Aerobic oxidation of cyclohexane by gold nanoparticles immobilized upon mesoporous silica

Zhu, Kake; Hu, Juncheng; Richards, Ryan M.

doi:10.1007/s10562-004-3454-5

Cited by 89 publications

(65 citation statements)

References 21 publications

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“…Moreover, the XPS analysis revealed that AuNPs were present on the catalysts in the metallic Au 0 state. Richards group [57] used APS and MPTS as stabilizing ligands, to immobilize AuNPs into mesoporous SBA-15. The resulting gold catalysts (Au-loading ~4%wt) were highly active for the aerobic oxidation of cyclohexane, and conversions ranging between 21 and 32% after 6 h reaction at 150 °C and 1.5 MPa of oxygen pressure were attained.…”

Section: Postsynthetic Functionalization Of Msm (Grafting) Before Golmentioning

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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Section: Postsynthetic Functionalization Of Msm (Grafting) Before Golmentioning

confidence: 99%

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

2011

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“…Sonstr ö m et al [133] discussed that the ligands could effi ciently modify the metalsupport interaction, and the benefi cial interaction remediated CO poison of the catalyst at low temperatures and, hence, much higher activity. It is worth noting that some well-defi ned support materials have become available, such as the different shapes of TiO 2 nanocrystals [135,136] , highly ordered mesoporous supports of γ -Al 2 O 3 [137] , SiO 2 [138] , aluminosilicate such as MCM-41 [139] , MCM-48 [132] , ZSM-5 [139] , SBA-15 [140] , TS-1 [141] , mesoporous carbon [142] , and so forth. Combining these well-defi ned supports with welldefi ned metal nanoparticles is anticipated to provide new opportunities for in-depth catalytic research.…”

Section: Metal-support Interactionsmentioning

confidence: 99%

The impacts of nanotechnology on catalysis by precious metal nanoparticles

Jin

2012

Nanotechnology Reviews

140

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This review article focuses on the impacts of recent advances in solution phase precious metal nanoparticles on heterogeneous catalysis. Conventional nanometal catalysts suffer from size polydispersity. The advent of nanotechnology has signifi cantly advanced the techniques for preparing uniform nanoparticles, especially in solution phase synthesis of precious metal nanoparticles with excellent control over size, shape, composition and morphology, which have opened up new opportunities for catalysis. This review summarizes some recent catalytic research by using well-defi ned nanoparticles, including shape-controlled nanoparticles, high index-faceted polyhedral nanocrystals, nanostructures of different morphology (e.g., coreshell, hollow, etc.), bi-and multi-metallic nanoparticles, as well as atomically precise nanoclusters. Such well-defi ned nanocatalysts provide many exciting opportunities, such as identifying the types of active surface atoms (e.g., corner and edge atoms) in catalysis, the effect of surface facets on catalytic performance, and obtaining insight into the effects of size-induced electron energy quantization in ultra-small metal nanoparticles on catalysis. With well-defi ned metal nanocatalysts, many fundamentally important issues are expected to be understood much deeper in future research, such as the nature of the catalytic active sites, the metalsupport interactions, the effect of surface atom arrangement, and the atomic origins of the structure-activity and the structure-selectivity relationships.

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“…Moreover, most of these catalysts have been utilized in the presence of a solvent [15,16] and an expensive oxidant [17]. Several catalytic systems, such as FeRu, FeCo nanoclusters, supported Co catalyst, polymer supported cobaltous palmitate, and Co-salen complex immobilized on silica [18], Au/MCM-41 [13], gold nanoparticles immobilized upon mesoporous silica [19], Au nanoclusters on hydroxyapatite [17], metallophthalocyanines supported on -alumina [20], and chromium containing silicate [21], have been devised in solvent-free condition and presence of molecular oxygen. These catalysts in general have limitations of poor catalytic activity, loss of sensitivity, low selectivity, and high cost.…”

Section: Introductionmentioning

confidence: 99%

Tuning of Activated Carbon for Solvent-Free Oxidation of Cyclohexane

Sadiq

Khan

Numan

et al. 2017

Journal of Chemistry

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Activated carbon (AC) was prepared from carbonization of phosphoric acid soaked peanut shell at 380 ∘ C under inert atmosphere followed by activation with hydrogen peroxide. The AC was characterized by SEM, EDX, FTIR, TGA, and BET surface area and pore size analyzer. The potential of AC as a catalyst for solvent-free oxidation of cyclohexane to cyclohexanol and cyclohexanone (the mixture is known as KA oil) in the presence of molecular oxygen at moderate temperature was investigated in a self-designed double-walled three-necked batch reactor. The effect of different reaction parameters/additive was optimized. The maximum productivity value (2.14 mmolg −1 h −1 , without base, and 4.85 mmolg −1 h −1 , with 0.2 mmol NaOH) of the desired product was achieved under optimal reaction parameters: vol 12.5 mL, cat 0.4 g, time 14 h, oxygen flow 40 mL/min (pO 2 760 Torr), stirring 1100 rpm, and temp 75∘ C. The AC shows recyclability for multiple runs without any significant loss in activity. Thus, the AC can be an efficient catalyst, due to low cost, ease of synthesis, easy recovery, nonleaching, and recyclability for multiple uses for the solvent-free oxidation of cyclohexane.

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Aerobic oxidation of cyclohexane by gold nanoparticles immobilized upon mesoporous silica

Cited by 89 publications

References 21 publications

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

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

The impacts of nanotechnology on catalysis by precious metal nanoparticles

Tuning of Activated Carbon for Solvent-Free Oxidation of Cyclohexane

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