Journal ArticleDOI
Fourier-transform infrared study of the surface properties of cobalt oxides
Reads0
Chats0
TLDR
The surface properties of cobalt oxide after two different pretreatments have been investigated by means of Fourier transform infrared (FTIR) spectroscopy of adsorbed carbon monoxide, methanol and ammonia as mentioned in this paper.Abstract:
The surface properties of cobalt oxide after two different pretreatments have been investigated by means of Fourier-transform infrared (FTIR) spectroscopy of adsorbed carbon monoxide, methanol and ammonia. The surface of evacuated Co3O4 exposes CO3+ cations that react rapidly with CO, producing Co2+ and probably CO+, together with carbonate ions. This surface is extremely reactive, and decomposes at room temperature both ammonia and methanol. After mild reduction in hydrogen, CoO is produced. After this treatment the surface exposes Co2+ and even more reduced sites that by contact with CO give small polycarbonyl clusters. This surface adsorbs methanol dissociatively and ammonia molecularly at room temperature.read more
Citations
More filters
Book ChapterDOI
Characterization of oxide surfaces and zeolites by carbon monoxide as an IR probe molecule
TL;DR: In this article, a review of the data characterizing CO adsorption on surface cationic sites of oxides including supported materials and microporous and mesoporous materials is presented.
Journal ArticleDOI
The surface acidity of solid oxides and its characterization by IR spectroscopic methods. An attempt at systematization
TL;DR: In this article, the bases of IR spectroscopic methods for the characterization of the surface acidity, of the Lewis type and of the Bronsted type, of solid, simple and mixed oxides are briefly reviewed.
Journal ArticleDOI
On the Catalytic Activity of Co3O4 in Low-Temperature CO Oxidation
Jonas Jansson,Anders Palmqvist,Erik Fridell,Magnus Skoglundh,Lars Österlund,Peter Thormählen,Vratislav Langer +6 more
TL;DR: In this article, the deactivation of a catalyst in CO over Co3O4 at ambient temperature was studied with flow reactor experiments, and in-situ spectroscopic and structural methods.
Journal ArticleDOI
Characterization of Bulk and Surface Composition of CoxNi1-xOy Mixed Oxides for Electrocatalysis
Yu. E. Roginskaya,O. V. Morozova,E. N. Lubnin,Yu. E. Ulitina,G. V. Lopukhova,Stefano P. Trasatti +5 more
TL;DR: In this article, the surface chemical composition, the crystalline structure, and the oxidation state of Co and Ni in the bulk as well as on the surface were characterized by X-ray diffraction (XRD), infrared spectroscopy (IRS).
Journal ArticleDOI
An FT-IR study of ammonia adsorption and oxidation over anatase-supported metal oxides
TL;DR: In this paper, the adsorption and the oxidation of ammonia over sub-monolayer TiO2-anatase supported chromium, manganese, iron, cobalt, nickel and copper oxides, has been investigated using FT-IR spectroscopy.
References
More filters
Journal ArticleDOI
Electrocatalysis in the anodic evolution of oxygen and chlorine
TL;DR: In this paper, it is shown that the temperature of preparation affects the catalytic activity through the surface area and the chemical composition (non-stoichiometry), and the co-variation of these parameters is best followed in situ by voltammetric curves and point of zero charge measurements.
Journal ArticleDOI
Temperature-programmed reduction of CoOAI2O3 catalysts
P. Arnoldy,Jacob A. Moulijn +1 more
TL;DR: In this article, it was shown that temperature-programmed reduction (TPR) is a sensitive technique for the characterization of Co and Co-Aloxidic phases in CoOAl2O3 catalysts.
Journal ArticleDOI
Electrocatalytic properties of transition metal oxides for oxygen evolution reaction
Y. Matsumoto,E. Sato +1 more
TL;DR: In this article, the mechanisms of the oxygen evolution reaction and the electrical properties of the oxides are simultaneously discussed, and it is suggested that some assumptions used in the deduction of the mechanism from the reaction parameters may not always correct, especially in the potential distribution in the interface between the electrode and the electrolyte.
Journal ArticleDOI
FT-IR study of the adsorption and transformation of formaldehyde on oxide surfaces
TL;DR: The adsorption of formaldehyde on different oxides (silica, pure and fluorided alumina, magnesia, titania, thoria, zirconia, and iron oxide) has been studied by FT-IR spectroscopy in the temperature range 170-570 K as mentioned in this paper.
Journal ArticleDOI
Metal oxides as heterogeneous catalysts for oxygen evolution under photochemical conditions
TL;DR: In this paper, the most efficient catalysts were found to be IrO2, Co3O4, RuO2 and NiCo2O4 and Mn2O3 for the fourelectron oxidation of water to O2 under photochemical conditions.