Abstract A2B2O7 pyrochlore is a kind of important functional materials for different purposes, which has been investigated extensively by crystallographers and material scientists. However, the catalytic chemistry of this type of special compounds has rarely been documented, though a few researchers have tried to synthesize some pyrochlore compounds with different chemical compositions for a variety of green energy production and air pollution control reactions in the history. With the expectation to help catalysis scientists to get better acquaintance with, and gain deeper understanding on this type of compounds as heterogeneous catalysts, the major publications over the past several decades have been screened and reviewed in this paper, based also on our own experience of studying on this type of catalytic materials. The crystalline phase transformations of the compounds with the change of the A and B site cations, the phase change's influences on the surface and bulk properties, and their subsequent impact on the catalytic performance for different reactions have been summarized. Furthermore, the future work which needs to be performed to perceive in depth this kind of important materials as catalysts has been proposed and suggested. We trust that this short review contains valuable information, which will provide great help for people to get better cognition for A2B2O7 pyrochlore compounds, and assist them to develop better catalysts for various reactions.

中文翻译：

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A2B2O7烧绿石化合物：一类潜在的清洁能源和环保催化材料

摘要 A2B2O7烧绿石是一种具有不同用途的重要功能材料，受到晶体学家和材料科学家的广泛研究。然而，这类特殊化合物的催化化学却鲜有记载，尽管历史上有少数研究人员尝试合成一些不同化学成分的烧绿石化合物，用于各种绿色能源生产和空气污染控制反应。为了帮助催化科学家更好地了解和更深入地了解这类化合物作为多相催化剂，本文对过去几十年的主要出版物进行了筛选和综述，也是基于我们自己的经验。正在研究这类催化材料。总结了化合物随着A和B位阳离子变化的结晶相变，相变对表面和体积性质的影响，以及它们对不同反应催化性能的后续影响。此外，已经提出并建议了需要进行的未来工作以深入了解这种作为催化剂的重要材料。我们相信，这篇简短的评论包含有价值的信息，将极大地帮助人们更好地认识 A2B2O7 烧绿石化合物，并帮助他们开发出更好的各种反应催化剂。并总结了它们对不同反应的催化性能的后续影响。此外，已经提出并建议了需要进行的未来工作以深入了解这种作为催化剂的重要材料。我们相信，这篇简短的评论包含有价值的信息，将极大地帮助人们更好地认识 A2B2O7 烧绿石化合物，并帮助他们开发出更好的各种反应催化剂。并总结了它们对不同反应的催化性能的后续影响。此外，已经提出并建议了需要进行的未来工作以深入了解这种作为催化剂的重要材料。我们相信，这篇简短的评论包含有价值的信息，将极大地帮助人们更好地认识 A2B2O7 烧绿石化合物，并帮助他们开发出更好的各种反应催化剂。