Structural evolution in nanocrystalline Cu obtained by high-energy mechanical milling: Phases formation of copper oxides

Khitouni, Mohamed; Daly, Rakia; Mhadhbi, Mohsen; Kolsi, A. W.

doi:10.1016/j.jallcom.2008.07.081

Cited by 16 publications

(8 citation statements)

References 33 publications

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“…Mechanical alloying occurs faster [20][21], but at the same time, the abrasion of the milling medium increases at a high BPR. Moreover, a high BPR decreases the milling time while increasing the internal temperature, which may promote unwanted reactions [22]. An interrupted cycle is, therefore, preferable in order to cool the vial, even if it increases the milling time.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Contamination during the high-energy milling of atomized copper powder and its effects on spark plasma sintering

et al. 2015

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Section: Accepted Manuscriptmentioning

confidence: 99%

Contamination during the high-energy milling of atomized copper powder and its effects on spark plasma sintering

et al. 2015

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“…For instance, Khitouni et al prepared such catalysts through a high-energy mechanical milling process, using Cu, Cu 2 O, and CuO as the precursors. 18 Although their method is simple, it still lacks effective control of the solid a State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China 100190. E-mail: yjji@ipe.…”

Section: Introductionmentioning

confidence: 99%

Controllable wet synthesis of multicomponent copper-based catalysts for Rochow reaction

Zhai

Wang

et al. 2015

RSC Adv.

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This work aims to provide a facile, low-cost and scalable method for the preparation of the multicomponent Cu-Cu 2 O-CuO catalysts which are highly interested by the organosilane industry. A series of submicrometer-sized and Cu-based catalysts containing CuO, Cu 2 O and Cu or some of them have been synthesized by a simple low-temperature wet chemical method using CuSO 4 ·5H 2 O as the precursor and N 2 H 4 ·H 2 O as reducing agent. The samples were characterized by X-ray diffraction, thermogravimetric analysis, temperature-programmed reduction, X-ray photoelectron spectroscopy, transmission electron microscopy, and scanning electron microscopy techniques. It was observed that the composition of the samples could be tailored by varying the amount of reducing agent at the given reaction temperature and time. These catalysts were then tested for the Rochow reaction using silicon powder and methyl chloride (MeCl) as reactants to produce dimethyldichlorosilane (M2), which is the most important organosilane monomer in the industry.Comparing with the bare CuO and Cu particles, the ternary CuO-Cu 2 O-Cu catalyst displayed much improved M2 selectivity and Si conversion, which can be attributed to the smaller copper particle size and the synergistic effect among the different components in the CuO-Cu 2 O-Cu catalyst. This catalyst preparation method is expected to yield efficient and low-cost copper catalysts for organosilane industry.Among various Cu-based catalysts, the multicomponent Cu-based catalysts containing Cu, Cu 2 O, and CuO are of great interest due to their superior catalytic performances in Rochow reaction. For instance, Khitouni et al prepared such kind of catalysts through a high-energy mechanical milling process using Cu, Cu 2 O, and CuO as the precursors. 18 Although their method is simple, it still lacks effective controls on the solid reaction among Cu, Cu 2 O, and CuO during the mechanical milling process. Therefore, to meet industrial application, more effective methods for preparing multicomponent Cu-based catalysts should be developed. More recently, we found that the multicomponent Cu-Cu 2 O-CuO catalyst can also be synthesized by partial reduction of CuO nanoparticles in H 2 /N 2 gas 19 or by controlled oxidation of copper flakes in O 2 /N 2 gas. 20 These methods, however, still suffer from the low yields and use of high-cost equipment together with intensive energy consumption (high temperature), which are troublesome and thus limit their further application. On the other hand, we have noticed that there are scarce reports concerning about the preparation of multicomponent Cu-based catalysts via wet chemical approaches.Herein, we report a facile and low cost preparation of the ternary CuO-Cu 2 O-Cu catalyst by wet chemical method with obvious advantages such as mild reaction condition (70 o C), large-scale production capability and easy operation. Most importantly, the composition of the samples could be tailored by simply varying the amount of N 2 H 4 ·H 2 O as reducing agent. The prepared terna...

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“…In the literature, the influence of the milling environment on the powder obtained at the end of the MA process has not been widely studied. Azabou et al [24] and Khitouni et al [25] reported that a stable copper oxide phase could be obtained by MA under an air atmosphere. Yoon et al [26] have studied the influence of different milling atmospheres on the thermoelectric and mechanical properties of Bi-Sb-Te alloys.…”

Section: Introductionmentioning

confidence: 99%

Solid solution evolution during mechanical alloying in Cu-Nb-Al compounds

Zaara

Chemingui

Optasanu

et al. 2019

Int J Miner Metall Mater

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Structural evolution in nanocrystalline Cu obtained by high-energy mechanical milling: Phases formation of copper oxides

Cited by 16 publications

References 33 publications

Contamination during the high-energy milling of atomized copper powder and its effects on spark plasma sintering

Contamination during the high-energy milling of atomized copper powder and its effects on spark plasma sintering

Controllable wet synthesis of multicomponent copper-based catalysts for Rochow reaction

Solid solution evolution during mechanical alloying in Cu-Nb-Al compounds

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