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Research Papers

Micromachined Methanol Reformer for Portable PEM Fuel Cells

[+] Author and Article Information
Taegyu Kim

Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon, 305-701, Korea

Dae Hoon Lee

Emission Control Group,  Korea Institute of Machinery and Materials, 171 Jang-dong, Yuseong-gu, Daejeon, 305-343, Korea

Dae-Eun Park

Division of Electrical Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon, 305-701, Korea

Sejin Kwon1

Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon, 305-701, Koreatrumpet@kaist.ac.kr

1

Corresponding author.

J. Fuel Cell Sci. Technol 5(1), 011008 (Jan 31, 2008) (6 pages) doi:10.1115/1.2784277 History: Received June 16, 2005; Revised January 18, 2007; Published January 31, 2008

Fabrication procedures for a micromethanol reformer including catalyst preparation, coating, and patterning on a wafer are described. Cu-based catalyst was prepared by coprecipitation method. The effects of precipitation conditions on the catalytic activity and adhesion of coated catalyst on the substrate were tested to find the optimum precipitation condition. For coating purposes, the prepared catalyst was ground into powder and mixed with binder in the solvent. Simultaneous precipitation of catalyst and binder on the wafer produced catalyst layer that is uniform and rigidly found to the wafer surface. The amount of coated catalyst on the wafer was 58mgcm2 with a thickness of 30μm. By repetition of coating procedure, catalyst mass up to 15mgcm2 was obtained with increased reactivity. Patterned catalyst layer was obtained by novel lift-off process of polyvinyl alcohol sacrificial layer. A micromethanol reformer was fabricated using a typical lithography procedure including catalyst coating and patterning process. Typical methanol conversion was higher than the conventional packed bed reactor.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

XRD results of a prepared Cu∕ZnO catalyst before and after reduction

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Figure 2

Conversion of methanol for the space time in each catalyst at 300°C and S∕C=1.1.

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Figure 3

Conversion of methanol for reaction temperature in each catalyst at W∕F=66.3kgcats∕mol and S∕C=1.1

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Figure 4

SEM images of the cross section of the catalyst layer coated by precipitation method on the wafer

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Figure 5

Conversion of methanol for the feed rate of reactants in each catalyst layer at 300°C and S∕C=1.1

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Figure 6

Conversion of methanol for reaction temperature in one layer of catalyst at 0.1ml∕h and S∕C=1.1

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Figure 7

Conversion of methanol for the space time in each catalyst at 250°C and S∕C=1.1

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Figure 8

Conversion of methanol for the temperature in each catalyst at W∕F=66.3kgcats∕mol and S∕C=1.1

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Figure 9

SEM images of prepared Cu∕ZnO catalysts, CP30-27, CP80-35, and SP80-33

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Figure 10

Schematic of fabrication process of a prototype micromethanol reformer; in reactor body process, Steps 1–6, wet anisotropic etching process and Steps 7–10, coating and patterning process of catalyst layer. Catalyst layer is removed by Step 9.

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Figure 11

Result of catalyst pattening by the lift-off process of PVA sacrificial layer

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Figure 12

Fabricated results of a microcatalytic reactor: (a) reactor body, (b) heater layer, and (c) assembly of reactor layers for reforming test

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Figure 13

The conversion performance of the fabricated micromethanol reformer and the packed-bed reactor at the reaction temperature=300°C, S∕C=1.1

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