Preparation of Highly Active Silica-Supported Au Catalysts for CO Oxidation by a Solution-Based Technique

Zhu, Haoguo; Liang, Chengdu; Yan, Wenfu; Overbury, Steven H.; Dai, Sheng

doi:10.1021/jp060637q

Cited by 199 publications

(160 citation statements)

References 39 publications

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“…Although this precursor has not been widely used, the catalysts prepared using Au(en) 2 Cl 3 have displayed not only small and well dispersed AuNPs, but also high catalytic activities in both gas and liquid phase oxidation reactions [44,132].…”

Section: Discussionmentioning

confidence: 99%

“…Based on this principle, the synthesis of Au/MSM catalysts becomes easier by deposition-precipitation of this gold complex, given that in alkaline media the negative-charged surface of the MSM can readily adsorb the [Au(en) 2 ] 3+ cations, by deprotonation reaction of ethylenediamine ligands [128]. Dai and coworkers [44,129] synthesized gold catalysts supported on mesoporous SBA-15 by mixing the support with an aqueous solution of [Au(en) 2 ]Cl 3 in alkaline media (pH range between 6.0 and 10.0). After agitation of the slurry for 2 h, the yellowish solid was filtrated, vacuum dried and reduced under H 2 /Ar (4%) at 150 °C for 1 h. This procedure led to obtain small (~4.9 nm) and uniform AuNPs confined within the SBA-15 mesopores.…”

Section: Synthesis Of Au/msm Using Cationic Gold Complexmentioning

confidence: 99%

“…The most used methods for preparing Au/MSM catalysts include the modification of the MSM support with organic functional groups by post-grafting or co-condensation before gold loading [41,42], one-pot synthesis by the incorporation of both gold and the coupling agent containing functional groups into the MSM synthesis [43], the use of cationic gold complexes such as [Au(en) 2 ]Cl 3 (en = ethylenediamine) [44], chemical vapor deposition using expensive organometallic gold precursors [45], synthesis of the MSM in the presence of gold colloids [46,47], dispersion of gold colloids protected by ligands or polymers onto SiO 2 [46,47], and modification of the mesoporous SiO 2 supports with other metal oxides, such as TiO 2 , Al 2 O 3 and CeO 2 to prepare SiO 2 -based gold catalysts [48,49].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Gold Catalysts Supported on Mesoporous Silica Materials: Recent Developments

2011

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Mesoporous silica materials (MSM) with ordered and controllable porous structure, high surface area, pore volume and thermal stability are very suitable catalyst supports, because they provide high dispersion of metal nanoparticles and facilitate the access of the substrates to the active sites. Since the conventional wet-impregnation and deposition-precipitation methods are not appropriate for the incorporation of gold nanoparticles (AuNPs) into MSM, considerable efforts have been made to develop suitable methods to synthesize Au/MSM catalysts, because the incorporation of AuNPs into the channel system can prevent their agglomeration and leaching. In this review, we summarize the main methods to synthesize active gold catalysts supported on MSM. Examples and details of the preparative methods, as well as selected applications are provided. We expect this article to be interesting to researchers due to the wide variety of chemical reactions that can be catalyzed by gold supported catalysts.

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Section: Discussionmentioning

confidence: 99%

Section: Synthesis Of Au/msm Using Cationic Gold Complexmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis of Gold Catalysts Supported on Mesoporous Silica Materials: Recent Developments

2011

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“…Our group prepared Au/mesoporous SiO 2 (Au/SBA-15 and Au/MCM-41) catalysts using Au(en) 2 Cl 3 (en = ethylenediamine) as the precursor (Fig. 1) [75,83]. The same precursor has also been used by others to prepare Au/NaHY [126], Au/TiO 2 [35], Au/C [127], and Au/clay mineral [128] catalysts.…”

Section: Au/siomentioning

confidence: 99%

Development of novel supported gold catalysts: A materials perspective

2010

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Since Haruta et al. discovered that small gold nanoparticles finely dispersed on certain metal oxide supports can exhibit surprisingly high activity in CO oxidation below room temperature, heterogeneous catalysis by supported gold nanoparticles has attracted tremendous attention. The majority of publications deal with the preparation and characterization of conventional gold catalysts (e.g., Au/TiO 2 ), the use of gold catalysts in various catalytic reactions, as well as elucidation of the nature of the active sites and reaction mechanisms. In this overview, we highlight the development of novel supported gold catalysts from a materials perspective. Examples, mostly from those reported by our group, are given concerning the development of simple gold catalysts with single metal-support interfaces and heterostructured gold catalysts with complicated interfacial structures. Catalysts in the first category include active Au/SiO 2 and Au/metal phosphate catalysts, and those in the second category include catalysts prepared by pre-modification of supports before loading gold, by post-modification of supported gold catalysts, or by simultaneous dispersion of gold and an inorganic component onto a support. CO oxidation has generally been employed as a probe reaction to screen the activities of these catalysts. These novel gold catalysts not only provide possibilities for applied catalysis, but also furnish grounds for fundamental research.

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“…This carboxylate binds with a superoxide and forms CO 2 [61]. As more evidence keeps accumulating on the high CO oxidation activity of gold nanoparticles on any oxide support, including a recent study on SiO 2 [62] and even on non-oxide supports [16], the mechanistic options appear to zero in to highly defective gold clusters independent of the support. [22,23].…”

Section: Co Oxidation On Au/fe 2 Omentioning

confidence: 99%

Comparison of the activity of Au/CeO2 and Au/Fe2O3 catalysts for the CO oxidation and the water-gas shift reactions

et al. 2007

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We compare the activity and relevant gold species of nanostructured gold-cerium oxide and gold-iron oxide catalysts for the CO oxidation by dioxygen and water. Well dispersed gold nanoparticles in reduced form provide the active sites for the CO oxidation reaction on both oxide supports. On the other hand, oxidized gold species, strongly bound on the support catalyze the water-gas shift reaction. Gold species weakly bound to ceria (doped with lanthana) or iron oxide can be removed by sodium cyanide at pH ‡12. Both parent and leached catalysts were investigated. The activity of the leached gold-iron oxide catalyst in CO oxidation is approximately two orders of magnitude lower than that of the parent material. However, after exposure to H 2 up to 400°C gold diffuses out and is in reduced form on the surface, a process accompanied by a dramatic enhancement of the CO oxidation activity. Similar results were found with the gold-ceria catalysts. On the other hand, pre-reduction of the calcined leached catalyst samples did not promote their water-gas shift activity. UV-Vis, XANES and XPS were used to probe the oxidation state of the catalysts after various treatments.

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Preparation of Highly Active Silica-Supported Au Catalysts for CO Oxidation by a Solution-Based Technique

Cited by 199 publications

References 39 publications

Synthesis of Gold Catalysts Supported on Mesoporous Silica Materials: Recent Developments

Synthesis of Gold Catalysts Supported on Mesoporous Silica Materials: Recent Developments

Development of novel supported gold catalysts: A materials perspective

Comparison of the activity of Au/CeO2 and Au/Fe2O3 catalysts for the CO oxidation and the water-gas shift reactions

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