Ordered Nanoporous Silica with Periodic 30−60 nm Pores as an Effective Support for Gold Nanoparticle Catalysts with Enhanced Lifetime

Ma, Guicen; Yan, Xiaoqing; Li, Yunlong; Xiao, Liping; Huang, Zhongli; Lu, Yu; Fan, Jie

doi:10.1021/ja1027524

Cited by 116 publications

(107 citation statements)

References 14 publications

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“…AuNPs with a uniform size of 3.3 ± 0.5 nm were prepared according to our previous method ( Figure S1 in the Supporting Information). 20 They were readily adsorbed onto various supports by colloid deposition, followed by high-temperature thermal treatment. In a typical synthesis of AuCN materials, the supported AuNPs were transferred into a MeCN solution containing a certain amount of benzaldehyde for UV-light irradiation (λ > 300 nm) at room temperature (298 K).…”

Section: Resultsmentioning

confidence: 99%

Radical-Involved Photosynthesis of AuCN Oligomers from Au Nanoparticles and Acetonitrile

Kobayashi

Tong

et al. 2012

J. Am. Chem. Soc.

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We show here the first radical route for the direct photosynthesis of AuCN oligomers with different sizes and shapes, as evidenced by TEM observations, from an Au nanoparticle/benzaldehyde/CH(3)CN ternary system in air under UV-light irradiation. This photochemical route is green, mild, and universal, which makes itself distinguishable from the common cyanidation process. Several elementary reaction steps, including the strong C-C bond dissociation of CH(3)CN and subsequent •CN radical addition to Au, have been suggested to be critical in the formation of AuCN oligomers based on the identification of •CN radical by in situ EPR and the radical trapping technique, and other reaction products by GC-MS and (1)H NMR, and DFT calculations. The resulting solid-state AuCN oligomers exhibit unique spectroscopic characters that may be a result of the shorter Au-Au distances (namely, aurophilicity) and/or special polymer-like structures as compared with gold cyanide derivatives in the aqueous phase. The nanosized AuCN oligomers supported on mesoporous silica showed relatively good catalytic activity on the homogeneous annulation of salicylaldehyde with phenylacetylene to afford isoflavanones employing PBu(3) as the cocatalyst under moderate conditions, which also serves as evidence for the successful production of AuCN oligomers.

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Section: Resultsmentioning

confidence: 99%

Radical-Involved Photosynthesis of AuCN Oligomers from Au Nanoparticles and Acetonitrile

Kobayashi

Tong

et al. 2012

J. Am. Chem. Soc.

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“…Ma et al [159] recently reported the synthesis of gold catalysts supported on extra-large mesoporous silica material (EP-FDU-12), which were active and highly selective in the gas-phase oxidation of benzyl alcohol to benzaldehyde. The EP-FDU-12 support was prepared using Pluronic F127 as template agent and TEOS as silica precursor, in the presence of 1,3,5-trimethylbenzene and KCl.…”

Section: Synthesis By Dispersion Of Gold Colloids or Presynthesized Amentioning

confidence: 99%

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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“…22 For ordered mesoporous materials synthesized at high hydrothermal treatment temperature, it is frequently observed that the pore size determined by nitrogen adsorption is surprisingly larger than the cell parameter, and this phenomenon occurs in not only hexagonal mesostructures 23-25 but also OCMSMs. 7 In the case of hexagonal mesostructures, this observation was explained by the coalescence of adjacent mesopores 26 as confirmed by electron tomography (ET) technique. 25 However, for OCMSMs, this abnormal phenomenon is not well explained, further showing the limitation of nitrogen adsorption analysis in the determination of pore size.…”

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confidence: 94%

“…1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 Introduction Ordered mesoporous materials (pore size in the range of 2-50 nm according to IUPAC classification) have received great scientific and industrial interest due to their large surface area, tunable pore structure as well as potential applications including separation, adsorption, filtration, and catalysis. [1][2][3][4][5][6][7][8][9][10][11] In particular, more attention has been paid to ordered cage-type mesoporous silica materials (OCMSMs) with controlled cages and entrance dimensions, such as SBA-16, FDU-1, KIT-5 and FDU-12, 1,3,8,11 due to their fascinating interconnected threedimensional structures. 2,10 During the last ten years, the synthesis of ordered cage-type mesoporous materials with tailored unit cell sizes, pore sizes and pore connectivity has been well reported.…”

mentioning

confidence: 99%

“…Firstly, the precise control of the pore size distribution in OCMSMs is necessary to achieve the desirable function in a particular application. 7 Secondly, the size and arrangement of the connectivity is critical for those applications requiring mass diffusion and transportation. 1 Thirdly, the shape of the connecting pores is crucial for applications where the final topology is important, such as in the process of growing porous crystals templated by OCMSMs as the hard template.…”

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confidence: 99%

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New Insight into Ordered Cage-Type Mesostructures and Their Pore Size Determination by Electron Tomography

Yuan

Yang²,

Zhang³

et al. 2015

Langmuir

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In this work, a new approach based on electron tomography (ET) has been developed to measure the pore size, through which new insight into cage-type ordered mesostructures and their pore size determination has been obtained. It is demonstrated that the accurate pore diameter, especially for cage-type cubic mesoporous materials, can be determined only through our ET approach by considering that the pore geometry is a real 3D space. We use the established ET method to revisit the applicability of different models for the pore size calculation in nitrogen adsorption analysis. Different from the overwhelming understanding that the nonlocal density functional theory (NLDFT) and Derjaguin-Broekhoff-de Boer (BdB) model are recommended to calculate the pore size of cage-type cubic mesoporous materials while the Barret-Joyner-Halenda (BJH) model should not be used, a new understanding is gained through this study. The choice of a suitable model for pore size determination depends on the precise pore structure. For a cage-type cubic mesoporous material with fcc symmetry and a large entrance connecting the cages, the BJH model is more accurate while the other two methods overestimate the pore size (by up to 40%). The DFT model is more appropriate when the pore shape is a perfect sphere than the BJH model, which underestimates the pore size, and the BdB model, which overestimates the pore size. It is our opinion that the unique ET approach should be used to revisit a vast number of large-pore cubic mesoporous materials to provide genuine structural information.

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Ordered Nanoporous Silica with Periodic 30−60 nm Pores as an Effective Support for Gold Nanoparticle Catalysts with Enhanced Lifetime

Cited by 116 publications

References 14 publications

Radical-Involved Photosynthesis of AuCN Oligomers from Au Nanoparticles and Acetonitrile

Radical-Involved Photosynthesis of AuCN Oligomers from Au Nanoparticles and Acetonitrile

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

New Insight into Ordered Cage-Type Mesostructures and Their Pore Size Determination by Electron Tomography

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