Catalytic decomposition of N2O over CeO2 promoted Co3O4 spinel catalyst

Xue, Lixin; Zhang, Changbin; He, Hong; Teraoka, Yasutake

doi:10.1016/j.apcatb.2007.04.013

Cited by 472 publications

(285 citation statements)

References 40 publications

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“…Moreover, as it can be seen from Figure 6 the slope that addressed the sensitivity of the CME was found to be 52 mV/decade. The lower LOD, wide range of detection and a good sensitivity of the presented CMEs are attributed to the high surface-to-volume ratio of the Co3O4 nanowires and their better electro-catalytic properties [41]. On the other hand, these results might be connected to the presence of the surfactant as have been suggested in [24].…”

Section: Electrochemical Measurementscontrasting

confidence: 39%

Dopamine wide range detection sensor based on modified Co3O4 nanowires electrode

Elhag

Ibupoto

Liu

et al. 2014

Sensors and Actuators B: Chemical

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Ultra-thin cobalt oxide (Co3O4) nanowires grown on gold coated glass substrates by the hydrothermal chemical deposition and have been used as a wide range dopamine potentiometric sensor. An anionic surfactant (sodium dodecylbenzenesulfonate) was used to achieve assisted growth procedure. Moreover, a polymeric membrane containing polyvinyl chloride as plasticized polymer, β-cyclodextrin as ionophore, and potassium tetrakis (4-chlorophenyl) borate as ionic additive were immobilized on the Co3O4 nanostructures through electrostatic adsorption method. X-ray diffraction, x-ray photoelectron spectroscopy, and scanning electron microscopy were used to characterize the electrodes while ultravioletvisible absorption was used to investigate the band gap of the Co3O4 nanostructures. The structural characterization showed a cubic crystalline, pure phase, and nanowires morphology of the Co3O4. However, the morphology is altered when the surfactant concentration has been changed. The Co3O4 chemical modified electrodes were used in potentiometric measurements for dopamine in a 10 −2 M acetic acid/sodium acetate solution having a pH of 5.45. For dopamine range from 10 -9 M to 10 -2 M, the potential response of the sensor electrode was linear with a slope of 52mV/decade. The wide range and high sensitivity of the modified Co3O4 nanowires based sensor for dopamine is attributed to the defects on the metal oxide that is dictated by the used surfactant along with the high surface area-to-volume ratio.

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Section: Electrochemical Measurementscontrasting

confidence: 39%

Dopamine wide range detection sensor based on modified Co3O4 nanowires electrode

Elhag

Ibupoto

Liu

et al. 2014

Sensors and Actuators B: Chemical

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“…Recently, Russo et al [12], who tested various spinel systems, reported high catalytic activity of MgCo 2 O 4 and ZnCo 2 O 4 spinels, which were more catalytically active than Co 3 O 4 . The activation effect of the CeO 2 addition in Co 3 O 4 spinel was shown by Xue et al [13]. The best catalytic results were obtained for the molar ratio of Ce/Co around 0.05.…”

Section: Introductionmentioning

confidence: 78%

“…Promotion effect of potassium on decomposition of N 2 O over various metal oxide catalysts was reported in literature. Xue et al [13] explained the increased activity of the potassium-doped case authors suggest that potassium promotes mainly reoxidation of Co 2? to Co 3?…”

Section: Catalytic Testsmentioning

confidence: 99%

An influence of thermal treatment conditions of hydrotalcite-like materials on their catalytic activity in the process of N2O decomposition

Chmielarz

Rutkowska

Kuśtrowski

et al. 2011

J Therm Anal Calorim

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Hydrotalcite-like materials containing apart from magnesium and aluminum also copper, cobalt, nickel, and iron were prepared by a co-precipitation method. Thermal transformations of hydrotalcite-like materials were studied by thermal analysis methods as well as XRD, UV-vis-DRS, and XPS measurements of the samples calcined at various temperatures (600, 700, and 800°C). Calcined hydrotalcites, especially those containing cobalt and copper, were found to be active and selective catalysts of N 2 O decomposition. It was shown that an increase in the calcination temperature significantly activated the Co-containing catalysts. Promotion of the samples with potassium resulted in activation of the hydrotalcite-based catalysts.

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“…Subsequently, the promotion effect of K was found to be more significant than ceria (15,16). Here, the influence of alkali metal additives on the chemistry environments of Co ions may be an important reason for their high activities.…”

Section: Catalytic Activity Measurementsmentioning

confidence: 99%

Promotion Effects and Mechanism of Alkali Metals and Alkaline Earth Metals on Cobalt−Cerium Composite Oxide Catalysts for N₂O Decomposition

Xue

Liu

et al. 2009

Environ. Sci. Technol.

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125

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A series of alkali metal-and alkaline earth metal-doped cobalt-cerium composite oxide catalysts were prepared by the citrate method and tested for the decomposition of N 2 O. Strong promotion effects of alkali and alkaline earth metals on the activity of the catalyst were obtained in the order Li < Na < K < Rb < Cs and Mg < Ca < Sr, Ba. The promotion effects of alkaline earth metals were much weaker than the effects of alkali metals. To investigate the origin of the promotion effect, X-ray diffraction, Brunauer-Emmett-Teller surface area measurement, X-ray photoelectron spectroscopy, temperature-programmed desorption, and hydrogen temperatureprogrammed reduction methods were used to characterize the alkali metal-doped catalyst. The analytical results indicated that alkali metals improved the redox ability of active site Co 2+ by acting as electronic promoters. Catalytic decomposition of N 2 O proceeds through an oxidation-reduction mechanism with participation of electrons from Co 2+ , thus the increase in the redox ability of Co 2+ should lead to an increase in the activity of the catalyst.

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Catalytic decomposition of N2O over CeO2 promoted Co3O4 spinel catalyst

Cited by 472 publications

References 40 publications

Dopamine wide range detection sensor based on modified Co3O4 nanowires electrode

Dopamine wide range detection sensor based on modified Co3O4 nanowires electrode

An influence of thermal treatment conditions of hydrotalcite-like materials on their catalytic activity in the process of N2O decomposition

Promotion Effects and Mechanism of Alkali Metals and Alkaline Earth Metals on Cobalt−Cerium Composite Oxide Catalysts for N₂O Decomposition

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Catalytic decomposition of N2O over CeO2 promoted Co3O4 spinel catalyst

Cited by 472 publications

References 40 publications

Dopamine wide range detection sensor based on modified Co3O4 nanowires electrode

Dopamine wide range detection sensor based on modified Co3O4 nanowires electrode

An influence of thermal treatment conditions of hydrotalcite-like materials on their catalytic activity in the process of N2O decomposition

Promotion Effects and Mechanism of Alkali Metals and Alkaline Earth Metals on Cobalt−Cerium Composite Oxide Catalysts for N2O Decomposition

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Product

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Promotion Effects and Mechanism of Alkali Metals and Alkaline Earth Metals on Cobalt−Cerium Composite Oxide Catalysts for N₂O Decomposition