The influence of feeding point in conventional stirred tank reactor and flow characteristics in micro‐reactor on the microstructure of Cu‐ZnO catalyst was studied. Cu‐Zn distribution in co‐precipitate was characterized by EDS and Zn fraction in zincian malachite was estimated from the 20 peak shift in XRD pattern. The theory analysis and experimental results, combining with measurement of segregation index, show that the contact pattern and mixing of reactants in precipitation process determine the uniformity of Cu‐Zn distribution in initial co‐precipitates at the micro‐scale. The uniform Cu‐Zn distribution is favorable for the formation of zincian malachite with higher Zn fraction, whereas the uneven distribution could lead to either zincian malachite with lower Zn fraction or aurichalcite‐like nonmalachite. These differences in the precursor structure act on subsequent calcination and reduction, as well as their products. Along this path, mixing affects the evolution of the catalyst microstructure by means of Cu‐Zn distribution. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2647–2654, 2018

中文翻译：

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混合对Cu-ZnO催化剂共沉淀和微观结构演变的影响

研究了常规搅拌釜反应器中进料点和微反应器流动特性对Cu-ZnO催化剂微观结构的影响。用EDS表征共沉淀物中的铜锌分布，并根据20个样品估算锌孔雀石中的锌含量 XRD图谱中的峰移。理论分析和实验结果结合偏析指数的测量表明，沉淀过程中接触方式和反应物的混合决定了微观共沉淀物中初始铜-锌分布的均匀性。均匀的Cu-Zn分布有利于形成具有较高Zn含量的锌孔雀石，而分布不均则可能导致具有较低Zn含量的锌孔雀石或类似金刚玉的非孔雀石。前体结构的这些差异会影响后续的煅烧和还原以及它们的产物。沿着这条路径，混合会通过Cu-Zn分布影响催化剂微观结构的演变。©2018美国化学工程师学会AIChE J，64：2647–2654，2018