Initial steps in the production of H2 from ethanol: A FT-IR study of adsorbed species on Ni/MgO catalyst surface

Resini, Carlo; Cavallaro, S.; Frusteri, F.; Freni, S.; Busca, Guido

doi:10.1007/s11144-007-5027-2

Cited by 28 publications

(19 citation statements)

References 23 publications

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“…The NMR analysis of the obtained liquid effluent reveals the presence of acetaldehyde and no acetone is detected. Acetaldehyde and acetone are important intermediates in the formation of syngas in the steam reforming reaction [40][41][42]. The formation of the two intermediates is attributed to different mechanisms.…”

Section: Catalyst Activity and Stabilitymentioning

confidence: 99%

Co–Ni Catalysts Derived from Hydrotalcite-Like Materials for Hydrogen Production by Ethanol Steam Reforming

et al. 2009

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A series of Co-Ni catalysts, prepared from hydrotalcite (HT)-like materials by co-precipitation, has been studied for the hydrogen production by ethanol steam reforming. The total metal loading was fixed at 40% and the Co-Ni composition was varied (40-0, 30-10, 20-20, 10-30 and 0-40). The catalysts were characterized using X-ray diffraction, N 2 physisorption, H 2 chemisorption, temperature-programmed reduction, scanning transmission electron microscope and energy dispersive spectroscopy. The results demonstrated that the particle size and reducibility of the Co-Ni catalysts are influenced by the degree of formation of a HT-like structure, increasing with Co content. All the catalysts were active and stable at 575°C during the course of ethanol steam reforming with a molar ratio of H 2 O:ethanol = 3:1. The activity decreased in the order 30Co-10Ni [ 40Co * 20Ni-20Co * 10Co-30Ni [ 40Ni. The 40Ni catalyst displayed the strongest resistance to deactivation, while all the Co-containing catalysts exhibited much higher activity than the 40Ni catalyst. The hydrogen selectivities were high and similar among the catalysts, the highest yield of hydrogen was found over the 30Co-10Ni catalyst. In general, the best catalytic performance is obtained with the 30Co-10Ni catalyst, in which Co and Ni are intimately mixed and dispersed in the HT-derived support, as indicated by the STEM micrograph and complementary mapping of Co, Ni, Al, Mg and O.

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Section: Catalyst Activity and Stabilitymentioning

confidence: 99%

Co–Ni Catalysts Derived from Hydrotalcite-Like Materials for Hydrogen Production by Ethanol Steam Reforming

et al. 2009

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“…A group of studies have examined the reaction pathways through product distribution analysis at various reaction conditions (e.g., temperature [15][16][17][18][19][20], gas space velocity [9], concentration [21], and reactant molar ratio [22,23]). Others have focused on monitoring the evolution of surface intermediates involved in chemical bond formation and cleavage through in situ FT-IR technique [24][25][26][27][28][29]. The integration of these two approaches is important for acquiring a comprehensive understanding of the mechanistic steps involved in different reaction pathways that control selectivity.…”

Section: Introductionmentioning

confidence: 99%

Adsorption/Desorption Behavior of Ethanol Steam Reforming Reactants and Intermediates over Supported Cobalt Catalysts

et al. 2010

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The interactions of reactants and intermediates with the surfaces in ethanol steam reforming over Co catalysts supported on ZrO 2 and CeO 2 were investigated using Temperature Programmed Desorption, Thermogravimetric Analysis-Differential Scanning Calorimetry (TGA-DSC), in situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) and isotopic labeling techniques. Possible mechanistic steps are proposed that lead to acetaldehyde and acetone formation, steam reforming and coking. The role of the support versus active metal (i.e., Co) and the involvement of water in the reaction network are discussed.

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“…On the other hand, the activity of Ni diminishes due to coke deposition on the catalyst surface in ethanol steam reforming. The addition of alkali (MgO) can decrease carbon deposition because the acid sites on catalysts are neutralized, preventing the formation of ethylene coming from dehydration reactions [16]. In addition, the highly dispersed active metal can minimize the carbon formation by adding other metal as promoters.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Production by Ethanol Steam Reforming on NiCuMgAl Catalysts Derived from Hydrotalcite-Like Precursors

Chu

Wang

et al. 2011

Catal Lett

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Cu-promoted NiMgAl catalysts derived from hydrotalcites were synthesized by the urea hydrolysis method for ethanol steam reforming. The effect of Cu content on catalytic properties of the NiMgAl catalysts was studied. These catalysts were characterized by X-ray diffraction, thermogravimetric and differential analyses, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy and temperature-programmed reduction. The addition of small amounts of Cu to NiMgAl catalysts leads to the increase of surface Ni species and the enhancement of Ni 2? reducibility. The Ni 0.5 Cu 0.1 Mg 2.4 Al catalyst with Cu/Ni ratio of 0.2 exhibits the higher activity and stability, showing no apparent deactivation during 20 h on stream at 700°C, whereas Ni 0.5 Mg 2.5 Al catalyst suffers severe deactivation only after 10 h on stream. This improved performance is closely related to smaller nickel particles well dispersed on the catalyst surface. The Ni 0.5 Cu 0.1 Mg 2.4 Al catalyst exhibits strong resistance to coke formation and the sintering of nickel particles.

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Initial steps in the production of H2 from ethanol: A FT-IR study of adsorbed species on Ni/MgO catalyst surface

Cited by 28 publications

References 23 publications

Co–Ni Catalysts Derived from Hydrotalcite-Like Materials for Hydrogen Production by Ethanol Steam Reforming

Co–Ni Catalysts Derived from Hydrotalcite-Like Materials for Hydrogen Production by Ethanol Steam Reforming

Adsorption/Desorption Behavior of Ethanol Steam Reforming Reactants and Intermediates over Supported Cobalt Catalysts

Hydrogen Production by Ethanol Steam Reforming on NiCuMgAl Catalysts Derived from Hydrotalcite-Like Precursors

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