Characterization of Cu-SiO2 Composite Synthesized by Hydrogen Reduction of Chalcopyrite Concentrate Followed by Acid Leaching

Chatterjee, Ranajit; Ghosh, Dibyendu

doi:10.1007/s11663-013-9892-y

Cited by 5 publications

(4 citation statements)

References 21 publications

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“…From the micrographs and values in Table , it is noted that the average particle size of copper increases with the Mg/Al molar ratio, suggesting that the incorporation of Al 3+ ions in the support reduced the aggregation and enhanced the distribution of the metal particles (see Table ). Additionally, the HRTEM results (Figure S4 in the Supporting Information) showed that the d -spacing of 0.21 nm of the Cu/MgAl-0.5 micrograph is in good agreement with the spacing of the (111) plane of Cu metal, verifying the presence of metallic copper in the reduced material, which is consistent with the XRD results. , …”

Section: Resultssupporting

confidence: 83%

“…Additionally, the HRTEM results (Figure S4 in the Supporting Information) showed that the d-spacing of 0.21 nm of the Cu/ MgAl-0.5 micrograph is in good agreement with the spacing of the (111) plane of Cu metal, verifying the presence of metallic copper in the reduced material, which is consistent with the XRD results. 53,56 The temperature-programmed reduction profiles of the catalysts are shown in Figure 2. In agreement with data reported in the literature, 54,57,58 the small peak at ∼200 °C (peak number 1) is ascribed to highly dispersed copper particles, while the peak at high temperature (250−270 °C) (peak number 2) is attributed to the reduction of larger metal particles.…”

Section: Resultsmentioning

confidence: 99%

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Selective Catalytic Route for the Synthesis of High-Density Biofuel Using Biomass-Derived Compounds

2017

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A novel strategy for the synthesis of high-density biofuel using two biomass-derived oxygenated compounds, furfural and guaiacol, with a variety of heterogeneous catalysts is proposed. In the first step of this strategy, furfural is converted with high yields and selectivity to cyclopentanol (CPOL) over Mg-Al supported Cu catalysts. Then, the cyclopentanol is used to alkylate guaiacol over a series of HY zeolites to generate C9–C16 oxygenates with an appropriate molecular weight to be used as transportation fuels. Finally, in the last step of this catalytic strategy, the C-alkylation products are successfully hydrodeoxygenated over ruthenium nanoparticles supported on carbon nanotubes (Ru/MWCNT), producing a liquid mixture of cyclic hydrocarbons with high density (0.865 g mL–1 at 20 °C) and excellent low-temperature properties. This overall reaction route is a promising approach for converting biomass-derived compounds into transportation fuel precursors.

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Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Selective Catalytic Route for the Synthesis of High-Density Biofuel Using Biomass-Derived Compounds

2017

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“…The tensile strength of the composites is 279MPa, which is increased by 120% compared with 127MPa of the matrix alloy. The microstructure and property show that the process parameters are reasonable [14,15]. The tensile fracture of the C f /Al composite is shown in Fig 7(b).…”

Section: Fabrication Of C F /Al Composites With Complex Curved Surfacementioning

confidence: 81%

Experimental Study on C<sub>F</sub>/Al Composite Plate with Complex Curved Surface Fabricated by Liquid-Solid Infiltration Extrusion

Han

Zhou

et al. 2019

SSP

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In this paper, continuous carbon fiber reinforced aluminum matrix (Cf/Al) composite plate with complex curved surface is fabricated by liquid-solid infiltration extrusion. The influence of fabrication parameters, such as the melting temperature, extrusion temperature and extrusion pressure on the Cf/Al composite plate is studied. The experimental results show that the liquid-solid infiltration extrusion process can be used to fabricate the Cf/Al composite with curved surface. The Cf/Al composite exhibits good infiltration and well-formed quality when the extrusion pressure is 50MPa, the extrusion temperature is 670°C and the melting temperature is 690°C. According to the microstructure observation, the carbon fiber uniformly distributes in the aluminum alloy matrix without damage and obvious defects. The density of the composite is decreased by 17.9%, from 2.71g/cm3 to 2.29g/cm3, which is lower than that of the matrix alloy, and the ultimate tensile strength is increased by 120% compared with the matrix alloy, from 127MPa to 279MPa.

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“…Another point is to be noted that the EDS/AAS analysis for the copper concentration of the post-leach samples in Table IV included a small contribution from the Cu 2 O present as an impurity with Cu and SiO 2 . A Rietveld refinement analysis of the post-leach sample, corresponding to the reduction temperature 1323 K (1050°C), gave the following composition: Cu (53.3 pct)-SiO 2 (44 pct)-Cu 2 O (2.7 pct), [22] as compared to the 59.8 pct Cu (Table IV). In any case, this result, which gives the maximum copper concentration in the post-leach product, is in good agreement with the final mixture (59 pct Cu-41 pct SiO 2 ) predicted from the mass balance on the starting chalcopyrite concentrate.…”

Section: Synthesis Of Cu-sio 2 Compositementioning

confidence: 99%

Kinetics of Hydrogen Reduction of Chalcopyrite Concentrate

Chatterjee

Ghosh

2015

Metall Mater Trans B

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A Ghatshila chalcopyrite concentrate (average particle size, 50 lm) containing primarily CuFeS 2 and SiO 2 (Cu 16 pct) was reduced by a stream of hydrogen in a thermogravimetric analyzer (TGA) at selected temperatures [1173 K to 1323 K (900°C to 1050°C)], hydrogen flow rates, partial pressures of hydrogen (0.33 9 101.3 to 101.3 kPa), and sample bed heights. The product was a mixture of Cu (26 pct), SiO 2 , CuFeO 2 , and Fe. The rate equations for the three typical controlling mechanisms, namely, gas film diffusion (mass transfer), pore diffusion, and interfacial reaction, have been derived for the system geometry under study and applied to identify the rate-controlling steps. The first stage of the reduction, which extended up to the first 13 minutes, was rate controlled by the interfacial reaction. The last stage, which spanned over the last 60 to 120 minutes and accounted for a small percentage of reduction, was controlled by pore diffusion through the built-up Cu (and Fe) layer. The activation energy in the first stage was 101 kJ mol À1 and that in the second stage was 76 kJ mol À1 . Subsequent acid leaching with 1 M HCl solution of the reduction product removed all soluble species, leaving a Cu (53.3 pct) + SiO 2 mixture, with a small concentration (2.7 pct) of Cu 2 O in it. This result compares well with the predicted final mixture of Cu (59 pct)-SiO 2 based on a mass balance on the starting concentrate. A follow-up heating at 1523 K (1250°C) produced a sintered Cu-SiO 2 composite with spherical copper particles of 400 lm diameter embedded in a silica matrix. Elemental chemical analyses were carried out by energy-dispersive X-ray spectroscopy/atomic absorption spectroscopy. The phase identification and microstructural characterization of CuSiO 2 mixtures were carried out by X-ray powder diffraction and optical microscopy.

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Characterization of Cu-SiO2 Composite Synthesized by Hydrogen Reduction of Chalcopyrite Concentrate Followed by Acid Leaching

Cited by 5 publications

References 21 publications

Selective Catalytic Route for the Synthesis of High-Density Biofuel Using Biomass-Derived Compounds

Selective Catalytic Route for the Synthesis of High-Density Biofuel Using Biomass-Derived Compounds

Experimental Study on C<sub>F</sub>/Al Composite Plate with Complex Curved Surface Fabricated by Liquid-Solid Infiltration Extrusion

Kinetics of Hydrogen Reduction of Chalcopyrite Concentrate

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