TPR and TPD investigation of

Ilieva, L.; Andreeva, D.; Andreev, A.

doi:10.1016/s0040-6031(97)00018-x

Cited by 78 publications

(51 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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;). The reduction temperature of the first peaks is reported to decrease upon gold loading (Neri et al 1999;Boccuzzi et al 1999;Milone et al 2007).…”

Section: Temperature Programmed Reductionsupporting

confidence: 72%

“…According to the literature (Ilieva et al 1997;Neri et al 1999;Boccuzzi et al 1999;Minico et al 2000;Venugopal et al 2003;Hua et al 2004;Khoudiakov et al 2005;PalDey et al 2005;Milone et al 2005Milone et al , 2007Silberova et al 2006;Albonetti et al 2010), the peak at *400°C for Fe doped sample can be attributed to the reduction of hematite (Fe 2 O 3 ) to magnetite (Fe 3 O 4 ), while the peak at *600°C arises from the reduction of Fe 3 O 4 to FeO (wustite) and finally the peak at *850°C is assigned to the reduction to Fe. Three main peaks corresponding to the those reductions were obtained at similar temperatures (Table 2), being the first more intense.…”

Section: Temperature Programmed Reductionmentioning

confidence: 91%

See 1 more Smart Citation

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

2011

View full text Add to dashboard Cite

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.

show abstract

Section: Temperature Programmed Reductionsupporting

confidence: 72%

Section: Temperature Programmed Reductionmentioning

confidence: 91%

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

2011

View full text Add to dashboard Cite

show abstract

“…A similar effect of gold on the reducibility of Fe 2 O 3 have been also reported by others [30][31][32][33].…”

Section: Selective Oxidation Of O-hydroxybenzylalcoholsupporting

confidence: 86%

“…Several hypotheses have been formulated to explain the increase of the reducibility of Fe 2 O 3 in the presence of gold. Ilieva et al have suggested that gold is able to dissociate water forming activated hydroxyl groups which promote the low temperature reduction of Fe 2 O 3 support [31]. Minico' et al concluded that the lower reduction temperature on Au/Fe 2 O 3 catalysts is due to the ability of highly dispersed gold to activate the oxygen of the iron oxide weakening the Fe-O bonds located nearby the gold atoms [33].…”

Section: Selective Oxidation Of O-hydroxybenzylalcoholmentioning

confidence: 99%

Gold supported on iron oxy-hydroxides: a versatile tool for the synthesis of fine chemicals

2006

View full text Add to dashboard Cite

“…48 The presence of gold on catalyst supports may promote the reduction of supports, as explained by the activation of H 2 on gold and the spillover of the atomic hydrogen to the support. 48,125 Hardacre and co-workers, with the aid of EXAFS, XANES, and DFT calculations, proposed another mechanism for the deactivation of Au/CeZrO 4 . 126 The deactivation was ascribed to the concentration of water that may dewet the gold atoms from the support, i.e., the gold on the support progressively detached, therefore weakening the metal-support interaction.…”

Section: Catalyst Stability and Deactivationmentioning

confidence: 99%

Water–gas shift on gold catalysts: catalyst systems and fundamental studies

Tao¹,

Ma²

2013

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

Since the pioneering finding by Haruta et al. that small gold nanoparticles on reducible supports can be highly active for low-temperature CO oxidation, the synthesis, characterization, and application of supported gold catalysts have attracted much attention. The water-gas shift reaction (WGSR: CO + H 2 O = CO 2 + H 2 ) is important for removing CO and upgrading the purity of H 2 for fuel cell applications, ammonia synthesis, and selective hydrogenation processes. In recent years, much attention has been paid to exploration the possibility of using supported gold nanocatalysts for WGSR and understanding the fundamental aspects related to catalyst deactivation mechanisms, nature of active sites, and reaction mechanisms. Here we summarize recent advances in the development of supported gold catalysts for this reaction and fundamental insights that can be gained, and furnish our assessment on the status of research progress.

show abstract

TPR and TPD investigation of

Cited by 78 publications

References 9 publications

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

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

Gold supported on iron oxy-hydroxides: a versatile tool for the synthesis of fine chemicals

Water–gas shift on gold catalysts: catalyst systems and fundamental studies

Contact Info

Product

Resources

About