CeO2纳米管限域金催化剂的设计和催化性能研究

金催化是十多年来引起研究人员高度重视的研究领域，但由于金纳米颗粒粒径小，容易聚集，热稳定性差，使得该类催化剂难以广泛应用。本申请项目以提高金催化剂热稳定性为前提，主要采用水热法制备CeO2纳米管，利用纳米管内腔独特空间结构实现对纳米金催化剂的限域，提高其热稳定性。纳米管内腔的特殊的电子性能和吸附性能也将对提高催化活性起到很大的促进作用。采用CO氧化反应为探针，考察催化剂的催化性能和动力学行为。利用TEM、XPS、TPD-MS、ICP、Raman、TGA、XRD等表征手段对催化剂进行理论分析，阐述纳米管在催化中所起作用的内在因素，探寻其科学问题。借助于理论计算，以期获得CeO2纳米管对金催化剂进行限域、提高催化性能的理论依据，分析纳米管曲面效应对催化性能的影响。本项目工作将获得一种性能优良的Au/CeO2纳米管催化剂，为丰富和完善相关领域的研究提供有益的科学数据和结论。

Gold catalysis is an important research area, which have attracted great attention in the past ten years. While the gold catalysts has not been widely used due to its poor thermal stability because of smaller gold particles size . In order to improve the thermal stability of the gold catalysts, this project proposed to prepare the cerium oxide nanotubes via hydrothermal methods, and try to confine the gold particles into the inner space of the nanotubes. The special electron and adsorption properties of the inner space of the cerium oxide nanotubes may improve the thermal stability and the catalytic performance of the catalysts. CO oxidation reaction will be carried out as probe reaction to investigate the performance and the thermodynamics. The TEM, XPS, TPD-MS, ICP, Raman, TGA and XRD will be employed to characterize the catalysts to discover the catalytic functions of the nanotubes. Theoretical computations will be performed to investigate the effects of the curved surface of the cerium oxide nanotubes, to acquire the theoretical basis for the confinement and the improved performance of the catalysts. With the implementation of the present project, a new excellent Au/CeO2 nanotube catalysts will be acquired, which could provide useful scientific data and conclusions to enrich the related fields.