Reduction characteristics of CuFe2O4 and Fe3O4 by methane; CuFe2O4 as an oxidant for two-step thermochemical methane reforming

Kang, Kiyoon; Kim, Chang-Hee; Cho, Won Chul; Bae, Ki Kwang; Woo, Sung-Woung; Park, Chu-Sik

doi:10.1016/j.ijhydene.2008.05.054

Cited by 104 publications

(49 citation statements)

References 32 publications

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“…This led to the observed deterioration in redox activity after repeated redox operation. Although Ni-and Cu-ferrites also exhibited an enhancing effect on redox kinetics, Ni and Cu were shown not to be effective in improving sintering resistance [28,29].…”

Section: Effects Of Metal Addition To Oxide Carriersmentioning

confidence: 95%

“…Some metal doped iron oxide oxygen carriers were also supported on ZrO2 for CL processes [29,[35][36][37]. Kodama et al [35,36] showed improved thermal resistance for the Ni-and Coferrites when ZrO2 support was introduced.…”

Section: Supported Oxygen Carriersmentioning

confidence: 99%

“…However, since Fe and Ni are excellent catalysts for methane decomposition, the material was severely deactivated by coke and the subsequent carbide species formed. Because Cu has lower activity for methane decomposition, CuFe2O4 was used to produce syngas from methane [29]. The results showed that no COx was formed during the operation.…”

Section: Supported Oxygen Carriersmentioning

confidence: 99%

See 2 more Smart Citations

Small Scale Hydrogen Production from Metal-Metal Oxide Redox Cycles

Yamaguchi¹,

Tang²,

Burke³

et al. 2012

Hydrogen Energy - Challenges and Perspectives

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Section: Effects Of Metal Addition To Oxide Carriersmentioning

confidence: 95%

Section: Supported Oxygen Carriersmentioning

confidence: 99%

Section: Supported Oxygen Carriersmentioning

confidence: 99%

See 1 more Smart Citation

Small Scale Hydrogen Production from Metal-Metal Oxide Redox Cycles

Yamaguchi¹,

Tang²,

Burke³

et al. 2012

Hydrogen Energy - Challenges and Perspectives

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“…The pattern from the reduced elemental iron powder is indexed as pure iron by JCPDS 87-0721 [24]. The master alloy powder (60Al-40V) is mainly ascribed to Al 3 V (JCPDS 07-0399) with a small amount of Al 8 V 5 (JCPDS 71-0141) [25].…”

Section: Densificationmentioning

confidence: 99%

Microstructural Evolution during Pressureless Sintering of Blended Elemental Ti-Al-V-Fe Titanium Alloys from Fine Hydrogenated-Dehydrogenated Titanium Powder

Cao

Jones

2017

Metals

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Abstract:A comprehensive study was conducted on microstructural evolution of sintered Ti-Al-V-Fe titanium alloys utilizing very fine hydrogenation-dehydrogenation (HDH) titanium powder with a median particle size of 8.84 µm. Both micropores (5-15 µm) and macropores (50-200 µm) were identified in sintered titanium alloys. Spherical micropores were observed in Ti-6Al-4V sintered with fine Ti at the lowest temperature of 1150 • C. The addition of iron can help reduce microporosity and improve microstructural and compositional homogenization. A theoretical calculation of evaporation based on the Miedema model and Langmuir equation indicates that the evaporation of aluminum could be responsible for the formation of the macropores. Although reasonable densification was achieved at low sintering temperatures (93-96% relative density) the samples had poor mechanical properties due mainly to the presence of the macroporosity and the high inherent oxygen content in the as-received fine powders.

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“…have become an important magnetic materials, due to their potential applications in various interdisciplinary areas [3,4]. Among them, spinel copper ferrite (CuFe 2 O 4 ) has been investigated widely, due to their potential significance as magneto-optic materials, catalysts, gas sensor and Li ion batteries [5][6][7][8]. Several techniques have been used to prepare the ferrite nano-and microstructures, such as co-precipitation, solgel, hydrothermal, solvothermal, polyol route and thermal decomposition methods, etc.…”

Section: Introductionmentioning

confidence: 99%

Hibiscus rosa-sinensis Leaf Extracted Green Methods, Magneto-Optical and Catalytic Properties of Spinel CuFe2O4 Nano- and Microstructures

Manikandan

Durka²,

Antony

2015

J Inorg Organomet Polym

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Spinel CuFe 2 O 4 nano-and microstructures were synthesized by a simple, economical and eco-friendly microwave heating (MHM) and modified sol-gel methods (SGM) using metal nitrates and Hibiscus rosa-sinensis leaf extracted solution, instead of toxic inorganic/organic catalyst, template and surfactant. Powder XRD, FT-IR, EDX and SAED results were confirmed that the as-synthesized products have a single-phase spinel structure with high crystallinity and without the presence of any other secondary phase impurities. The morphology of the samples was revealed by HR-SEM and HR-TEM techniques show that the MHM and SGM products consist of nano-and microstructures, respectively, and their possible formation mechanisms were also proposed. The optical band gap (E g ) was measured using Kubelka-Munk model and it shows higher value (2.35 eV) for CuFe 2 O 4 -MHM than CuFe 2 O 4 -SGM (2.18 eV), due to the smaller particle size of CuFe 2 O 4 -MHM. The magnetic property of the samples showed a ferromagnetic behavior and the magnetization (M s ) value of CuFe 2 O 4 -MHM is higher i.e. 61.13 emu/g than CuFe 2 O 4 -SGM (57.25 emu/g). Both the samples were successfully tested as catalysts for the conversion of benzylic alcohols to respective carbonyls using H 2 O 2 (as oxidant) and acetonitrile (as a solvent) catalytic system. It was found that the CuFe 2 O 4 -MHM catalyst show best performance of conversion of aromatic alcohols into aldehydes than that of CuFe 2 O 4 -SGM. Spinel CuFe 2 O 4 catalyst is magnetically recyclable and could be reused with no significant loss in catalytic activity as proved for five consecutive cycles.

show abstract

Reduction characteristics of CuFe2O4 and Fe3O4 by methane; CuFe2O4 as an oxidant for two-step thermochemical methane reforming

Cited by 104 publications

References 32 publications

Small Scale Hydrogen Production from Metal-Metal Oxide Redox Cycles

Small Scale Hydrogen Production from Metal-Metal Oxide Redox Cycles

Microstructural Evolution during Pressureless Sintering of Blended Elemental Ti-Al-V-Fe Titanium Alloys from Fine Hydrogenated-Dehydrogenated Titanium Powder

Hibiscus rosa-sinensis Leaf Extracted Green Methods, Magneto-Optical and Catalytic Properties of Spinel CuFe2O4 Nano- and Microstructures

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