Thermo-Exfoliated Graphite Containing CuO/Cu2(OH)3NO3:(Co2+/Fe3+) Composites: Preparation, Characterization and Catalytic Performance in CO Conversion

Ischenko, Elena V.; Matzui, L. Yu.; Gaidai, Snizhana V.; Вовченко, Л. Л.; Kartashova, T. V.; Lisnyak, Vladyslav V.

doi:10.3390/ma3010572

Cited by 25 publications

(5 citation statements)

References 33 publications

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“…This is due to the removal of the physical adsorption and the crystal water, and due to the decomposition of basic salt, basic nitrate, basic carbonate, or the carbonate of Cu after calcination. The shoulder peak at 568 cm −1 indicates the formation of CuO species in the CuO/SiO 2 after calcination [39,40]. The absorption peaks at 1040 and 670 cm −1 are more obvious in the CuO/SiO 2 (DP) and CuO/SiO 2 (AE) catalysts after calcination, indicating the presence of copper phyllosilicate [41].…”

Section: Resultsmentioning

confidence: 99%

Regulation of Cu Species in CuO/SiO2 and Its Structural Evolution in Ethynylation Reaction

Ban

Wang

et al. 2019

Nanomaterials

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A Cu-based nano-catalyst has been widely used in the ethynylation of formaldehyde; however, the effects of the presence of Cu on the reaction have not yet been reported. CuO/SiO2 catalysts with different Cu species were prepared by impregnation (IM), deposition–precipitation (DP), and ammonia evaporation (AE). The structural evolution of the Cu species in different states of the ethynylation reaction and the structure–activity relationship between the existence state of the Cu species and the catalytic properties of the ethynylation reaction were studied. The results show that the Cu species in the CuO/SiO2 (IM), prepared using the impregnation method, are in the form of bulk CuO, with large particles and no interactions with the support. The bulk CuO species are transformed into Cu+ with a low exposure surface at the beginning of the reaction, which is easily lost. Thus, this approach shows the lowest initial activity and poor cycle stability. A high dispersion of CuO and copper phyllosilicate exists in CuO/SiO2 (DP). The former makes the catalyst have the best initial activity, while the latter slows release, maintaining the stability of the catalyst. There is mainly copper phyllosilicate in CuO/SiO2 (AE), which is slowly transformed into a highly dispersed and stable Cu+ center in the in situ reaction. Although the initial activity of the catalyst is not optimal, it has the optimal service stability.

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Section: Resultsmentioning

confidence: 99%

Regulation of Cu Species in CuO/SiO2 and Its Structural Evolution in Ethynylation Reaction

Ban

Wang

et al. 2019

Nanomaterials

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“…Furthermore, EG is effective as a support for Si-based Li-ion battery anodes [89]. In addition, EG [90,91] is effective as a catalyst support.…”

Section: Exfoliated Graphite Compositesmentioning

confidence: 99%

A review of exfoliated graphite

2015

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Exfoliated graphite (EG) refers to graphite that has a degree of separation of a substantial portion of the carbon layers in the graphite. Graphite nanoplatelet (GNP) is commonly prepared by mechanical agitation of EG. The EG exhibits clinginess, due to its cellular structure, but GNP does not. The clinginess allows the formation of EG compacts and flexible graphite sheet without a binder. The exfoliation typically involves intercalation, followed by heating. Upon heating, the intercalate vaporizes and/or decomposes into smaller molecules, thus causing expansion and cell formation. The sliding of the carbon layers relative to one another enables the cell wall to stretch. The exfoliation process is accompanied by intercalate desorption, so that only a small portion of the intercalate remains after exfoliation. The most widely used intercalate is sulfuric acid. The higher concentration of residue in unwashed EG causes the relative dielectric constant (50 Hz) of the EG to be 360 (higher than 120 for KOH-activated GNP), compared to the value of 38 for the water-washed case. An EG compact is obtained by the compression of EG at a pressure lower than that used for the fabrication of flexible graphite. Compared to flexible graphite, EG compacts are mechanically weak, but they exhibit viscous character, outof-plane electrical/thermal conductivity and liquid permeability. The viscous character (flexural loss tangent up to 35 for the solid part of the compact) stems from the sliding of the carbon layers relative to one another, with the ease of the sliding enhanced by the exfoliation process.

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“…This character allows one to prepare novel layered materials with potential applications by anion-exchange reactions starting from Cu 2 (OH) 3 NO 3 [16][17][18]. Based on the sim- [20]. This may be the only report on Cu 2 (OH) 3 NO 3 used directly as a catalyst.…”

Section: No 3 )mentioning

confidence: 99%

Catalytic wet peroxide oxidation of azo dye (Direct Blue 15) using solvothermally synthesized copper hydroxide nitrate as catalyst

Zhan

Zhou

et al. 2011

Journal of Hazardous Materials

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Thermo-Exfoliated Graphite Containing CuO/Cu2(OH)3NO3:(Co2+/Fe3+) Composites: Preparation, Characterization and Catalytic Performance in CO Conversion

Cited by 25 publications

References 33 publications

Regulation of Cu Species in CuO/SiO2 and Its Structural Evolution in Ethynylation Reaction

Regulation of Cu Species in CuO/SiO2 and Its Structural Evolution in Ethynylation Reaction

A review of exfoliated graphite

Catalytic wet peroxide oxidation of azo dye (Direct Blue 15) using solvothermally synthesized copper hydroxide nitrate as catalyst

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