Catalytic properties of plate-type copper-based catalysts, for steam reforming of methanol, on an aluminum plate prepared by electroless plating
Catalytic properties of plate-type copper-based catalysts, for steam reforming of methanol, on an aluminum plate prepared by electroless plating
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DOI：
10.1016/j.apcata.2004.06.034
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发表时间：
2004-10-08
影响因子：
5.5
通讯作者：
Igarashi, A
中科院分区：
文献类型：
--
作者：
Fukuhara, C;Ohkura, H;Igarashi, A
甲醇的蒸汽重整作为一种为燃料电池产生氢气的反应引起了人们的兴趣。由于它涉及相对大的吸热反应并且将作为车载反应应用，因此重整器需要有效的热能交换、快速的负载响应和减小的尺寸。为了开发用于壁式甲醇重整装置的板式重整催化剂，我们采用化学镀法在铝基体上制备了板式铜基催化剂，并考察了其重整性能。结果表明，所制备的催化剂具有不同的重整性能取决于在中间镀中使用的金属物种。一种片状（CuFe）-Fe-./中间镀铁Zn催化剂表现出较高的重整性能。通过反应前的氧化提高了催化剂的活性。氧化态（CuFe）-Fe-./ Zn催化剂在低温区的活性与工业颗粒重整催化剂相当，在高温区的活性高于工业颗粒重整催化剂。通过对（CuFe）-Fe-./ Zn催化剂时，并入镀层中的锌通过氧化从本体移动到表面，并且由于锌的存在接近铜而形成甲醇重整的活性位点。锌的这种移动被认为是改善（CuFe）-Fe-的重整的因素。Zn催化剂即使在氧化的（CuFe）-Fe-./ Zn催化剂已衰退，通过再氧化可恢复到其初始活性。这种通过再氧化的活性恢复可以重复。(C)2004 Elsevier B. V.保留所有权利。
Steam reforming of methanol is attracting interest as a reaction that generates hydrogen for fuel cells. As it involves a relatively large endothermic reaction and would be applied as an on-board reaction, the reformer requires effective exchange of heat energy, quick load response and downsized dimensions. The wall-type reactor is one of the reactors that can meet these demands.In order to develop a plate-type reforming catalyst for the wall-type methanol reformer, we prepared plate-type copper-based catalysts on an aluminum substrate by electroless plating and examined their reforming properties. Results showed that the prepared catalysts had different reforming properties depending on the metal species used in the intermediate plating. A plate-type (CuFe)-Fe-./Zn catalyst on an intermediate iron plating exhibited high reforming properties. The activity of this catalyst was improved by oxidation before the reaction. The activity of the oxidized (CuFe)-Fe-./Zn catalyst was nearly equal to that of the commercial granular reforming catalyst in low temperature regions and was higher than the activity of this type in high regions. According to measurements of physicochemical properties for the (CuFe)-Fe-./Zn catalyst, the zinc incorporated in the plated layer moved from the bulk to the surface by oxidation, and active sites for methanol reforming were formed because of the presence of zinc in proximity to copper. Such movement of zinc was thought to be a factor for improvement in reforming of the (CuFe)-Fe-./ Zn catalyst. Even after the activity of the oxidized (CuFe)-Fe-./Zn catalyst had declined, it could be restored to its initial activity by reoxidation. Such activity restoration by reoxidation could be repeated. (C) 2004 Elsevier B.V. All rights reserved.