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<p>The A<sub>2</sub>B<sub>2</sub>O<sub>7</sub> complex oxide exhibits excellent thermal stability, open structure, controllable surface properties, and a diverse range of sub-crystalline phases. Among these phases, the three structures—pyrochlore, disordered defect fluorite, and rare earth C-type—possess intrinsic oxygen vacancies and demonstrate outstanding oxygen ion mobility. Over recent years, they have been used in the fields of thermal catalysis, photocatalysis, and electrocatalysis. This review summarizes the studies over the past fifteen years, with a lot of research results from our lab, in applying this catalytic material for thermal catalytic environment and energy reactions. Based on the reported literatures, four types of sub-crystalline phase structures have been distinguished. The advantages and disadvantages, and applicability of various preparation methods have been summarized. Additionally, the characterization techniques for different sub-crystalline phases have been elucidated. The influence of the fine structures on the active sites and reaction performance has been analyzed in relation to the most common, yet important catalytic reactions. Furthermore, the challenges that must be addressed in future work for this type of catalytic materials in heterogeneous catalysis are discussed. We hope this review can provide some innovative insight for researchers, who are committed to studying A<sub>2</sub>B<sub>2</sub>O<sub>7</sub> catalytic materials, to design high-performance catalysts.</p>

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The preparation, structure characterization and thermocatalytic chemistry of A2B2O7 complex oxides in environment and energy reactions

  • 期刊论文

  • 发表日期：

    2026年1月4日

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  • Shijing Zhang,
  • Junwei Xu,
  • Xiang Wang

摘要

The A2B2O7 complex oxide exhibits excellent thermal stability, open structure, controllable surface properties, and a diverse range of sub-crystalline phases. Among these phases, the three structures—pyrochlore, disordered defect fluorite, and rare earth C-type—possess intrinsic oxygen vacancies and demonstrate outstanding oxygen ion mobility. Over recent years, they have been used in the fields of thermal catalysis, photocatalysis, and electrocatalysis. This review summarizes the studies over the past fifteen years, with a lot of research results from our lab, in applying this catalytic material for thermal catalytic environment and energy reactions. Based on the reported literatures, four types of sub-crystalline phase structures have been distinguished. The advantages and disadvantages, and applicability of various preparation methods have been summarized. Additionally, the characterization techniques for different sub-crystalline phases have been elucidated. The influence of the fine structures on the active sites and reaction performance has been analyzed in relation to the most common, yet important catalytic reactions. Furthermore, the challenges that must be addressed in future work for this type of catalytic materials in heterogeneous catalysis are discussed. We hope this review can provide some innovative insight for researchers, who are committed to studying A2B2O7 catalytic materials, to design high-performance catalysts.