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催化剂的设计、合成和结构调控是获得优异性能的关键.传统的策略主要是尽量减小催化剂颗粒尺寸以增加活性中心的数目,即尺寸效应.近年来,材料科学的快速发展使得在纳米尺度上调变催化剂的尺寸和形貌成为可能,特别是通过形貌调控可暴露更多的高活性晶面,大幅度提高催化性能,即纳米催化中的形貌效应.因此,调节催化剂的尺寸与形貌可以单独或协同优化材料的性能.氧化铈作为催化剂的重要组分与结构、电子促进剂被广泛应用于多相催化剂体系.本文总结了近期氧化铈材料形貌可控合成的进展,包括主要的合成策略和表征方法;进而分析了氧化铈和金-氧化铈催化材料的形貌效应,指出金-氧化铈之间独特的相互作用与载体形貌密切相关;阐述了氧化铈纳米材料因暴露晶面的差异而获得不同催化性能的化学机制.
Catalyst design, synthesis and structural control is the key to obtain excellent performance.The traditional strategy is to minimize the catalyst particle size to increase the number of active centers, the size effect.In recent years, the rapid development of materials science makes the nanometer scale up It is possible to change the size and morphology of the catalyst, in particular, the more highly active crystal face can be exposed through the morphology control, thereby greatly improving the catalytic performance, that is, the topography in the nano-catalysis. Therefore, the size and morphology of the catalyst The performance of materials can be optimized alone or in combination.Ceerosilicate (Ceria) is an important component and structure of catalysts, and electron accelerators are widely used in heterogeneous catalyst systems.This paper summarizes the recent progress of controllable synthesis of cerium oxide materials, including the major Synthesis strategy and characterization method. The morphological effects of cerium oxide and cerium oxide-cerium catalyst materials were analyzed. It is pointed out that the unique interaction between cerium oxide and cerium oxide is closely related to the morphology of the support. The effect of cerium oxide- The difference in surface chemistry results in different catalytic properties.