A simple one pot synthesis of nano gold–mesoporous silica and its oxidation catalysis

Sekhar, Anandakumari C. Sunil; Sivaranjani, Kumarsrinivasan; Gopinath, Chinnakonda S.; Vinod, C. P.

doi:10.1016/j.cattod.2012.05.053

Cited by 29 publications

(16 citation statements)

References 49 publications

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“…Additionally Stucky et al [37] elaborated on the applicability of P123 for the synthesis of different silica film mesophases. The applicability of P123 as a reducing agent under our synthesis conditions as well as a structure directing agent for silica synthesis was reported previously [38]. The solid state UV-Vis analysis of the film coated on a FTO plate gave a small broad peak at 510 nm indicating the formation of small gold nanoparticles within the system (Figure S1).…”

Section: Resultssupporting

confidence: 69%

Gold Incorporated Mesoporous Silica Thin Film Model Surface as a Robust SERS and Catalytically Active Substrate

Sekhar

Vinod

2016

Molecules

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Ultra-small gold nanoparticles incorporated in mesoporous silica thin films with accessible pore channels perpendicular to the substrate are prepared by a modified sol-gel method. The simple and easy spin coating technique is applied here to make homogeneous thin films. The surface characterization using FESEM shows crack-free films with a perpendicular pore arrangement. The applicability of these thin films as catalysts as well as a robust SERS active substrate for model catalysis study is tested. Compared to bare silica film our gold incorporated silica, GSM-23F gave an enhancement factor of 10 3 for RhB with a laser source 633 nm. The reduction reaction of p-nitrophenol with sodium borohydride from our thin films shows a decrease in peak intensity corresponding to -NO 2 group as time proceeds, confirming the catalytic activity. Such model surfaces can potentially bridge the material gap between a real catalytic system and surface science studies.

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Section: Resultssupporting

confidence: 69%

Gold Incorporated Mesoporous Silica Thin Film Model Surface as a Robust SERS and Catalytically Active Substrate

Sekhar

Vinod

2016

Molecules

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“…CO oxidation catalytic evaluation was carried out using fixed bed glass reactor with an outer diameter of 14 mm size. [61] 250 mg of Cu-Ce-Zr catalyst has been loaded in a fixed bed reactor and CO oxidation experiment was measured with 4 % CO and 20 % O 2 containing gas mixture (O 2 /CO/N 2 = 5:1:19) at different temperatures. Flow rate of the gas mixture was maintained at 25 mL min À1 and calculated GHSV was 6000 cm 3 g À1 h À1 .…”

Section: Catalytic Evaluation For Co Oxidationmentioning

confidence: 99%

Role of Nanointerfaces in Cu‐ and Cu+Au‐Based Near‐Ambient‐Temperature CO Oxidation Catalysts

et al. 2014

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Disordered mesoporous Cu‐doped ceria‐zirconia (Cu0.1Ce0.85Zr0.05O2), and gold deposited (Au/Cu0.1Ce0.85Zr0.05O2) catalysts were synthesized and evaluated for CO oxidation. Onset of CO oxidation activity, and 50 % (100 %) CO2 formation occurs at room temperature (RT), and 77 (120)°C, respectively, with Cu0.1Ce0.85Zr0.05O2. A small amount of gold on Cu0.1Ce0.85Zr0.05O2 induces the sustainable oxidation catalysis around RT. Onset of copper reduction temperature decreases from 110 °C on Cu0.1Ce0.85Zr0.05O2 to 48 °C with Au/Cu0.1Ce0.85Zr0.05O2, highlighting the direct interaction between Cu and Au through a Cu–Au interface. Au particles with a (0 0 1) facet deposit on an oxygen‐deficient site of (1 1 1) facet of CeO2‐ZrO2. Any decrease in surface Cu‐content with increasing Au‐content further supports the Au‐Cu‐Ce/Zr interface interactions. Nanointerfaces of Au clusters on Cu next to oxygen‐deficient sites of CeO2‐ZrO2 facilitate all the elementary steps of the CO+O2 reaction to occur in close proximity at ambient conditions.

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“…The larger Au NPs of Au/KCC‐1‐NH 2 ‐b1 were not able to penetrate the pores of KCC‐1 and showed only limited catalytic activity. The catalytic performance displayed by our Au catalysts in the benchmark CO oxidation reaction is lower than that of other highly optimized mesoporous silica based systems (Table ), although it falls in the same range of activity as other mesoporous silica Au based catalysts . Nevertheless, we demonstrate here that the high accessibility of the fibrous KCC‐1 nanospheres, along with a suitable preparation method, affords catalytically active, highly dispersed, narrowly distributed, and tiny (1–2 nm) Au NPs for high noble metal loadings (5–10 %).…”

Section: Discussionmentioning

confidence: 99%

Gold Nanoparticles Supported on Fibrous Silica Nanospheres (KCC‐1) as Efficient Heterogeneous Catalysts for CO Oxidation

et al. 2016

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Gold nanoparticles (Au NPs) of different sizes were supported on fibrous silica nanospheres (KCC‐1) by various methods. The size and the location of the Au NPs on the support were found to depend on the preparation method. The KCC‐1‐supported Au NPs were thoroughly characterized by using HR‐TEM, XRD, X‐ray photoelectron spectroscopy, UV, and Brunauer–Emmett–Teller surface area measurements and were applied in catalysis for the oxidation of CO. The catalytic performance is discussed in relation to the morphological properties of KCC‐1.

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A simple one pot synthesis of nano gold–mesoporous silica and its oxidation catalysis

Cited by 29 publications

References 49 publications

Gold Incorporated Mesoporous Silica Thin Film Model Surface as a Robust SERS and Catalytically Active Substrate

Gold Incorporated Mesoporous Silica Thin Film Model Surface as a Robust SERS and Catalytically Active Substrate

Role of Nanointerfaces in Cu‐ and Cu+Au‐Based Near‐Ambient‐Temperature CO Oxidation Catalysts

Gold Nanoparticles Supported on Fibrous Silica Nanospheres (KCC‐1) as Efficient Heterogeneous Catalysts for CO Oxidation

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