Combustion of CO and Toluene; Characterisation of Copper Oxide Supported on Titania and Activity Comparisons with Supported Cobalt, Iron, and Manganese Oxide

Larsson, Per‐Olof; Andersson, Arne; Wallenberg, L. Reine; Svensson, Bo

doi:10.1006/jcat.1996.0329

Cited by 181 publications

(100 citation statements)

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“…19,21,22 However, studies concerning the low-temperature catalytic combustion of HCVOCs using CuO-CeO 2 have seldom been reported, despite the material being proven to have excellent catalytic activities for the oxidation of many VOC pollutants. 23,24 At present, the primary issues for the oxidation of HCVOCs using transition metal oxides are how to improve the catalytic activity, reaction durability, and thermal stability. Different protocols have been reported for the synthesis of highly efficient transition metal oxide-loaded catalysts in previous studies, such as sol-gel, incipient impregnation, urea-nitrate combustion, coprecipitation, and one-pot polymeric precursors, however, the surface areas and total pore volumes of the obtained catalysts were rather low.…”

Section: Introductionmentioning

confidence: 99%

Facile preparation of 3D ordered mesoporous CuOx–CeO2 with notably enhanced efficiency for the low temperature oxidation of heteroatom-containing volatile organic compounds

Chen

et al. 2013

RSC Adv.

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SBA-16 silica with intact surface hydroxyl groups was quickly obtained (5 min) via a fast-microwaveassisted method, and further adopted as an efficient template for the synthesis of three-dimensional (3D) ordered mesoporous CuO x -CeO 2 catalysts (htpCCx) through a simple and reproducible host-guest interaction. XRD, XPS, H 2 -TPR, and Raman results reveal that many of the Cu 2+ ions in htpCCx are incorporated into the CeO 2 lattice, leading to the formation of a Cu x Ce 12x O 22d solid solution, which produces a large number of oxygen vacancies and enhances the reducibility of the metal. The interaction of Cu and Ce is essential to the reaction as it maintains the Cu 2+ /Cu 1+ and Ce 4+ /Ce 3+ redox couples. The catalyst has a 3D mesostructure and possesses remarkably enhanced low-temperature activity for the combustion of epichlorohydrin. HtpCC20 has been identified as the most powerful catalyst for this reaction, with the reaction rate at 165 uC being about 6.3 and 33.3 times higher than those of catalysts synthesized using conventional incipient impregnation and thermal combustion methods, respectively. Furthermore, htpCC20 shows superior CO 2 selectivity (.99%) and stability (no deactivation occurs after 50 h reaction). It is believed that the dispersion of the active phase, density of surface active oxygen, and lowtemperature reducibility are the dominant factors governing the catalytic performance.

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Section: Introductionmentioning

confidence: 99%

Facile preparation of 3D ordered mesoporous CuOx–CeO2 with notably enhanced efficiency for the low temperature oxidation of heteroatom-containing volatile organic compounds

Chen

et al. 2013

RSC Adv.

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“…[1][2][3][4] The oxides of transition metals are an important class of semiconductors that have wider applications in magnetic storage media, solar energy transformation, electronics, and catalysis. [5][6][7][8][9][10][11][12] Among various transition metal oxides, copper oxide (CuO) has attracted greater attention due to its fascinating properties such as the basis of high critical temperature (T c ) superconductors. CuO is a semiconducting compound with a narrow band gap and is used for photoconductive and photothermal applications.…”

Section: Introductionmentioning

confidence: 99%

Size-dependent antimicrobial properties of CuO nanoparticles against Gram-positive and -negative bacterial strains

Azam

Ahmed²,

Oves³

et al. 2012

IJN

699

237

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Background: CuO is one of the most important transition metal oxides due to its captivating properties. It is used in various technological applications such as high critical temperature superconductors, gas sensors, in photoconductive applications, and so on. Recently, it has been used as an antimicrobial agent against various bacterial species. Here we synthesized different sized CuO nanoparticles and explored the size-dependent antibacterial activity of each CuO nanoparticles preparation. Methods: CuO nanoparticles were synthesized using a gel combustion method. In this approach, cupric nitrate trihydrate and citric acid were dissolved in distilled water with a molar ratio of 1:1. The resulting solution was stirred at 100°C, until gel was formed. The gel was allowed to burn at 200°C to obtain amorphous powder, which was further annealed at different temperatures to obtain different size CuO nanoparticles. We then tested the antibacterial properties using well diffusion, minimum inhibitory concentration, and minimum bactericidal concentration methods. Results: XRD spectra confirmed the formation of single phase CuO nanoparticles. Crystallite size was found to increase with an increase in annealing temperature due to atomic diffusion. A minimum crystallite size of 20 nm was observed in the case of CuO nanoparticles annealed at 400°C. Transmission electron microscopy results corroborate well with XRD results. All CuO nanoparticles exhibited inhibitory effects against both Gram-positive and -negative bacteria. The size of the particles was correlated with its antibacterial activity. Conclusion: The antibacterial activity of CuO nanoparticles was found to be size-dependent. In addition, the highly stable minimum-sized monodispersed copper oxide nanoparticles synthesized during this study demonstrated a significant increase in antibacterial activities against both Gram-positive and -negative bacterial strains.

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“…The oxides of transition metals are an important class of semiconductors, which have applications in magnetic storage media, solar energy transformation, electronics and catal-ysis [1][2][3][4][5][6][7][8][9]. Among the oxides of transition metals, copper oxide nano particles are of special interest because of their efficiency as nanofluids in heat transfer application [10].…”

Section: Introductionmentioning

confidence: 99%

Studies on pure and divalent metal doped copper oxide nanoparticles

Ponnarasan¹,

Krishnan²

2014

astp

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Pure and Ni 2+ doped Copper oxide (CuO) nanoparticles were synthesized by simple solvothermal method. Effect of concentration of the dopant (2.5, 5 7.5 and 10 mole%) on the properties of CuO was analyzed from X-ray diffraction pattern (XRD), SEM, EDAX, UV-VIS, electrical measurements and Photoluminescence spectroscopy . The XRD results clearly indicates that the samples are polycrystalline in nature belongs to hexagonal crystal sturcture and also due to the addition of dopants the average grain size various from 25.14 -17.5nm. The PL results showed that Ni 2+ dopant did not give rise to a new PL signal, but it could improve the intensity of PL spectra with a appropriate Ni 2+ content, which was possibly attributed to the increase in the content of surface oxygen vacancies and defects after doping Ni 2+.

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Combustion of CO and Toluene; Characterisation of Copper Oxide Supported on Titania and Activity Comparisons with Supported Cobalt, Iron, and Manganese Oxide

Cited by 181 publications

References 0 publications

Facile preparation of 3D ordered mesoporous CuOx–CeO2 with notably enhanced efficiency for the low temperature oxidation of heteroatom-containing volatile organic compounds

Facile preparation of 3D ordered mesoporous CuOx–CeO2 with notably enhanced efficiency for the low temperature oxidation of heteroatom-containing volatile organic compounds

Size-dependent antimicrobial properties of CuO nanoparticles against Gram-positive and -negative bacterial strains

Studies on pure and divalent metal doped copper oxide nanoparticles

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