New Cu-based mixed oxides obtained from LDH precursors, catalysts for methane total oxidation

Tanasoi, Serghei; Tanchoux, Nathalie; Urdă, Adriana; Tichit, Didier; Săndulescu, Ioan; Fajula, François; Marcu, Ioan–Cezar

doi:10.1016/j.apcata.2009.05.007

Cited by 91 publications

(53 citation statements)

References 29 publications

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“…In the low-temperature region, the peaks can be attributed to the reduction of the highly reducible copper from well-dispersed CuO. The more intense peaks at higher temperature of 360 ºC are attributed to the reduction of copper in CuO particles interacting more strongly with the support (Jiang et al, 2012;Kovanda, Jirátová, Rymeš, & Koloušek, 2001;Tanasoi et al, 2009;Villaverde, Garetto, & Marchi, 2015). The same behavior could be ascribed to the Cu/ZnAl oxides.…”

Section: The Chemical Compositions Of the Mixed Oxides Reported Insupporting

confidence: 59%

Hydrodeoxygenation of furfuryl alcohol over Cu/MgAl and Cu/ZnAl catalysts derived from hydrotalcite-like precursors: A reaction for bio-oil upgrading

Pino¹,

Hincapié²,

López³

2017

ing.inv.

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The aqueous phase hydrodeoxygenation (HDO) of furfuryl alcohol over Cu/MgAl and Cu/ZnAl catalysts with different Mg/Al and Zn/ Al molar ratios, were investigated. Mg-Al and Zn-Al mixed oxides derived from hydrotalcites precursors were used as supports, which were impregnated with an aqueous solution of copper nitrate by incipient wetness impregnation. The HDO reaction was carried out in a typical batch reactor at 5 MPa of H 2 and 200 °C for 4 h. Among the catalysts studied, the Cu/MgAl-0.5 catalyst exhibited the higher furfuryl alcohol conversion (86 %) and yield of cyclopentanol (35 %), which is the reaction product with the highest hydrogencarbon (H/C) ratio. With the Cu/MgAl-3 catalyst a high cyclopentanone yield (67 %) was achieved. The results obtained, showed that copper supported on mixed oxides catalysts derived from hydrotalcite precursors are a promising alternative to improve the bio-oil quality.Keywords: Hydrotalcites, cyclopentanol, furfuryl alcohol, copper, bio-oil upgrading. RESUMENSe investigó la hidrodesoxigenación(HDO) del furfuril alcohol sobre catalizadores de Cu/MgAl y Cu/ZnAl con diferentes relaciones molares Mg/Al y Zn/Al. Óxidos mixtos de Mg-Al y Zn-Al derivados de precursores tipo hidrotalcitas se usaron como soporte, los cuales fueron impregnados con una solución acuosa de nitrato de cobre, mediante el método de impregnación húmeda. La reacción de hidrodesoxigenación (HDO) se realizó en un reactor tipo batch a 5 MPa de H 2 y 200 °C por 4 h. Entre los catalizadores estudiados, el catalizador de Cu/MgAl-0.5 exhibió la más alta conversión del furfuril alcohol (86 %) y rendimiento hacia ciclopentanol (35 %), el cual es el producto de reacción con mayor relación hidrógeno-carbono (H/C). Con el catalizador de Cu/MgAl-3 se logró un alto rendimiento hacia ciclopentanona (67 %). Los resultados obtenidos, mostraron que los catalizadores de óxidos mixtos derivados de precursores tipo hidrotalcitas son una alternativa prometedora para mejorar las características del bio-oil.Palabras clave: Hidrotalcitas, ciclopentanol, furfuril alcohol, cobre, mejora del bio-aceite.

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Section: The Chemical Compositions Of the Mixed Oxides Reported Insupporting

confidence: 59%

Hydrodeoxygenation of furfuryl alcohol over Cu/MgAl and Cu/ZnAl catalysts derived from hydrotalcite-like precursors: A reaction for bio-oil upgrading

Pino¹,

Hincapié²,

López³

2017

ing.inv.

