A_2B_2O_7 pyrochlore compounds:A category of potential materials for clean energy and environment protection catalysis |
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| Affiliation: | 1. College of Engineering, The Ohio State University, Columbus, OH 43210, USA;2. College of Pharmacy, The University of Michigan, Ann Arbor, MI 48109, USA;3. Department of Earth and Environmental Sciences, The University of Michigan, Ann Arbor, MI 48109, USA;1. Department of Mechanical, Aerospace, Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA;2. Niskayuna High School, Niskayuna, NY 12309, USA;3. Department of Geology and Geophysics, Louisiana State University, LA 70803, USA;1. Centre for Nanoscience and Technology, Pondicherry University, Kalapet Pondicherry 605014, India;2. Materials Physics Division, Indira Gandhi Center for Atomic Research, Kalpakkam 603102, Tamilnadu, India;1. Institute of Applied Chemistry, College of Chemistry, Nanchang University, Nanchang, 330031, PR China;2. Research Institute of Petroleum Processing(RIPP), SINOPEC, 18 Xueyuan Road, Haidian District, Beijing 100083, PR China |
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| Abstract: | A_2B_2O_7 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 A_2 B_2 O_7 pyrochlore compounds,and assist them to develop better catalysts for various reactions. |
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| Keywords: | Crystalline phase change Lattice and surface oxygen vacancies Air pollution control reactions Rare earths |
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