Catalytic Performance of Microtube-type Copper-based Catalyst for Methanol Steam Reforming Prepared on the Inner Wall of an Aluminum Tube by Electroless Plating
Catalytic Performance of Microtube-type Copper-based Catalyst for Methanol Steam Reforming Prepared on the Inner Wall of an Aluminum Tube by Electroless Plating
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DOI：
10.1016/j.apcata.2005.08.015
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发表时间：
2005-11
影响因子：
5.5
通讯作者：
C. Fukuhara;Y. Kamata;A. Igarashi
中科院分区：
文献类型：
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作者：
C. Fukuhara;Y. Kamata;A. Igarashi
为了构建用于多相催化反应的高性能微反应器，必须在微通道上制备具有高表面积的多孔催化壁。本研究以制备这种催化壁为目的，在直径为微米级的铝管内壁上，通过化学镀法制备了镀有铜基组分的微通道。化学镀包括用氯化氢溶液活化铝管内壁、置换镀锌、中间镀铁和化学还原镀铜。每个工艺溶液通过吸入泵系统流入铝管。研究了镀槽内甲醇的物理化学性质和蒸汽重整性质。镀壁表面和截面的扫描电镜（SEM）照片显示，本研究中使用的制备制备的催化组分膜厚约为100μm，并多孔沉积在微管的内表面。元素分析表明，镀的墙壁由铜和锌组成，后者在从主体到墙壁表面的广泛区域内被检测到。空气氧化微管型铜基催化剂的甲醇重整活性明显高于氢还原催化剂，在160℃、450mm通道下，转化率为100%，产氢量约为0.07mol/h。即使氧化后的催化剂活性下降，也可以通过再氧化恢复其初始活性。再氧化恢复活性可重复进行。结果表明，本研究制备的微管型催化剂对微转化炉具有较高的催化性能。
In order to construct a high-performance microreactor for conducting heterogeneous catalytic reactions, one must prepare a porous catalytic wall with high surface area on the microchannel. In this study, with the purpose of preparing such a catalyzed wall, microchannels plated with copper-based components by electroless plating were prepared on the inner walls of aluminum tubes with micron-order diameter. The electroless plating consisted of an activation of the inner walls of aluminum tubes by hydrogen chloride solution, a displacement plating of zinc, an intermediate plating of iron, and chemical reduction plating of copper. Each process solution was flowed into the aluminum tube by a suction pump system. The physicochemical properties and the steam reforming properties of methanol for the plated channel were then investigated. Scanning electron microscopy (SEM) photographs of the surface and section of the plated wall showed that the preparation used in this study produced catalytic components with a film thickness of about 100μm that were deposited porously on the inner surfaces of microtubes. An elemental analysis indicated that the plated walls consisted of copper and zinc, with the latter being detected in a wide area from the bulk to the surface of the wall. The microtube-type copper-based catalyst oxidized by air was significantly higher in activity of methanol reforming than that reduced by hydrogen, indicating that the conversion was 100% and the hydrogen production was about 0.07mol/h at 160°C with the channel length of 450mm. Even after the activity of the oxidized catalyst declined, its initial activity could be restored by reoxidation. The activity restoration by reoxidation could be repeated. These results show that the microtube-type catalysts prepared in this study have high catalytic performance for microreformer.