Activity of Au/ZnO catalysts prepared by photo-deposition for the preferential CO oxidation in a H2-rich gas

Dulnee, Siriwan; Luengnaruemitchai, Apanee; Wanchanthuek, Ratchaneekorn

doi:10.1016/j.ijhydene.2014.02.038

Cited by 25 publications

(19 citation statements)

References 41 publications

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“…Since Au/ZnO is also a catalyst active in oxidation reactions, and especially in CO oxidation [6][7][8][9][10] , calcined Au/ZnO and reduced Au/ZnO were also tested in this reaction at RT ( Figure 4). In both cases, the catalyst was active, but the reduced one ( Figure 4Aa) was found twice as less active as the oxidised one ( Figure 4Ba).…”

Section: Catalytic Behaviour In Hydrogenation Of 13-butadienementioning

confidence: 99%

“…In these papers, gold nanoparticles (NPs) were supported on different oxide supports, and Au/ZnO was found to provide the best performances. Au/ZnO has been also reported as an efficient catalyst for methanol steam reforming for hydrogen and CO 2 production 4 , for carbon monoxide hydrogenation into methanol 5 , for CO oxidation [6][7][8] and for CO oxidation in excess of H 2 (PROX reaction) [9][10] . Moreover, Au/ZnO has been also used as photocatalysts under UV and/or visible irradiation for photodegradation of dyes in liquid phase [11][12][13] , and of benzene in gas phase 14 .…”

Section: Introductionmentioning

confidence: 99%

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Unusual behaviour of Au/ZnO catalysts in selective hydrogenation of butadiene due to the formation of a AuZn nanoalloy

Derrouiche

Fontaine

Thrimurtulu

et al. 2016

Catal. Sci. Technol.

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Section: Catalytic Behaviour In Hydrogenation Of 13-butadienementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Unusual behaviour of Au/ZnO catalysts in selective hydrogenation of butadiene due to the formation of a AuZn nanoalloy

Derrouiche

Fontaine

Thrimurtulu

et al. 2016

Catal. Sci. Technol.

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“…[33][34][35] For Au/FAU-p,t he reduction peak was observed at 180 8C, which corresponds to the reduction of Au 3+ + to Au 0 . [36,37] ForA u-Zr/ FAU-p,t wo main peaks that correspond to the reductiono f cationic Au speciest om etal at low temperature and that of Zr 4+ + to Zr 3+ + at high temperature were observed in the TPR profile. Both peaks shifted to lower temperatures,w hich shows the synergetic effect between Au and Zr that improves the reducibility of the Au catalyst.…”

Section: Structural and Morphological Characterization Of Membranesmentioning

confidence: 96%

Hollow‐Fiber‐Supported Gold and Zirconium‐Doped Faujasite Catalytic Membranes for Hydrogen Purification

et al. 2017

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Hollow‐fiber‐supported Au‐Zr/faujasite (FAU, NaY) catalytic membranes were prepared and used as a flow‐through catalytic membrane reactor for CO preferential oxidation (CO‐PROX) in H2‐rich gas. The catalytic membranes were prepared by the modification of FAU zeolite membranes with Zr4+ and Au3+ by ion‐exchange, then activation. The obtained catalytic membranes were characterized by using TEM, X‐ray photoelectron spectroscopy, temperature‐programmed reduction, and temperature‐programmed desorption and their catalytic activity toward CO‐PROX was tested. The results showed that the activation conditions affected the size and oxidation states of the resulting Au nanoparticles strongly, and therefore, affected the catalytic activity strongly. The catalytic activity of the Au nanoparticles can be improved by the doping of Zr to form surface oxygen vacancies and the synergetic effect of Au‐Zr. Meanwhile, the presence of the zeolite framework allows the stabilization of small Au nanoparticles. The Au‐Zr/FAU catalytic membrane prepared under the optimized conditions showed a high catalytic performance (CO conversion above 95 %, turnover frequency>0.4 s−1) and outstanding stability (up to 450 h) below 80 °C, which made it a promising candidate for H2 purification.

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“…An enhancement in reactivity was, for the first time, observed for water splitting on Pt/TiO 2 systems [ 19 , 20 ] . With a view to develop industrially scalable processes, Au NPs are also presented as a promising alternative to obtain highly active photocatalysts when operating at mild conditions (atmospheric pressure and temperature between 30 and 200 °C) [ 21 , 22 ]. Furthermore, gold can form alloys with different metals, improving its photocatalytic properties and showing, in oxidation processes, a mechanism similar to monometallic NPs deposited on TiO 2 , but enhancing the synergistic effects [ 23 ] .…”

Section: Introductionmentioning

confidence: 99%

Au and AuCu Nanoparticles Supported on SBA-15 Ordered Mesoporous Titania-Silica as Catalysts for Methylene Blue Photodegradation

et al. 2018

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The photocatalytic degradation of methylene blue (MB) dye has been performed under UV irradiation in aqueous suspension, employing photocatalysts based on Au (1.5 wt %) and AuCu (Au/Cu = 1, 2.0 wt %), and supported on SBA-15-ordered mesoporous silica, with and without titania (Si/Ti = 3), in order to evaluate the versatility of this mesoporous support in this type of reaction of great impact from the environmental point of view. Samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), N2 adsorption-desorption at −196 °C, and X-ray photoelectron spectroscopy (XPS), so as to study their structural, optical, and chemical properties. All the prepared catalysts were found to be active in the test reaction. The bimetallic AuCu-based catalysts attained very high MB degradation values, in particular AuCu/SBA-15 titania-silica sample reached 100% of dye oxidation after the monitored reaction period (120 min).

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Activity of Au/ZnO catalysts prepared by photo-deposition for the preferential CO oxidation in a H2-rich gas

Cited by 25 publications

References 41 publications

Unusual behaviour of Au/ZnO catalysts in selective hydrogenation of butadiene due to the formation of a AuZn nanoalloy

Unusual behaviour of Au/ZnO catalysts in selective hydrogenation of butadiene due to the formation of a AuZn nanoalloy

Hollow‐Fiber‐Supported Gold and Zirconium‐Doped Faujasite Catalytic Membranes for Hydrogen Purification

Au and AuCu Nanoparticles Supported on SBA-15 Ordered Mesoporous Titania-Silica as Catalysts for Methylene Blue Photodegradation

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