Preparation of Cu/ZnO/Al2O3 catalyst for a micro methanol reformer

Kawamura, Yoshihiro; Yamamoto, Kazuto; Ogura, Naotsugu; Katsumata, Takashi; Igarashi, Akira

doi:10.1016/j.jpowsour.2005.02.030

Cited by 46 publications

(36 citation statements)

References 15 publications

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“…Jiang et al 22) also found, by referring to the reaction mechanism proposed by Takahashi et al 26) , that carbon 3). The authors 14) found that the concentration of carbon monoxide in the reformed gases over the high-performance Cu/ZnO/Al2O3 catalyst used in this study also did not exceed the equilibrium concentration, which agrees that methanol reforming over the Cu/ZnO/ Al2O3 catalyst proceeds along with the mechanism proposed by Takahashi et al 26) . Further, the authors 14) observed no methane production over the Cu/ZnO/ Al2O3 catalyst, therefore the methanation was not considered in the present investigation.…”

Section: Determination Of Microchannel Design For Miniaturized Methansupporting

confidence: 88%

“…The Cu/ZnO/Al2O3 catalysts were prepared by coprecipitation 14) . Al2O3 was prepared by precipitation as a third component.…”

Section: Preparation Of Cu/zno/al2o3 Catalyst With Superior Catalyticmentioning

confidence: 99%

“…Therefore, u0 2.3 m s -1 was set as the boundary condition for Eqs. (4) and (5), and the inlet temperature was set at 280 on the basis of catalytic activity tests 14) . For a reforming temperature of 280 , calculations using thermodynamic data gave a fluid density and fluid specific heat of the gas composition at the inlet of 0.49 kg m -3 and 2.02 10 3 J kg -1 K -1 , respectively.…”

Section: Determination Of Microchannel Design For Miniaturized Methanmentioning

confidence: 99%

“…This article reviews the development of catalysts and microreactors for hydrogen production by methanol steam reforming on the basis of researches 14) 19) of the group of authors conducted from 2000 to 2008.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen Production by Methanol Steam Reforming Using Microreactor

Kawamura¹,

Ogura²,

Igarashi³

2013

J. Jpn. Petrol. Inst.

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A microreactor technology, in which a microchannel is used as a catalytic reaction field in order to supply hydrogen to a small polymer electrolyte fuel cell (PEFC) for portable electronic devices, was described. The reduction of heat loss in the microreactor is the primary requirement for improving system efficiency, since heat release in microreactors is higher than in conventional reactors due to the increased specific surface area. Therefore, the methanol steam reforming, operated below 300 , is an appropriate process for the hydrogen production using the microreactor. First, the high-performance Cu/ZnO/Al2O3 catalyst for methanol reforming at low temperature was developed under the optimized preparation condition. The miniaturized methanol reformer was then developed to utilize this Cu/ZnO/Al2O3 catalyst. The length of the microchannel was determined based on one-dimensional mass and heat balance analyses. The microreactor was fabricated from silicon and glass substrates using a number of microfabrication techniques. Methanol reforming using this reactor has been demonstrated to reach the levels necessary to power a 1 W-class small PEFC system. The multilayered integrating the miniature methanol reformer with a CO remover, a catalytic combustor as a heat source for methanol reforming, vaporizers, and several necessary functional elements for hydrogen production has also been successfully fabricated. Finally, the microreactor system has been demonstrated to produce hydrogen at a rate sufficient to generate electrical power of 2.5 W.

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Section: Determination Of Microchannel Design For Miniaturized Methansupporting

confidence: 88%

“…The Cu/ZnO/Al2O3 catalysts were prepared by coprecipitation 14) . Al2O3 was prepared by precipitation as a third component.…”

Section: Preparation Of Cu/zno/al2o3 Catalyst With Superior Catalyticmentioning

confidence: 99%

Section: Determination Of Microchannel Design For Miniaturized Methanmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hydrogen Production by Methanol Steam Reforming Using Microreactor

