CO2 decomposition over freshly reduced nano-crystallite Cu0.5Zn0.5Fe2O4 at 400–600°C

Khedr, M.H.; Halim, K. S. Abdel; Zaki, A.H.

doi:10.1016/j.jaap.2007.12.006

Cited by 12 publications

(5 citation statements)

References 16 publications

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“…169 Reduced metallic bearing ferrites have been investigated by Khedr et al for CO 2 reduction to form CNTs during the re-oxidation of different freshly reduced ferrites with oxygen deficiency. [170][171][172][173] Some transition metals such as iron have been employed to catalyze the CO 2 -growth CNTs under a H 2 atmosphere. 174 A large amount of the waste produced all over the world consists of polymers from plastics.…”

Section: Chemical Vapor Depositionmentioning

confidence: 99%

Carbon nanotube catalysts: recent advances in synthesis, characterization and applications

et al. 2015

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Carbon nanotubes are promising materials for various applications. In recent years, progress in manufacturing and functionalizing carbon nanotubes has been made to achieve the control of bulk and surface properties including the wettability, acid-base properties, adsorption, electric conductivity and capacitance. In order to gain the optimal benefit of carbon nanotubes, comprehensive understanding on manufacturing and functionalizing carbon nanotubes ought to be systematically developed. This review summarizes methodologies of manufacturing carbon nanotubes via arc discharge, laser ablation and chemical vapor deposition and functionalizing carbon nanotubes through surface oxidation and activation, doping of heteroatoms, halogenation, sulfonation, grafting, polymer coating, noncovalent functionalization and nanoparticle attachment. The characterization techniques detecting the bulk nature and surface properties as well as the effects of various functionalization approaches on modifying the surface properties for specific applications in catalysis including heterogeneous catalysis, photocatalysis, photoelectrocatalysis and electrocatalysis are highlighted.

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Section: Chemical Vapor Depositionmentioning

confidence: 99%

Carbon nanotube catalysts: recent advances in synthesis, characterization and applications

et al. 2015

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“…The results showed that the reaction primarily occurred heterogeneously on the reaction zone surfaces, resulting in low particle yields and ZnO production in the aerosol flow. 19 As pointed out previously, 4 CO 2 dissociation was also investigated experimentally with mechanically milled magnetite, 20 nano-sized Fe 2 O 3 , 21,22 oxygen-deficient magnetite, 23,24 and doped ferrites, 25,26 suggesting a new carbon fixation system mediated through iron oxides.…”

Section: Introductionmentioning

confidence: 66%

CO₂Dissociation and Upgrading from Two-Step Solar Thermochemical Processes Based on ZnO/Zn and SnO₂/SnO Redox Pairs

Abanades¹,

Chambon²

2010

Energy Fuels

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This study addresses the solar thermochemical CO2 splitting via ZnO/Zn and SnO2/SnO two-step cycles. This process targets the recycling and upgrading of CO2 emissions for the production of solar fuels. Reactive Zn- and SnO-rich nanopowders were first synthesized in a high-temperature solar chemical reactor. Their reactivity was then investigated to demonstrate that the produced nanoparticles react efficiently with CO2, which generates CO and the initial metal oxide that can be recycled. While thermodynamics predict the formation of carbon at low temperatures and a narrow temperature range, in which CO formation is favored, experimental studies were performed in both thermogravimetry and a fixed-bed reactor to demonstrate that the CO2-splitting reaction is able to produce CO with high chemical conversions. The Zn oxidation with CO2 was almost complete and fast from 360 °C, whereas the SnO oxidation required both higher temperatures (around 800 °C) and reaction duration to reach significant conversion (about 85%). Complete SnO conversion was achieved during dynamic thermogravimetric runs up to 1100 °C. The reaction rates increased with the inlet CO2 mole fraction. The fixed-bed configuration appeared suitable for efficient conversion of the solar-produced Zn metallic powders.

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“…Because of this, the effect of binary as well as ternary metal doping for carbon dioxide decomposition was also studied by Ma et al ., Farghali et al . and Khedr et al 13‐15 . These metal oxides include copper, nickel as well as zinc ferrite.…”

Section: Introductionmentioning

confidence: 99%

“…The overall reaction mechanism of CO 2 decomposition by ferrite‐based catalyst can be generally described by Eqns (1) and (2): 7

MF e_{2} O_{4 ((), s)} + {δH}_{2 ((), g)} \to MF e_{2} O_{4 - normalδ ((), s)} + normalδ H_{2} O_{(normalg)}

MF e_{2} O_{4 - normalδ ((), s)} + {CO}_{2 ((), g)} \to MF e_{2} O_{4 ((), s)} + {CO}_{2 - normalδ ((), g)}

Where M represents the second metal in these ferrite structures. Nickel ferrite, chromium‐doped nickel ferrite, nickel–zinc (Ni, Zn) ferrite, nickel–copper–zinc (Ni, Cu, Zn) ferrite, cobalt ferrite, copper ferrite and manganese ferrite 8‐17 were found to be catalytically active for the complete decomposition of CO 2 . Lin et al ., Ma et al .…”

Section: Introductionmentioning

confidence: 99%

The catalytic decomposition of carbon dioxide on zinc‐exchanged Y‐zeolite at low temperatures

Bajaj

Selvakannan

Singh

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND We report our recent study on the use of a zinc‐modified NaY zeolite to decompose CO2 at a temperature range between 300 and 550 °C. RESULTS At a reaction temperature of 450 °C, we observed that 70% of CO2 was converted with an insignificant quantity of CO produced. Scanning electron microscopy and Fourier transform infrared spectroscopic analysis of the neat and spent catalysts confirmed the presence of carbon nanostructures after the reaction. In addition to this, CHN analysis supports these results by providing weight percent (0.73 wt%) of carbon after reaction. Stability of the catalyst was further confirmed with slight/no change in X‐ray diffraction technique. CONCLUSION This route potentially offers a facile strategy to achieve CO2 decomposition and an explanation of the formation of carbon on zinc‐modified zeolite catalysts. © 2021 Society of Chemical Industry (SCI).

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CO2 decomposition over freshly reduced nano-crystallite Cu0.5Zn0.5Fe2O4 at 400–600°C

Cited by 12 publications

References 16 publications

Carbon nanotube catalysts: recent advances in synthesis, characterization and applications

Carbon nanotube catalysts: recent advances in synthesis, characterization and applications

CO₂Dissociation and Upgrading from Two-Step Solar Thermochemical Processes Based on ZnO/Zn and SnO₂/SnO Redox Pairs

The catalytic decomposition of carbon dioxide on zinc‐exchanged Y‐zeolite at low temperatures

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CO2 decomposition over freshly reduced nano-crystallite Cu0.5Zn0.5Fe2O4 at 400–600°C

Cited by 12 publications

References 16 publications

Carbon nanotube catalysts: recent advances in synthesis, characterization and applications

Carbon nanotube catalysts: recent advances in synthesis, characterization and applications

CO2Dissociation and Upgrading from Two-Step Solar Thermochemical Processes Based on ZnO/Zn and SnO2/SnO Redox Pairs

The catalytic decomposition of carbon dioxide on zinc‐exchanged Y‐zeolite at low temperatures

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Product

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CO₂Dissociation and Upgrading from Two-Step Solar Thermochemical Processes Based on ZnO/Zn and SnO₂/SnO Redox Pairs