Effect of thermal treatment on physicochemical properties of pure and mixed manganese carbonate and basic copper carbonate

Shaheen, W.M.; Selim, M.M.

doi:10.1016/s0040-6031(98)00486-9

Cited by 66 publications

(40 citation statements)

References 10 publications

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“…However, increase in the calcination temperature beyond an optimum temperature leads to a decrease in the degree of crystallinity of the CuO phase. This may be attributed to the partial reduction of bivalent copper oxide into amorphous monovalent cuprous oxides according to [26]:…”

Section: Measurementsmentioning

confidence: 99%

Characterization of CuO phase in SnO2–CuO prepared by the modified Pechini method

Majid

Tunney

Argue

et al. 2009

J Sol-Gel Sci Technol

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The modified Pechini method has been applied to the preparation of nano-structured SnO 2 and SnO 2 :CuO. The sample characterization was carried out by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), infrared spectroscopy (IR) and nitrogen adsorption isotherms (BET). The CuO phase in SnO 2 :CuO samples was successfully characterized by XRD, XPS and IR. The highest degree of crystallinity and subsequently the maximum intensity and area of CuO (002) diffraction peaks were observed for the samples prepared with templates. The morphology and microstructure of the hybrid were studied using SEM. The core level binding energies of Cu 2p, Sn 3d, and O 1s were measured in these samples. The appearance of a satellite peak in the Cu 2p spectra provided definitive evidence for the presence of Cu 2? ions in these samples. The influence of synthesis conditions such as solvent, precursor type, calcinations temperature and time on the detectability of CuO and the morphology and microstructure of the hybrid were also studied. The calcinations conditions had a significant effect on the appearance and intensity of CuO diffraction peaks.

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Section: Measurementsmentioning

confidence: 99%

Characterization of CuO phase in SnO2–CuO prepared by the modified Pechini method

Majid

Tunney

Argue

et al. 2009

J Sol-Gel Sci Technol

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show abstract

“…On the other hand, DTA curves of the doped solids showed, at lower temperature, the same number of endothermic peaks of those detected for the pure mixed solids. This means that addition of CeO 2 dopant to the reacting mixed solids enhanced the thermal decomposition of both pure nickel nitrate and aluminum hydroxide to NiO [4] and Al 2 O 3 [22]. In addition, a very broad endothermic peak with a minimum located at about 750°C was detected for all pure and variously doped solids.…”

Section: The Thermal Behaviour Of Pure and Doped Mixed Solidsmentioning

confidence: 87%

“…The reaction was followed up through a gasometric measurement of oxygen liberated at different time intervals till no further O 2 was librated. Details of experimental method have been given elsewhere [22].…”

Section: Techniquesmentioning

confidence: 99%

“…The first step in each sample represents the departure of physisorbed water as well as loss of water of crystallization from nitrate compounds. The peak located at about 190°C corresponds to the thermal decomposition of aluminum hydroxide [22] in pure and variously doped samples into Al(OOH). Furthermore, the peak located at 325°C corresponds to formation of nickel and aluminum oxides.…”

Section: The Thermal Behaviour Of Pure and Doped Mixed Solidsmentioning

confidence: 99%

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Effects of doping with CeO2 and calcination temperature on physicochemical properties of the NiO/Al2O3 system

Shaheen¹,

El-Hendawy

2009

Open Chemistry

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Abstract:The effects of doping with CeO 2 and calcination temperature on the physicochemical properties of the NiO/Al 2 O 3 system have been investigated using DTA, XRD, nitrogen adsorption measurements at -196°C and decomposition of H 2 O 2 at 30-50°C. The pure and variously doped solids were subjected to heat treatment at 300, 400, 700, 900 and 1000°C. The results revealed that the specific surface areas increased with increasing calcination temperature from 300 to 400°C and with doping of the system with CeO 2 . The pure and variously doped solids calcined at 300 and 400°C consisted of poorly crystalline NiO dispersed on γ-Al 2 O 3. Heating at 700°C resulted in formation of well crystalline NiO and γ-Al 2 O 3 phases beside CeO 2 for the doped solids. Crystalline NiAl 2 O 4 phase was formed starting from 900°C. The degree of crystallinity of NiAl 2 O 4 increased with increasing the calcination temperature from 900 to 1000°C. An opposite effect was observed upon doping with CeO 2 . The NiO/Al 2 O 3 system calcined at 300 and 400°C has catalytic activity higher than individual NiO obtained at the same calcination temperatures. The catalytic activity of NiO/Al 2 O 3 system increased, progressively, with increasing the amount of CeO 2 dopant and decreased with increasing the calcination temperature.© Versita Warsaw and Springer-Verlag Berlin Heidelberg.

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“…To the best of our knowledge, the synthesis of microparticles of copper carbonate by reacting copper salts with alkali carbonate in aqueous solution at elevated temperatures, stirring, and subsequently isolating the copper carbonate have been reported [5,20], previously. Also, some reports could be found on its thermal characterization [21][22].…”

Section: Introductionmentioning

confidence: 99%

Electrosynthesis and thermal characterization of basic copper carbonate nanoparticles

2009

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Abstract:The present study concerns the electrochemical synthesis of basic copper carbonate nanoparticles by oxidation of metallic copper on the anode in an aqueous bicarbonate solution. This simple and one-step preparation can be considered as green synthesis. The scanning electron microscopy (SEM) analysis indicates that average particle size of the product is in the range of about 70 nm.On the other hand, basic copper carbonate micro-powder has been prepared, by mixing solutions of copper(ΙΙ) sulphate and sodium bicarbonate. The SEM analysis showed that the size of particles prepared in the same way is in the range of about 1 µm. In another part of this study, the thermal decomposition of micro and nanoparticles of copper carbonate produced by various methods was studied in air using TG-DTA techniques. The results of thermal study show that the decomposition of both samples occurs in single step. Also, the TG-DTA analysis of the nanoparticles indicates that the main thermal degradation occurs in the temperature range of 245 -315ºC. However, microparticles of Cu(OH) 2 •CuCO 3 decomposed endothermally in the temperature range of 230 -330ºC.© Versita Warsaw and Springer-Verlag Berlin Heidelberg.

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Effect of thermal treatment on physicochemical properties of pure and mixed manganese carbonate and basic copper carbonate

Cited by 66 publications

References 10 publications

Characterization of CuO phase in SnO2–CuO prepared by the modified Pechini method

Characterization of CuO phase in SnO2–CuO prepared by the modified Pechini method

Effects of doping with CeO2 and calcination temperature on physicochemical properties of the NiO/Al2O3 system

Electrosynthesis and thermal characterization of basic copper carbonate nanoparticles

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