Kawamura¹,

Ogura²,

Igarashi³

2013

J. Jpn. Petrol. Inst.

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“…By means of temperature programmed XANES investigations at the Cu K-edge the shoulder which appeared at lower temperature side in the TPR signal was assigned to the appearance of Cu 2 O as an intermediate phase during the reduction of Cu(II) to Cu(0) as it was also found for other Cu based mixed oxides [42]. Previous investigations concerning the reducibility of copper based catalysts for methanol synthesis and MSR have revealed that good reducibility is associated with a high activity of the corresponding catalyst [43] and [44]. In addition to the low reduction temperature, the shape of the TPR profile of sample CZA-1 indicates a homogeneous microstructure of small and uniformly distributed copper particles [14].…”

Section: Microstructure Of Cu In Cu/zno/al 2 O 3 Catalystsmentioning

confidence: 57%

Microstructural characterization of Cu/ZnO/Al2O3 catalysts for methanol steam reforming—A comparative study

Kurr

Kasatkin

Girgsdies

et al. 2008

Applied Catalysis A: General

113

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Microstructural characteristics of various real Cu/ZnO/Al 2 O 3 catalysts for methanol steam reforming (MSR) were investigated by in situ X-ray diffraction (XRD), in situ X-ray absorption spectroscopy (XAS), temperature programmed reduction (TPR) and electron microscopy (TEM). Structure-activity correlations of binary Cu/ZnO model catalysts were compared to microstructural properties of the ternary catalysts obtained from in situ experiments under MSR conditions. Similar to the binary system, in addition to a high specific copper surface area the catalytic activity of Cu/ZnO/Al 2 O 3 catalysts is determined by defects in the bulk structure. The presence of lattice strain in the copper particles as the result of an advanced Cu-ZnO interface was detected only for the most active Cu/ZnO/Al 2 O 3 catalyst in this study. Complementarily, a highly defect rich nature of both Cu and ZnO has been found in the short-range order structure (XAS). Conventional TPR and TEM investigations confirm a homogeneous microstructure of Cu and ZnO particles with a narrow particle size distribution. Conversely, a heterogeneous microstructure with large copper particles and a pronounced bimodal particle size distribution was identified for the less active catalysts. Apparently, lattice strain in the copper nanoparticles is an indicator for a homogeneous microstructure of superior Cu/ZnO/Al 2 O 3 catalyst for methanol chemistry.

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Conversion of Biomass on Solid Catalysts

Gallezot

Kiennemann

2008

Handbook of Heterogeneous Catalysis

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The sections in this article are Introduction Conversion of Biomass to Biobased Products Strategy for Biomass Conversion to Chemicals Catalytic Conversion of Terpenes Catalytic Conversion of Triglycerides Catalytic Conversion of Triglycerides to Surfactants Catalytic Conversion of Triglycerides to Lubricants Catalytic Conversion of Triglycerides to Polymers Hydrogenation of Fatty Acids Esters Catalytic Conversion of Glycerol Conversion of Glycerol to Oxidized Compounds Conversion of Glycerol to Polyglycerols and Derivatives Hydrogenolysis of Glycerol to 1,2‐ and 1,3‐Propanediol Catalytic Conversion of Carbohydrates Hydrogenation and Hydrogenolysis of Carbohydrates Catalytic Oxidation of Carbohydrates Cascade Catalysis and Multistep, One‐Pot Conversion Catalytic Conversion of Carbohydrate Derivatives Furan Derivatives Conversion of Platform Molecules Produced by Fermentation Catalytic Conversion of Lignocellulosic Materials Concluding Remarks Conversion of Biomass to Heating and Transportation Fuels Conversion of Vegetable Oils Transesterification to Biodiesel Cracking and Steam Reforming of Vegetable Oils Biochemical/Biological Conversion of Biomass Anaerobic Digestion Fermentation and Hydrolysis Catalytic Reforming of Biomass Derivatives Catalytic Reforming of Methanol Catalytic Steam Reforming of Ethanol A Oxide Catalysts B Oxide‐Supported Transition Metals C Oxide‐Supported Noble Metals Thermochemical Conversion of Biomass Combustion Pyrolysis Gasification A Alkali Metals B Ores C Oxide‐Supported Metals Concluding Remarks

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Preparation of Cu/ZnO/Al2O3 catalyst for a micro methanol reformer

Cited by 46 publications

References 15 publications

Hydrogen Production by Methanol Steam Reforming Using Microreactor

Hydrogen Production by Methanol Steam Reforming Using Microreactor

Microstructural characterization of Cu/ZnO/Al2O3 catalysts for methanol steam reforming—A comparative study

Conversion of Biomass on Solid Catalysts

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