Low-Temperature Oxidation of CO over Gold Supported on TiO2, α-Fe2O3, and Co3O4

Haruta, Masatake; Tsubota, Susumu; Kobayashi, Tetsuhiko; Kageyama, Hiroyuki; Genet, M.; Delmon, Bernard

doi:10.1006/jcat.1993.1322

Cited by 2,162 publications

(1,432 citation statements)

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“…After Masatake Haruta discovered (Haruta et al 1993), that small Au particles, supported on a reducible oxide support CO oxidation at temperatures lower than room temperature researchers started to wonder about the reasons. Again, the late Wayne Goodman has taken up the problem and conducted the first model studies on supported Au particles (Chen and Goodman 2008).…”

Section: Examples 21 Supported Metal Particlesmentioning

confidence: 99%

Models for heterogeneous catalysts: studies at the atomic level

Freund

2016

Rend. Fis. Acc. Lincei

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A systematic approach to model heterogeneous catalyst material and characterization at the atomic level is presented. Two examples are used to illustrate the concepts derived from those studies. They document the problems arising on the way to create such model systems and they also indicate possible solutions. The first example is connected with activation of CO 2 at the rim of electron rich MgO (thin film-supported Au islands), and the second example aims at the creation of a model system for the Phillips catalyst for ethylene polymerization and, in particular, the creation of a hydroxylated silica support.

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Section: Examples 21 Supported Metal Particlesmentioning

confidence: 99%

Models for heterogeneous catalysts: studies at the atomic level

Freund

2016

Rend. Fis. Acc. Lincei

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“…A similar performance was found for the Au/NiFe 2 O 4 catalysts. Pretreatment should be carried out in an oxygen atmosphere, in order to form gold particles strongly interacting with a metal oxide having an oxygen-enriched surface (also suggested by Haruta [15] ), or to have certain gold particles of oxidized state. Compared with the catalytic activity of support oxide, the activity data indicate that Au (gold particle) and support interact synergistically.…”

Section: Catalytic Activitiesmentioning

confidence: 99%

“…The reason for the enhancement of the catalytic performance of these supported gold catalysts is thought to be related to the CO oxidation reaction mechanism and the structure of gold catalyst, such as gold particle size and chemical state. In order to clarify the mechanism of the catalytic oxidation of CO with O 2 , in situ IR, ESR and TPD-ITD techniques have been used, and some insight into the catalytic mechanism was obtained [13][14][15][16] . Furthermore, some supported gold catalysts such as Au/MnO x , Au/Fe 2 O 3 , Au/Al 2 O 3 , Au/Co 3 O 4 and Au/Mg(OH) 2 were examined using XPS, TEM, XAFS and Mössbauer surface characterization techniques [17][18][19][20][21][22][23] .…”

Section: Introductionmentioning

confidence: 99%

Catalytic performance and structural characterization of ferric oxide and its composite oxides supported gold catalysts for low-temperature CO oxidation

Zhang

Wang

2001

Sc. China Ser. B-Chem.

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The preparation and catalytic activity of ferric oxide and its composite oxides supported gold catalysts for low-temperature CO oxidation were investigated detailedly, and characterized extensively by XRD, XPS, TPR, EC and XAFS techniques. It was found that containing highly dispersed Au of partially oxidized state, these nano-structured oxides supported Au/Fe 2 O 3 and Au/NiFe 2 O 4 catalysts had higher low-temperature activities. The possible catalytic active center is the gold of partially oxidized state (Au ζ+ ). Owing to its chemical inertia and difficulty in dispersion on the supports, gold has long been regarded as a much less active catalyst than platinum group metals. However, recent studies [1][2][3] have clearly shown that gold is extraordinarily active for low-temperature CO oxidation. Supported gold catalysts, such as Au/TiO 2 , Au/MnO x , Au/ZnO, Au/Fe 2 O 3 , Au/Al 2 O 3 and Au/NiFe 2 O 4 , have been identified as promising catalysts used in chemical sensors [4][5][6] , sealed CO 2 lasers [7,8] and air purification devices [9,10] . Some of them are also employed for hydrogen elimination from CO 2 feed gas in urea synthesis [11,12] . These reaction data and applications indicate that Au and support interact synergistically, exhibiting high long-term CO oxidation activity near room temperature. The reason for the enhancement of the catalytic performance of these supported gold catalysts is thought to be related to the CO oxidation reaction mechanism and the structure of gold catalyst, such as gold particle size and chemical state. In order to clarify the mechanism of the catalytic oxidation of CO with O 2 , in situ IR, ESR and TPD-ITD techniques have been used, and some insight into the catalytic mechanism was obtained [13][14][15][16] . Furthermore, some supported gold catalysts such as Au/MnO x , Au/Fe 2 O 3 , Au/Al 2 O 3 , Au/Co 3 O 4 and Au/Mg(OH) 2 were examined using XPS, TEM, XAFS and Mössbauer surface characterization techniques [17][18][19][20][21][22][23] . Relatively little was understood about the possible catalytic active center [24]

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“…Supported gold nanoparticles (Au NPs) have been intensively studied in catalysis [1], particularly for the low-temperature CO oxidation [2][3][4][5][6], water-gas shift (WGS) reaction [7], VOC removal [8], and selective oxidation of organic compounds [9]. It is generally considered that the catalytic activity of Au NPs is strongly dependent on the size (<5 nm) and morphology [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Alumina hollow microspheres supported gold catalysts for low-temperature CO oxidation: effect of the pretreatment atmospheres on the catalytic activity and stability

et al. 2014

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Hierarchically organized γ-Al 2 O 3 hollow microspheres were prepared via a hydrothermal method using potassium aluminum sulfate and urea as reactants. The corresponding Au/Al 2 O 3 catalysts were obtained using a deposition-precipitation (DP) method. The effect of the pretreatment under different atmospheres (N 2 , air, and H 2 ) on the activity and stability of the Au/Al 2 O 3 catalysts in CO oxidation was investigated. The results showed that the pretreatment under H 2 atmosphere improved the low-temperature CO oxidation activity. Furthermore, a 50 h long-term test at 30°C showed no significant deactivation for the H 2 -pretreated catalyst. Moreover, the catalytic activity was promoted by H 2 O vapor in all cases, and the H 2 -pretreated catalyst exhibited a good tolerance in the co-presence of CO 2 and H 2 O. Finally, oxygen temperature-programmed desorption (O 2 -TPD) and in situ diffuse reflectance infrared Fourier transform spectra (DRIFTS) revealed that the reductive atmosphere pretreatment greatly improved the CO adsorption capacity and facilitated the oxygen activation.

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Low-Temperature Oxidation of CO over Gold Supported on TiO2, α-Fe2O3, and Co3O4

Cited by 2,162 publications

References 0 publications

Models for heterogeneous catalysts: studies at the atomic level

Models for heterogeneous catalysts: studies at the atomic level

Catalytic performance and structural characterization of ferric oxide and its composite oxides supported gold catalysts for low-temperature CO oxidation

Alumina hollow microspheres supported gold catalysts for low-temperature CO oxidation: effect of the pretreatment atmospheres on the catalytic activity and stability

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