface Vanadium Cation Doping

et al. 2021

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Li‐excess layered cathode (LLC) materials have a high theoretical specific capacity of 250 mAh g−1 induced by transition metal (cationic) and oxygen (anionic) redox activity. Especially, the oxygen redox reaction related to the activation of the Li2MnO3 domain plays the crucial role of providing a high specific capacity. However, it also induces an irreversible oxygen release and accelerates the layered‐to‐spinel phase transformation and capacity fading. Here, it is shown that surface doping of vanadium (V5+) cations into LLC material suppresses both the irreversible oxygen release and undesirable phase transformation, resulting in the improvement of capacity retention. The V‐doped LLC shows a high discharge capacity of 244.3 ± 0.8 mAh g−1 with 92% retention after 100 cycles, whereas LLC delivers 233.6 ± 1.1 mAh g−1 with 74% retention. Furthermore, the average discharge voltage of V‐doped LLC drops by only 0.33 V after 100 cycles, while LLC exhibits 0.43 V of average discharge voltage drop. Experimental and theoretical investigations indicate that doped V‐doping increase the transition metal–oxygen (TMO) covalency and affect the oxidation state of peroxo‐like (O2)n− species during the delithiation process. The role of V‐doping to make the oxygen redox reversible in LLC materials for high‐energy density Li‐ion batteries is illustrated here.

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Carbon Monoxide Oxidation Catalysed by Exotemplated Manganese Oxides

Cited by 67 publications

References 43 publications

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

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

Environmental Catalysis by Gold Nanoparticles

Promoting the Reversible Oxygen Redox Reaction of Li‐Excess Layered Cathode Materials with Surface Vanadium Cation Doping

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