Au/MgO catalysts modified with ascorbic acid for low temperature CO oxidation

Margitfalvi, József L.; Fási, András; Hegedűs, Mihály; Lónyi, Ferenc; Gőbölös, S.; Bogdanchikova, Nina

doi:10.1016/s0920-5861(01)00489-8

Cited by 105 publications

(69 citation statements)

References 21 publications

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“…Further details can be found elsewhere [48][49][50][51][52]. [37,[39][40][41][42][56][57][58]. Addition of gold to the oxides, by any of the methods, did not produce significant changes in the BET surface areas, as seen in Table S-1 in the Electronic Supplementary Material (ESM).…”

Section: Catalytic Testsmentioning

confidence: 87%

Gold supported on metal oxides for carbon monoxide oxidation

Carabineiro

Bogdanchikova²,

Avalos-Borja³

et al. 2010

Nano Res.

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Au has been loaded (1% wt.) on different commercial oxide supports (CuO, La 2 O 3 , Y 2 O 3 , NiO) by three different methods: double impregnation (DIM), liquid-phase reductive deposition (LPRD), and ultrasonication (US). Samples were characterised by N 2 adsorption at -196 °C , high-resolution transmission electron microscopy, selected area electron diffraction, energy dispersive X-ray spectrometry, high-angle annular dark-field imaging (Z-contrast), X-ray diffraction, and temperature programmed reduction. CO oxidation was used as a test reaction to compare the catalytic activities. The best results were obtained with Au loaded by DIM on the NiO support, with an activity of 7.2 × 10 -4 mol CO· g Au -1 · s -1 at room temperature. This is most likely related to the Au nanoparticle size being the smallest in this catalyst (average 4.8 nm), since it is well known that gold particle size determines the catalytic activity. Other samples, having larger Au particle sizes (in the 2-12 nm range, with average sizes ranging from 4.8 to 6.8 nm), showed lower activities. Nevertheless, all samples prepared by DIM had activities (from 1.1 × 10 -4 to 7.2 × 10 -4 mol CO· g Au -1 · s -1 , at room temperature) above those reported in the literature for gold on similar oxide supports. Therefore, this method gives better results than the most usual methods of deposition-precipitation or co-precipitation.

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Section: Catalytic Testsmentioning

confidence: 87%

Gold supported on metal oxides for carbon monoxide oxidation

Carabineiro

Bogdanchikova²,

Avalos-Borja³

et al. 2010

Nano Res.

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“…It should be noted that in the case of gold, the oxide spontaneously decompose to the metal at T > 200 °C. As the effect of temperature is normally detrimental from the metal dispersion point of view, sometimes a reduction step with H 2 or, under basic conditions with HCHO or HCOOH can be used instead of calcination [11][12][13][14].…”

Section: Impregnationmentioning

confidence: 99%

The Art of Manufacturing Gold Catalysts

Prati

Villa

2011

Catalysts

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“…A technique more widely diffuse both in academic and industrial laboratories, reproducible and fast, such as chemisorption test, should be very useful for these systems. Unfortunately, as well known, gold does not chemisorb many molecules easily, and in fact there are only few scientific works related to characterization of supported gold by chemisorption methods [1][2][3][4][5]. We have recently shown [6] that CO chemisorption by a pulse flow technique and Fourier transform infrared measurements of adsorbed CO in well defined and controlled conditions of temperature and pressure can be taken as effective methods for the quantitative determination of the gold active sites on Au/TiO 2 and Au/Fe 2 O 3, two reference catalysts provided by the World Gold Council, and on a Au/CeO 2 sample.…”

Section: Introductionmentioning

confidence: 99%