Catalysts prepared from copper–nickel ferrites for the steam reforming of methanol

Huang, Yung Han; Wang, Sea‐Fue; Tsai, A.‐P.; Kameoka, Satoshi

doi:10.1016/j.jpowsour.2015.01.168

Cited by 37 publications

(16 citation statements)

References 27 publications

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“…Only a few studies report the effects of ionic substitution of the first row transition metal ions in the parent spinel lattice. Huang et al have shown that the substitution of Ni into CuFe2O4 (Ni0.5Cu0.5Fe2O4) is effective for MSR, but the spinel phase decomposes after H2 treatment and the catalyst suffers from a very high CO selectivity (~70%) as well as CH4 production [34]. Also Cu1-xZnxAl2O4 with interesting microstructural features works very well for MSR [35].…”

Section: Xanes Studiesmentioning

confidence: 99%

“…dehydrogenation of ethylbenzene [17]; steam reforming of dimethyl ether [18][19][20]; ethanol [21][22][23] and methanol [19,[24][25][26][27][28][29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

“…The trivalent metal ions can also effectively prevent copper sintering which is mainly due to the agglomeration of Cu-particles [36]. A drawback of the spinel based catalysts is the low surface area caused primarily by the high calcination temperatures required for the spinel phase formation that restricts the availability of the active sites [18][19][20]34]. The surface area and other properties can be improved by using different and/or a combination of different synthetic routes.…”

Section: Introductionmentioning

confidence: 99%

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Combustion synthesized copper-ion substituted FeAl2O4 (Cu0.1Fe0.9Al2O4): A superior catalyst for methanol steam reforming compared to its impregnated analogue

Maiti

Llorca

Domínguez

et al. 2016

Journal of Power Sources

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A series of copper ion substituted MAl2O4 (M= Mg, Mn, Fe and Zn) spinels is prepared by a single step solution combustion synthesis (SCS) and tested for methanol steam reforming (MSR). The copper ion substituted Cu0.1Fe0.9Al2O4 appears to be the most active, showing ~98% methanol conversion at 300 °C with ~5% CO selectivity at GHSV= 30000 h-1 and H2O:CH3OH= 1.1. The analogous impregnated catalyst, CuO (10 at.%)/FeAl2O4, is found to be much less active. These materials are characterized by XRD, H2-TPR, BET, HRTEM, XPS and XANES analyses. Spinel phase formation is highly facilitated upon Cu-ion substitution, and Cu loading beyond 10 at.% leads to the formation of CuO as an additional phase. The ionic substitution of copper in FeAl2O4 leads to the highly crystalline SCS catalyst containing Cu 2+ ion sites that are shown to be more active than the dispersed CuO nano-crystallites on the FeAl2O4 impregnated catalyst, despite its lower surface area. The as prepared SCS catalyst contains also a portion of copper as Cu 1+ that increases when subjected to reforming atmosphere. The MSR activity of the SCS catalyst decreases with time-on-stream due to the sintering of catalyst crystallites as established from XPS and HRTEM analyses.

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Section: Xanes Studiesmentioning

confidence: 99%

“…dehydrogenation of ethylbenzene [17]; steam reforming of dimethyl ether [18][19][20]; ethanol [21][22][23] and methanol [19,[24][25][26][27][28][29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Combustion synthesized copper-ion substituted FeAl2O4 (Cu0.1Fe0.9Al2O4): A superior catalyst for methanol steam reforming compared to its impregnated analogue

Maiti

Llorca

Domínguez

et al. 2016

Journal of Power Sources

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“…A copper spinel CuM2O4 (M = Fe, Al, Mn, Ni) has been reported to form metallic Cu nanoparticles in M-oxide matrix by heating in a reducing atmosphere. [24][25][26] If the Cu nanoparticles in the matrix can be selectively removed, nanosized pores will remain in the oxide. Here, we focused on CuFe 2 O 4 , which is expected to form Fe 3 O 4 composite containing Cu nanoparticles after H 2 reduction, because the iron oxide is more electrically conductive than aluminum or manganese oxides to be obtained as a matrix by reducing CuAl 2 O 4 and CuMn 2 O 4 .…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Enhancement in the Electrical Conductivity and Reduction in the Lattice Thermal Conductivity Leading to Enhanced Thermoelectric ZT Realized by Incorporation of Metallic Nanoparticles into Oxide Matrix

Hirata

Ohtaki

2020

Evergreen

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Nanoporous Fe 3 O 4 composites containing metallic Cu nanoparticles were synthesized by reducing-leaching treatment of CuFe 2 O 4 precursor. Thermoelectric properties of the composites sintered at 1270 ºC greatly improved compared with Fe 3 O 4 without Cu, presumably due to a nanoporous structure and the Cu nanoparticles remaining in the Fe 3 O 4 matrix after acid leaching. The electrical and thermal conductivity indicate that Cu in the matrix promotes the electron conduction and suppresses the phonon conduction, improving the dimensionless figure-of-merit, ZT.

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“…Spinel-type copper ferrites are an attractive class of materials, which are characterized by thermal stability, both redox and acid-base characteristics, and good catalytic properties for many reactions such as alcohol decomposition [7,8], selective oxidation [9,10,11], methanol steam reforming [12], water gas shift reaction [13], and ethanol oxidation [14]. Iron molybdates have been used as catalysts in photodegradation reactions [15].…”

Section: Introductionmentioning

confidence: 99%

Molybdenum Dopped Copper Ferrites as Active Catalysts for Alcohols Oxidative Coupling

2019

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Copper ferrites dopped with molybdenum were studied in an oxidative coupling reaction between methanol and ethanol in the gas phase. The catalysts have been characterized by X-ray diffraction, where the presence of ferrite, magnetite, and tenorite phases was observed; scanning electron microscopy; UV-Vis spectroscopy; and Fourier-transform infrared spectroscopy, which highlighted the presence of octahedral coordination of isolated molybdena species. The catalyst with the highest activity in this reaction and with the highest selectivity to hydroxyacetone is the one that presents Lewis sites with weak acidity. The methyl and ethyl acetate selectivities are directly proportional to the Cu/Fe ratio. It has been observed that the presence of reduced copper sites is responsible for the selectivity in esters, while the presence of reduced iron and molybdenum sites is responsible for the acetol production.

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Catalysts prepared from copper–nickel ferrites for the steam reforming of methanol

Cited by 37 publications

References 27 publications

Combustion synthesized copper-ion substituted FeAl2O4 (Cu0.1Fe0.9Al2O4): A superior catalyst for methanol steam reforming compared to its impregnated analogue

Combustion synthesized copper-ion substituted FeAl2O4 (Cu0.1Fe0.9Al2O4): A superior catalyst for methanol steam reforming compared to its impregnated analogue

Simultaneous Enhancement in the Electrical Conductivity and Reduction in the Lattice Thermal Conductivity Leading to Enhanced Thermoelectric ZT Realized by Incorporation of Metallic Nanoparticles into Oxide Matrix

Molybdenum Dopped Copper Ferrites as Active Catalysts for Alcohols Oxidative Coupling

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