Gold nanoparticles in SBA-15 showing catalytic activity in CO oxidation

Yang, Chia-Min; Kalwei, Martin; Schüth, Ferdi; Chao, Kuei‐Hsiang

doi:10.1016/s0926-860x(03)00490-3

Cited by 193 publications

(136 citation statements)

References 29 publications

Supporting

Mentioning

129

Contrasting

Unclassified

Order By: Relevance

“…An ion-exchange strategy was instead used by Yang et al [36] to adsorb the gold precursor onto a preformed SBA-15 support. The approach involved the functionalization of SBA-15 with a triethoxysilane bearing a quaternary ammonium fragment, which was used to exchange chloride anions with tetrachloroaurate(III) anions.…”

Section: Goldmentioning

confidence: 99%

Embedded Phases: A Way to Active and Stable Catalysts

et al. 2010

View full text Add to dashboard Cite

Industrial catalysts are typically made of nanosized metal particles, carried by a solid support. The extremely small size of the particles maximizes the surface area exposed to the reactant, leading to higher reactivity. Moreover, the higher the number of metal atoms in contact with the support, the better the catalyst performance. In addition, peculiar properties have been observed for some metal/metal oxide particles of critical sizes. However, thermal stability of these nanostructures is limited by their size; smaller the particle size, the lower the thermal stability. The ability to fabricate and control the structure of nanoparticles allows to influence the resulting properties and, ultimately, to design stable catalysts with the desired characteristics. Tuning particle sizes provides the possibility to modulate the catalytic activity. Unique and unexpected properties have been observed by confining/embedding metal nanoparticles in inorganic channels or cavities, which indeed offers new opportunities for the design of advanced catalytic sytems. Innovation in catalyst design is a powerful tool in realizing the goals of more green, efficient and sustainable industrial processes. The present Review focuses on the catalytic performance of noble metal‐ and non precious metal‐based embedded catalysts with respect to traditional impregnated systems. Emphasis is dedicated to the improved thermal stability of these nanostructures compared to conventional systems.

show abstract

Section: Goldmentioning

confidence: 99%

Embedded Phases: A Way to Active and Stable Catalysts

et al. 2010

View full text Add to dashboard Cite

show abstract

“…The preparation of dispersed AuNPs in mesoporous SBA-15 using TPTAC as functionalizing agent has been reported by Yang et al [41,58]. Gold was loaded on the functionalized SBA-15 using HAuCl 4 solution as precursor, and the slurry was chemically reduced with NaBH 4 aqueous solution.…”

Section: Postsynthetic Functionalization Of Msm (Grafting) Before Golmentioning

confidence: 99%

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

2011

View full text Add to dashboard Cite

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.

show abstract

“…Indeed, Fe 2 O 3 , TiO 2 , NiO x , and CoO x have been classified as "active" supports because they are reducible and can activate and store oxygen, whereas Al 2 O 3 and SiO 2 were classified as "inert" supports because they may not be able to supply reactive oxygen for CO oxidation [117]. Nevertheless, Au/Al 2 O 3 [82,109,118,119] and Au/SiO 2 [93,95,[120][121][122][123][124][125] can be active for CO oxidation. For example, Au/SiO 2 prepared via gas-phase grafting of dimethyl gold acetylacetonate exhibited high activity in CO oxidation [120][121][122].…”

Section: Au/siomentioning

confidence: 99%

“…For example, Au/SiO 2 prepared via gas-phase grafting of dimethyl gold acetylacetonate exhibited high activity in CO oxidation [120][121][122]. The grafting of alkylammonium ions [123] or aminosilane [124] onto mesoporous SiO 2 could facilitate the uptake of a gold precursor on the grafted SiO 2 surface, and the resulting catalysts were active for CO oxidation. Alternatively, gold particles capped with alkanethiol and alkoxysilane groups can undergo polymerization with tetraethyl orthosilicate to form an Au/SiO 2 material active for CO oxidation after calcination [125].…”

Section: Au/siomentioning

confidence: 99%

Development of novel supported gold catalysts: A materials perspective

2010

View full text Add to dashboard Cite

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.

show abstract

Gold nanoparticles in SBA-15 showing catalytic activity in CO oxidation

Cited by 193 publications

References 29 publications

Embedded Phases: A Way to Active and Stable Catalysts

Embedded Phases: A Way to Active and Stable Catalysts

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

Development of novel supported gold catalysts: A materials perspective

Contact Info

Product

Resources

About