Influence of pretreatment atmospheres on the activity of Au/CeO2 catalyst for low-temperature CO oxidation

Ren, Li-Hui; Lu, An‐Hui; Li, Wen‐Cui

doi:10.1016/j.catcom.2011.06.013

Cited by 39 publications

(27 citation statements)

References 22 publications

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“…They suggested that the catalyst pretreated with H 2 had a better catalytic performance since the formed NiO-Au boundaries can provide dual sites for O 2 activation and CO adsorption. Our recent work also confirmed that the pretreatment atmospheres significantly influence the catalytic activity of the Au/CeO 2 catalyst for CO oxidation [26]. The characterization results showed that pretreatment can significantly change the surface interaction between Au species and CeO 2 support.…”

Section: Introductionsupporting

confidence: 73%

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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Section: Introductionsupporting

confidence: 73%

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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“…As shown earlier [1,[7][8][9][10], the most active catalysts are materials in which gold nanoparticles ≤5 nm in size are used as an active phase and metal oxides (TiO 2 , Fe 2 O 3 , СеО 2 , Co 3 O 4 , and others) are used as supports. Of particular interest are solid solutions based on the cubic lattice of ceria.…”

Section: Introductionmentioning

confidence: 93%

“…The most widespread approach is "deposition precipitation" (DP). The size of supported particles depends on many factors: the pH of the medium, the nature of the hydrolyzing agent, and the conditions of heat treatment of the material after impregnation [1,7,8].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, structure, and properties of a Au/MnO x –CeO2 nanocatalyst for low-temperature oxidation of carbon monoxide

et al. 2017

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Abstract⎯We have synthesized Au/MnO x -CeO 2 nanocatalysts for the low-temperature oxidation of carbon monoxide. Gold nanoparticles applied by the deposition precipitation (DP) method were used as an active phase. The composition, structure, and textural characteristics of the materials and the charge state of the components of the catalysts were studied using X-ray diffraction, X-ray photoelectron spectroscopy, highresolution transmission electron microscopy, inductively coupled plasma mass spectrometry, and low-temperature nitrogen adsorption measurements. The carbon monoxide concentration in the catalytic oxidation products was determined by gas chromatography. The influence of calcination temperature on the charge state of the components of the surface layer of Au/ MnO x -CeO 2 and the catalytic activity of the materials was examined. The catalytic activity of the materials was shown to be determined to a significant degree by the Mn 3+ , Au 3+ , and weakly bound oxygen concentrations in the surface layer.

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“…Активные носители, наоборот, способны частично восстанавливаться и поставлять кислород для окисления моно-оксида углерода, обладают избытком электронов, определяющих окислительное со-стояние атома Au. С этой точки зрения выделяются Au-содержащие катализаторы, в которых в качестве носителей выступают CeO 2 [9][10][11][12] . При этом форма на-хождения ZnO существенно влияет на активность катализатора.…”

Section: состав и активность металлических катализаторов окисления моunclassified

“…Частички золота катализатора Au/Al 2 O 3 , обработанного в среде Н 2 , меньше, поэтому он более активен, чем активированный в воздушной среде. Катализатор Au/CeO 2 , обработанный в среде N 2 , демонстрировал 100%-ную степень превращения СО при 120 °С, а обработанный в среде О 2 -при 50 °С [10]. Обращает на себя внимание тот факт, что свежеприготовленный катализатор Au/MgAl-LDHs показал нулевую активность и только после активирования в воз-/MgAl-LDHs показал нулевую активность и только после активирования в воз-MgAl-LDHs показал нулевую активность и только после активирования в воз--LDHs показал нулевую активность и только после активирования в воз-LDHs показал нулевую активность и только после активирования в воз-показал нулевую активность и только после активирования в воз-душной среде при 200 °С в течение двух часов h составляла 100 % [23].…”

Section: состав и активность металлических катализаторов окисления моunclassified

The State and Prospects of Development of Low-Temperature Catalysts for Carbon Monoxide Oxidation of Respiratory Purpose. I Metal Catalysts

Rakitskaya¹,

Kiose²,

Ennan³

et al. 2015

Odesa National University Herald. Chemistry

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Influence of pretreatment atmospheres on the activity of Au/CeO2 catalyst for low-temperature CO oxidation

Cited by 39 publications

References 22 publications

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

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

Synthesis, structure, and properties of a Au/MnO x –CeO2 nanocatalyst for low-temperature oxidation of carbon monoxide

The State and Prospects of Development of Low-Temperature Catalysts for Carbon Monoxide Oxidation of Respiratory Purpose. I Metal Catalysts

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