Preparation of copper catalyst washcoats for methanol steam reforming in microchannels based on nanoparticles
Preparation of copper catalyst washcoats for methanol steam reforming in microchannels based on nanoparticles
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DOI：
10.1016/j.apcata.2005.02.036
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发表时间：
2005-06
影响因子：
5.5
通讯作者：
P. Pfeifer;K. Schubert;G. Emig
中科院分区：
文献类型：
--
作者：
P. Pfeifer;K. Schubert;G. Emig
微结构反应器可以很好地满足汽车燃料电池甲醇水蒸气重整制氢的快速负荷变化需求。然而，在微米尺寸中催化剂的掺入是困难的。通过使用分散的纳米颗粒，开发了洗涂程序，并基于铜催化剂体系进行了解释。在高能球磨（干混）或将粉末分散在纤维素衍生物的溶液中（湿混）期间检查CuO颗粒与其它必要材料如ZnO的混合。对于后一种技术，使用激光衍射研究了纯物质的团聚体和再团聚的剪切。通过吸附实验和X-射线衍射分析确定了球磨对颗粒尺寸的影响。所有混合物通过程序升温还原（TPR）、随后测量Cu（0）粒度（X射线衍射）来表征。采用基于X射线结构分析的特殊方法测定混合质量。这些催化剂性质与所进行的催化剂活性/降解的附加测量之间的关系是明显的。
The demand of fast load alternations for hydrogen generation by methanol steam reforming for automotive fuel cell application may be met in an excellent manner by microstructured reactors. However, catalyst incorporation is difficult in the micrometer size. By the use of dispersed nanoparticles a washcoating procedure was developed and is explained on the basis of a copper catalyst system. The mixing of CuO particles with other necessary materials like ZnO was examined during high energy ball milling (dry mixing) or dispersing the powders in a solution of cellulose derivatives (wet mixing). For the latter technique the shearing of agglomerates and re-agglomeration were investigated for the pure substances using laser diffraction. The influence of ball milling on particle sizes was determined by adsorption experiments and X-ray diffraction. All mixtures were characterized by temperature programmed reduction (TPR) followed by the measurement of the Cu(0) particle size (X-ray diffraction). A special method based upon X-ray structure analysis was applied for determination of the mixing quality. The relationship between these catalyst properties and additional measurements of the catalyst activity/degradation done was obvious.