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“…(iii) The upgrading of polyols (1,3-butanediol) on these materials gives valuable oxygenates by either dehydrogenation or dehydration reactions, depending on the copper loading [10]. Recently, other researchers have shown that similar Cu-Mg-Al mixed oxides promote C-C coupling [11,12], aqueous phase hydrogenation [13] and several oxidation [14][15][16] reactions, among many other applications.…”

Section: Introductionmentioning

confidence: 97%

Conversion of Biomass-Derived 2-Hexanol to Liquid Transportation Fuels: Study of the Reaction Mechanism on Cu–Mg–Al Mixed Oxides

2015

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The reaction mechanism of 2-hexanol conversion to high molecular weight compounds to be used as liquid transportation fuels was studied on MgO, Cu/SiO 2 and a bifunctional Cu-Mg-Al mixed oxide with 8 wt% Cu (catalyst 8.0CuMgAl). Catalysts were characterized by several physical and spectroscopic techniques. The evolution of 2-hexanol conversion and yields in inert (N 2 ) and reducing (H 2 ) reaction atmospheres at different contact times (W/F 0 ) was investigated, which allowed distinguishing between primary and secondary products. In H 2 , at W/F 0 = 500 g h/mol, the bifunctional 8.0CuMgAl catalyst yielded more than 90 % of branched C9-C24 oxygenates and hydrocarbons that were obtained via sequential steps comprising dehydrogenation, C-C coupling, dehydration and hydrogenation reactions. The metal-base bifunctional nature of this reaction network on 8.0CuMgAl was elucidated: nano-sized Cu 0 particles promote dehydrogenation and hydrogenation steps whereas Mg-O pairs participate mainly in C-C coupling reactions. The product distribution depended on the reaction atmosphere. In H 2 , the reaction pathways leading to formation of even carbon atom number products (C12, C18 and C24) were favored and hydrocarbons were the main products at high conversion levels. In N 2 , significant amounts of odd carbon atom number products (C9, C15 and C21) were formed with a higher contribution of oxygenates to the product pool.

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“…For this reason the materials have been recognized as particularly promising precursors of mixed oxide catalysts [49]. In the case of hydrotalcite-derived catalysts tested for methane combustion the use of Co, Mn, Fe, Ni, or Cu incorporated as main components into the precursor structure has been reported [24,27,34,35,39,45,46]. In the majority of works the investigated catalytic systems contained one transition metal introduced into the Mg-Al hydrotalcite structure.…”

Section: Introductionmentioning

confidence: 99%

“…A number of works address the role of the catalyst preparation method and the nature of the oxide precursor [15,19,20,30,31,33,[40][41][42][43]. In particular, the use of precursors related to the naturally occurring mineral known under the name of hydrotalcite has been indicated as providing particularly active mixed oxide catalysts [24,27,34,35,39,45,46]. Natural hydrotalcite is a layered magnesium aluminium hydroxy carbonate, but the structure can accommodate a number of other cations, in a broad range of ionic radii [48].…”

Section: Introductionmentioning

confidence: 99%

Cu/Mn-based mixed oxides derived from hydrotalcite-like precursors as catalysts for methane combustion

Machej

Serwicka

Zimowska

et al. 2014

Applied Catalysis A: General

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New Cu-based mixed oxides obtained from LDH precursors, catalysts for methane total oxidation

Cited by 91 publications

References 29 publications

Hydrodeoxygenation of furfuryl alcohol over Cu/MgAl and Cu/ZnAl catalysts derived from hydrotalcite-like precursors: A reaction for bio-oil upgrading

Hydrodeoxygenation of furfuryl alcohol over Cu/MgAl and Cu/ZnAl catalysts derived from hydrotalcite-like precursors: A reaction for bio-oil upgrading

Conversion of Biomass-Derived 2-Hexanol to Liquid Transportation Fuels: Study of the Reaction Mechanism on Cu–Mg–Al Mixed Oxides

Cu/Mn-based mixed oxides derived from hydrotalcite-like precursors as catalysts for methane combustion

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