Active Cu/ZnO and Cu/ZnO/Al2O3 catalysts prepared by homogeneous precipitation method in steam reforming of methanol

Shishido, Tetsuya; Yamamoto, Yoshihiro; Morioka, Hiroyuki; Takaki, Ken; Takehira, Katsuomi

doi:10.1016/j.apcata.2003.12.018

Cited by 220 publications

(116 citation statements)

References 17 publications

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“…As described in the introduction, when using the copper nitrate/urea solution the copper ions and urea react forming copper hydroxide upon heating to 335 K [10,11]. In both cases the deposited copper salts were converted to copper oxide by calcining in air at 723 K and were then reduced to Cu metal upon activation of the cell in flowing H 2 .…”

Section: Experimental Methodsmentioning

confidence: 99%

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Influence of composition and Cu impregnation method on the performance of Cu/CeO2/YSZ SOFC anodes

Jung

Hong

et al. 2006

Journal of Power Sources

165

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In this study, we report on how different impregnation procedures affect the distribution and morphology of the Cu component in Cu/CeO 2 /YSZ composite anodes and how this affects anode performance. Two different methods for Cu addition to the porous YSZ anode were investigated: impregnation using aqueous solutions of Cu(NO 3 ) 2 and impregnation using aqueous solutions of Cu(NO 3 ) 2 plus urea. The latter method produced a homogeneous distribution of Cu throughout the anode while the former resulted in a higher concentration of Cu near the exposed surface relative to that in the bulk. Studies of the thermal stability of the deposited copper layers, and the influence of the Cu distribution on cell performance when operating with humidified H 2 as the fuel are also presented. AbstractIn this study we report on how different impregnation procedures affect the distribution and morphology of the Cu component in Cu/CeO 2 /YSZ composite anodes and how this affects anode performance. Two different methods for Cu addition to the porous YSZ anode were investigated: impregnation using aqueous solutions of Cu(NO 3 ) 2 and impregnation using aqueous solutions of Cu(NO 3 ) 2 plus urea. The latter method produced a homogeneous distribution of Cu throughout the anode while the former resulted in a higher concentration of Cu near the exposed surface relative to that in the bulk. Studies of the thermal stability of the deposited copper layers, and the influence of the Cu distribution on cell performance when operating with humidified H 2 as the fuel are also presented.

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Section: Experimental Methodsmentioning

confidence: 99%

“…In this case the morphology of the initial copper deposits is controlled by the drying process as will be shown below this method does not produce a uniform distribution of Cu in the anode. In the latter method in which urea is included in the impregnation solution, the following reactions take place upon heating to ~350 K [10,11].…”

Section: Introductionmentioning

confidence: 99%

Influence of composition and Cu impregnation method on the performance of Cu/CeO2/YSZ SOFC anodes

Jung

Hong

et al. 2006

Journal of Power Sources

165

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“…ZnO, results in catalysts that are easier to reduce than their unpromoted counterparts [17][18][19].…”

Section: -11-2017mentioning

confidence: 99%

Low-temperature methanol steam reforming kinetics over a novel CuZrDyAl catalyst

Silva

Mateos-Pedrero

Ribeirinha

et al. 2015

Reac Kinet Mech Cat

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A kinetic study within the low-temperature methanol steam reforming (MSR) reaction range (170 ºC -200 ºC) was performed over a novel CuZrDyAl catalyst. The physicochemical and catalytic properties of the CuZrDyAl catalyst were compared with those of a conventional CuO/ZnO/Al 2 O 3 (G66 MR, Süd-Chemie) sample, taken as reference. The in-house catalyst displays better performances, in terms of methanol conversion and H 2 production, than the reference G66 MR sample.Interestingly, the in-house catalyst is significantly more selective (namely, yielding lower CO concentration) than the commercial one, which gives extra interest for producing fuel cell grade hydrogen. Physicochemical characterization evidences that the in-house catalyst have improved reducibility of copper species compared with the G66-MR, which might account for its better performances.The parameters of a simple power-law equation and two mechanistic kinetic models were determined by non-linear regression, minimizing the sum of the residual squares; the best fitting with the experimental data was obtained when using Model 3, based on the reported work from Peppley et al. [10] for the commercial CuO/ZnO/Al 2 O 3 .This article was published in Reaction Kinetics, Mechanisms and Catalysis, 115(1), 321-339, 2015 http://dx.doi.org/10.1007/s11144-015-0846-z 03-11-2017 2 Noteworthy, is the scarce number of MSR kinetic studies at such lower temperature range.

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“…Using the SPC technique, active and thermally stable catalysts were produced for reforming reactions involving methane [17][18][19][20][21][22] and methanol. [23] The microemulsion synthesis route shows interesting advantages related to the possibility of controlling properties such as particle size distribution and morphology. Particles with a narrow nanosize distribution can often be achieved in this way with consequent benefits for catalytic performances.…”

Section: Introductionmentioning

confidence: 99%

Embedded Phases: A Way to Active and Stable Catalysts

et al. 2010

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Industrial catalysts are typically made of nanosized metal particles, carried by a solid support. The extremely small size of the particles maximizes the surface area exposed to the reactant, leading to higher reactivity. Moreover, the higher the number of metal atoms in contact with the support, the better the catalyst performance. In addition, peculiar properties have been observed for some metal/metal oxide particles of critical sizes. However, thermal stability of these nanostructures is limited by their size; smaller the particle size, the lower the thermal stability. The ability to fabricate and control the structure of nanoparticles allows to influence the resulting properties and, ultimately, to design stable catalysts with the desired characteristics. Tuning particle sizes provides the possibility to modulate the catalytic activity. Unique and unexpected properties have been observed by confining/embedding metal nanoparticles in inorganic channels or cavities, which indeed offers new opportunities for the design of advanced catalytic sytems. Innovation in catalyst design is a powerful tool in realizing the goals of more green, efficient and sustainable industrial processes. The present Review focuses on the catalytic performance of noble metal‐ and non precious metal‐based embedded catalysts with respect to traditional impregnated systems. Emphasis is dedicated to the improved thermal stability of these nanostructures compared to conventional systems.

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Active Cu/ZnO and Cu/ZnO/Al2O3 catalysts prepared by homogeneous precipitation method in steam reforming of methanol

Cited by 220 publications

References 17 publications

Influence of composition and Cu impregnation method on the performance of Cu/CeO2/YSZ SOFC anodes

Influence of composition and Cu impregnation method on the performance of Cu/CeO2/YSZ SOFC anodes

Low-temperature methanol steam reforming kinetics over a novel CuZrDyAl catalyst

Embedded Phases: A Way to Active and Stable Catalysts

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