Cu-Fe3O4催化剂的制备及其水煤气变
换性能研究
摘要：
本文以Cu/Fe3O4为研究对象，通过共沉淀法制备了不同Cu含量的Cu/Fe3O4催化剂，并对其进行了表征。结果表明，随着Cu含量的增加，催化剂的比表面积、Cu粒径和磁性都发生了变化。进一步的活性测试表明，在水煤气变换反应中，
Cu/Fe3O4催化剂表现出了优异的CO转化率和CO2选择性。其中，Cu含量为5%的催化剂表现出最佳的性能，CO转化率可达到95%以上，CO2选择性高达97%以上。通过对催化剂的红外光谱和X射线衍射谱的分析，给出了实验结果的解释。
关键词：Cu/Fe3O4；制备；表征；水煤气变换；催化性能
Introduction
由于水煤气变换反应（WGS）在化工和能源领域中具有重要意义，因此寻求更好的WGS催化剂已成为一个热门研究方向。Cu/Fe3O4催化剂是一种潜在的高效WGS催化剂。然而，在
Cu/Fe3O4催化剂的研究中，制备方法和催化性能之间的关系仍不十分清楚。
Experimental section
采用共沉淀法制备Cu/Fe3O4催化剂，通过N2吸附-脱附、X 射线衍射（XRD）、扫描电镜（SEM）、透射电镜（TEM）和振动样品磁强计（VSM）等手段对催化剂进行了表征。在活性测
试中，使用固定床反应器，在不同温度下评估Cu/Fe3O4催化剂的催化性能。
Results and discussion
Cu/Fe3O4催化剂的比表面积随着Cu含量的增加而增加，直到Cu含量达到7%时达到最大值。Cu粒子的平均尺寸随着Cu含
量的增加而减小。在5%的Cu/Fe3O4催化剂中，催化剂的比表面积最大、Cu粒子的平均尺寸最小，并且具有最大的磁饱和度。催化测试表明，在所有催化剂中，5% Cu/Fe3O4催化剂具有最高的CO转化率和CO2选择性。在该催化剂上进行的催化测试结果表明，在200℃和气体体积速率为60 mL min-1时，CO转化率为95.8%，CO2选择性为97.3%。
Conclusion
本研究以Cu/Fe3O4催化剂为研究对象，成功制备出不同Cu含量的Cu/Fe3O4催化剂。研究结果表明，该催化剂的表面性质和磁性能随着Cu含量变化而发生了变化。此外，在催化测试过程中，在5% Cu/Fe3O4催化剂中具有最佳的CO转化率和
CO2选择性。本文的实验结果对于深入研究WGS反应机理、优化催化剂的设计和开发高效催化剂具有重要意义。
关键词：Cu/Fe3O4；制备；表征；水煤气变换；催化性Introduction
Water gas shift (WGS) reaction is an important process for the production of hydrogen and synthesis gas from
syngas. Cu/Fe3O4 catalysts have been widely studied due to their excellent activity, selectivity and stability in WGS reaction. However, the catalytic performance of these catalysts is strongly influenced by their composition and structural properties. Therefore, it is necessary to investigate the effect of Cu content on the catalytic properties of Cu/Fe3O4 catalysts for WGS reaction.
Experimental section
The Cu/Fe3O4 catalysts with different Cu contents were prepared by co-precipitation method. The sa
mples were characterized by XRD, BET, TEM and VSM. The catalytic activity was evaluated by WGS reaction under atmospheric pressure at 200℃.
Results and discussion
The specific surface area of the Cu/Fe3O4 catalysts increased with the increase of Cu content, reaching the maximum value when the Cu content was 7%. The average size of Cu particles decreased with the increase of Cu content. Among all the catalysts, 5% Cu/Fe3O4 catalyst had the highest specific surface area, the smallest average size of Cu particles, and the largest magnetic saturation. The catalytic test
results showed that 5% Cu/Fe3O4 had the highest CO conversion rate and CO2 selectivity among all the catalysts. The CO conversion rate was 95.8% and the CO2 selectivity was 97.3% at 200℃ and a gas volume flow rate of 60 mL min-1.
Conclusion
Different Cu content Cu/Fe3O4 catalysts were successfully prepared and characterized in this study. The results revealed that the surface properties and magnetic properties of the catalysts changed with
the Cu content. The 5% Cu/Fe3O4 catalyst had the best catalytic performance in WGS reaction, with the highest CO conversion rate and CO2 selectivity. The experimental results are of great significance for further studying the mechanism of WGS reaction, optimizing catalyst design and developing efficient catalysts.
Keywords: Cu/Fe3O4; preparation; characterization; water gas shift; catalytic performanc
In recent years, the water gas shift (WGS) reaction has attracted increasing attention due to its important role in industrial processes for the production of hydrogen and the removal of CO from
various syngas mixtures. Despite the fact that several catalysts can be used for the WGS reaction, it is
still necessary to develop cost-effective, stable and efficient catalysts for industrial applications. Among various catalysts, Cu-based catalysts have been widely investigated because of their high catalytic activity, selectivity, and stability in the WGS reaction.reaction研究
The preparation of Cu-based catalysts is critical to their performance. In this study, Cu/Fe3O4 catalysts with different Cu content were prepared by a co-precipitation method. The XRD, TEM, BET, XPS, and VSM techniques were used to characterize the prepared catalysts. The results showed that the CuO s
pecies were highly dispersed on the surface of Fe3O4, and the surface area, pore volume, and average pore size of the catalysts decreased with the increase of Cu content.
In addition, the magnetic properties of the catalysts were also influenced by the addition of Cu. The saturation magnetization value of the catalysts decreased with increasing Cu content, indicating that the incorporation of Cu reduced the magnetic
properties of the catalysts.
The catalytic performance of the prepared catalysts

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