Effect of Drying Conditions of Au–Mn Co-Precipitates for Low-Temperature CO Oxidation

Lee, Seung-Jae; Gavriilidis, Asterios; Pankhurst, Quentin A.; Kyek, Andreas; Wagner, F. E.; Wong, P.C.; Yeung, King Lun

doi:10.1006/jcat.2001.3209

Cited by 107 publications

(57 citation statements)

References 45 publications

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“…To the best of our knowledge, this is the first report so far on gold loading into exotemplated manganese oxide supports. In fact the Au/Mn x O y combination itself is not very common in the literature [9][10][11][12][13][14][15][16][17][18][19][20][21], when compared with the extensive work carried out in other supports, such as TiO 2 and CeO 2 (see reviews [22,23]). Also not much has been reported on MnO x catalysts, either pure [24][25][26][27] or with Au [9-11, 13, 14, 16-18, 20, 21] for CO oxidation.…”

Section: Introductionmentioning

confidence: 99%

Carbon Monoxide Oxidation Catalysed by Exotemplated Manganese Oxides

et al. 2009

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Manganese oxides were synthesized by exotemplating using carbon materials as templates. The catalytic activity for CO oxidation was found to be mainly related with the availability of the lattice oxygen that can react with CO. Loading the materials with Au increased the activity only for the activated carbon exotemplated samples. This is due to the Au low particle size found for these samples, in contrast with others prepared with carbon xerogels.

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Section: Introductionmentioning

confidence: 99%

Carbon Monoxide Oxidation Catalysed by Exotemplated Manganese Oxides

et al. 2009

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“…[1][2][3] Among the examples, gold supported on manganese dioxide is a superior catalyst to convert CO to CO2 at low temperatures. [4][5][6][7] Catalytic activity depends on gold particle size. The precursor of the catalyst is usually prepared by adding a mixed aqueous solution of H[AuCl4] and Mn(NO3)2 into an aqueous Na2CO3 solution.…”

Section: Introductionmentioning

confidence: 99%

The Effect of UV Irradiation on the Reduction of Au(III) Ions Adsorbed on Manganese Dioxide

et al. 2005

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The effect of UV (ultraviolet) irradiation on the adsorption of Au(III) ions on manganese dioxide and their reduction to Au(0) (gold with 0 valence state) was investigated using XPS (X-ray photoelectron spectroscopy) and 197 Au Mössbauer spectroscopy. The UV irradiation accelerated the adsorption and the reduction. From the fact that the proportion of Au(0) estimated from Au 4f XPS spectra for surface analysis was significantly smaller than that from 197 Au Mössbauer spectra for bulk analysis, we deduced that Au(0) was interpenetrated to the inside of manganese dioxide (into deeper places than about 30 Å) where XPS is impossible to detect. The content of surface hydroxyl groups on manganese dioxide also increased due to the UV irradiation. The relationship between the charge in the content of hydroxyl groups and the interpenetration of Au (0) is discussed.

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“…Using this method Au on α-Fe 2 O 3 [29][30][31][32][33][34][35][36][37][38][39][40], MnOx [41], ZnO [42][43][44][45] can be prepared with good dispersion. Addition of magnesium citrate during or after the precipitation was shown to be beneficial in some cases such as for Au/TiO 2 [46].…”

Section: Co-precipitationmentioning

confidence: 99%