On the Catalytic Activity of Co3O4 in Low-Temperature CO Oxidation

Jansson, Jonas; Palmqvist, Anders; Fridell, Erik; Skoglundh, Magnus; Österlund, Lars; Thormählen, Peter; Langer, Vratislav

doi:10.1006/jcat.2002.3738

Cited by 150 publications

(217 citation statements)

References 36 publications

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“…However, when the temperature rose above 50°C, the 5Co/Si C400 catalyst lost its activity and then, the activity recovered as the temperature rises to 100°C. From TPO experiments, Jansson et al [22] suggests that the presence of carbonates and surface carbon can deactivate the catalyst. This phenomenon can be eliminated by the regeneration of the deactivated catalyst in 10% O 2 /Ar atmosphere.…”

Section: Catalytic Activities Towards the Co Oxidationmentioning

confidence: 99%

“…Therefore, surface carbonates are regarded as intermediates [19,20]. However, others suggest that the high thermal stability of surface carbonates can deactivate the catalyst [21,22], thus raising doubt about their role as intermediates. In order to understand the relationship of formation of various surface species, in this study, in situ FT-IR has been used to demonstrate how CO reacts on the surface of supported cobalt catalysts.…”

Section: Introductionmentioning

confidence: 99%

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In situ FT-IR Spectroscopic Studies on the Mechanism of the Catalytic Oxidation of Carbon Monoxide over Supported Cobalt Catalysts

et al. 2006

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Three types of supported cobalt catalysts (5% as metal Co loading on SiO 2 , Al 2 O 3 and TiO 2 ) were prepared by incipient wetness impregnation with aqueous Co(NO 3 ) 2 AE 6H 2 O solution. Then, all catalysts were calcined in air at 400°C (assigned as 5Co/Si C400, 5Co/Al C400 and 5Co/Ti C400). Their catalytic activities towards the CO oxidation were studied in a continuous flow microreactor. Adsorption of carbon monoxide (CO) and the co-adsorption of CO/O 2 over cobalt oxide were further tested under in situ FT-IR. The results showed that both 5Co/Si C400 and 5Co/Al C400 had higher activity than 5Co/Ti C400. The T 50 (50% conversion) for both 5Co/Si C400 and 5Co/Al C400 was reached at temperatures as low as ambient temperature. According to the in situ FT-IR analysis, the variation in oxidation of CO was interpreted with different mechanisms, i.e., the reaction between adsorbed CO and lattice oxygen of cobalt oxide, and part of CO 2 formation via carbonates on 5Co/Si C400; both types of carbonates are formed on 5Co/Al C400 to promote the CO oxidation; while both strong adsorption of CO on TiO 2 and CO 2 on cobalt oxide for 5Co/Ti C400 leads to affect the activity.

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Section: Catalytic Activities Towards the Co Oxidationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In situ FT-IR Spectroscopic Studies on the Mechanism of the Catalytic Oxidation of Carbon Monoxide over Supported Cobalt Catalysts

et al. 2006

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“…The latter, is the most functional material used for many applications including energy storage, 73 heterogeneous catalysts, 74 electrochromic devices, 75 sensors 76 and recently in overall water-splitting. 77 Due it's potentials as a robust solar selective absorber it has been employed for efficient water splitting.…”

Section: Cobalt Oxide (Co3o4)mentioning

confidence: 99%

“…Co3O4 has a paramount electro-catalytic activity 74 [84][85][86] Typically, they are prepared by solid-state reactions that involves high-temperature (> 700 C) which are considered to be expensive and environmentally unfavorable. Furthermore, the products may contain undesirable phases, which are usually inhomogeneous with regard to large particle size and can be characterized by low surface area that is unfavorable in the photocatalysis.…”

Section: Cobalt Oxide (Co3o4)mentioning

confidence: 99%

Chemically Modified Metal Oxide Nanostructures Electrodes for Sensing and Energy Conversion

Elhag¹

2017

Linköping Studies in Science and Technology. Dissertations

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“…Among these metal oxide nanostructures is cobalt oxide (Co3O4) also called tricobalt tetroxide and cobaltosic oxide [14]. Co3O4 has been commonly used in energy storage [15] heterogeneous catalysts [16], sensor [17], and electrochromic devices [18]. Co3O4 is a p-type and is magnetic semiconductor material has both direct and indirect band gaps of 2.10 eV and 1.60 eV, respectively [19].…”

Section: Introductionmentioning

confidence: 99%

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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On the Catalytic Activity of Co3O4 in Low-Temperature CO Oxidation

Cited by 150 publications

References 36 publications

In situ FT-IR Spectroscopic Studies on the Mechanism of the Catalytic Oxidation of Carbon Monoxide over Supported Cobalt Catalysts

In situ FT-IR Spectroscopic Studies on the Mechanism of the Catalytic Oxidation of Carbon Monoxide over Supported Cobalt Catalysts

Chemically Modified Metal Oxide Nanostructures Electrodes for Sensing and Energy Conversion

Dopamine wide range detection sensor based on modified Co3O4 nanowires electrode

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