Journal ArticleDOI
Low-Temperature CO Oxidation over Combustion Made Fe- and Cr-Doped Co3O4 Catalysts: Role of Dopant’s Nature toward Achieving Superior Catalytic Activity and Stability
Tinku Baidya,Toru Murayama,Parthasarathi Bera,Olga V. Safonova,Patrick Steiger,Nirmal Kumar Katiyar,Krishanu Biswas,Masatake Haruta +7 more
TLDR
In this article, two series of Fe-and Cr-doped Co3O4 catalysts were prepared by a single-step solution combustion technique, and the catalytic activity of new materials for low-temperature CO oxidation was correlated to the nature of the dopant.Abstract:
Co3O4 with a spinel structure shows unique activity for CO oxidation at low temperature under dry conditions; however the active surface is not very stable. In this study, two series of Fe- and Cr-doped Co3O4 catalysts were prepared by a single-step solution combustion technique. Fe was chosen because of its redox activity corresponding to the Fe2+/Fe3+ redox couple and compared to Cr, which is mainly stable in the Cr3+ state. The catalytic activity of new materials for low-temperature CO oxidation was correlated to the nature of the dopant. As a function of dopant concentration, the temperature corresponding to the 50% CO conversion (T50) demonstrated significant differences. The maximal activity was achieved for 15% Fe-doped Co3O4 with T50 of −85 °C and remained almost constant up to 25% Fe. In the case of Cr, the activity was observed to be maximum for 7% of Cr with T50 of −42 °C and significantly decreased for higher Cr loadings. Similarly, there was a contrasting behavior in catalyst stability too. 1...read more
Citations
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Effect of Bi-functional Hierarchical Flower-like CoS Nanostructure on its Interfacial Charge Transport Kinetics, Magnetic and Electrochemical Behaviors for Supercapacitor and DSSC Applications.
TL;DR: A binary transition metal sulfide (CoS) is prepared via one-step hydrothermal synthesis and the fabricated asymmetric CoS//AC supercapacitor device delivers an appreciable energy density and power density with excellent cyclic stability over 2000 charge-discharge cycles.
Journal ArticleDOI
Low temperature catalytic combustion of chlorobenzene over cobalt based mixed oxides derived from layered double hydroxides
TL;DR: In this article, the results indicated that the mixed oxides derived from LDHs possessed high specific surface area and uniform morphology, while the elements in the mixture were homogenously dispersed, and the CoCr catalyst possessed the highest activity and more obvious inhibition of dichlorobenzene formation.
Journal ArticleDOI
Nanocrystalline Co3O4 catalysts for toluene and propane oxidation: Effect of the precipitation agent
Weidong Zhang,J. Díez-Ramírez,Paola Anguita,Claude Descorme,José Luis Valverde,Anne Giroir-Fendler +5 more
TL;DR: In this article, a set of cobalt oxide catalysts was prepared via precipitation using various precipitants and evaluated in the total oxidation of toluene and propane, and the results showed that the physicochemical properties and the catalytic performance were greatly influenced by the nature of the precipitation agent used upon preparation.
Journal ArticleDOI
Carbonate-mediated Mars–van Krevelen mechanism for CO oxidation on cobalt-doped ceria catalysts: facet-dependence and coordination-dependence
TL;DR: Atomic-scale insights are provided into the reaction mechanism involving carbonate intermediates and the structure-mechanism relationship for CO oxidation over cobalt-ceria catalysts and the results indicate that the coordination environment of the dopant species is a key factor that determines the carbonate-mediated M-vK mechanism.
Journal ArticleDOI
Construction of a high-performance photocatalytic fuel cell (PFC) based on plasmonic silver modified Cr-BiOCl nanosheets for simultaneous electricity production and pollutant removal
TL;DR: Experimental results revealed that the Cr doping and Ag modification could not only extend the photo absorption of BiOCl from the UV to the visible light region but could also greatly increase the generation and transfer rate of charge carriers because of its narrowed band gap and the localized surface plasmon resonance (LSPR) effect of metallic Ag.
References
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Journal ArticleDOI
ATHENA, ARTEMIS, HEPHAESTUS: data analysis for X-ray absorption spectroscopy using IFEFFIT.
Bruce Ravel,Matthew Newville +1 more
TL;DR: A software package for the analysis of X-ray absorption spectroscopy (XAS) data is presented, based on the IFEFFIT library of numerical and XAS algorithms and is written in the Perl programming language using the Perl/Tk graphics toolkit.
Journal ArticleDOI
Gold catalysts prepared by coprecipitation for low-temperature oxidation of hydrogen and of carbon monoxide
TL;DR: In this paper, gold catalysts were prepared by coprecipitation from an aqueous solution of HAuCl4 and the nitrates of various transition metals, including Auα-Fe2O3, AuCo3O4, and AuNiO.
Journal ArticleDOI
Novel Gold Catalysts for the Oxidation of Carbon Monoxide at a Temperature far Below 0 °C
TL;DR: In this article, a variety of gold catalysts are used to catalyze the oxidation of carbon monoxide at temperatures as low as −70 °C and are stable in a moistened gas atmosphere.
Journal ArticleDOI
The impact of nanoscience on heterogeneous catalysis
TL;DR: Advances in characterization methods have led to a molecular-level understanding of the relationships between nanoparticle properties and catalytic performance, and this knowledge is contributing to the design and development of new catalysts.
Journal ArticleDOI
Low-temperature oxidation of CO catalysed by Co 3 O 4 nanorods
TL;DR: Tricobalt tetraoxide nanorods not only catalyse CO oxidation at temperatures as low as –77 °C but also remain stable in a moist stream of normal feed gas, showing the importance of morphology control in the preparation of base transition-metal oxides as highly efficient oxidation catalysts.