Speciation of CuO in MCM-41 during oxidation of naphthalene |
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| Affiliation: | 1. Department of Environmental Engineering, National Cheng Kung University, Tainan City 70101, Taiwan;2. Department of Civil and Environmental Engineering, Lehigh University, Bethlehem, PA, USA;3. Department of Occupation Safety and Health, Chung Hwa College of Medical Technology, Tainan County 71703, Taiwan;4. Department of Industrial Safety and Hygiene, Chung Hwa College of Medical Technology, Tainan County 71703, Taiwan;1. School of Physics, University of Melbourne, Victoria 3010, Australia;1. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, Jilin, China;2. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, Hubei, China;3. State Key Laboratory of Catalytic Materials and Reaction Engineering, Research Institute of Petroleum Processing, SINOPEC, Beijing 100083, China;1. Departamento de Química, Universidade Federal de Lavras, 37.200-000, Lavras, MG, Brazil;2. Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001, Lisboa, Portugal;3. Departamento de Engenharia, Universidade Federal de Lavras, 37.200-000, Lavras, MG, Brazil;1. State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, China;2. Key Laboratory of Coal Science and Technology, Taiyuan University of Technology, Ministry of Education, Taiyuan 030024, China |
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| Abstract: | By extended X-ray absorption fine structural (EXAFS) spectroscopy, copper oxide clusters with a square-plane structure are found in the channels of mesoporous molecular sieve MCM-41. Bond distances of Cu–O and Cu–Cu are 1.90 and 2.80 Å, respectively. Oxidation of naphthalene at 723 K for 4 h in MCM-41 leads to structural perturbation of the clusters (e.g., Cu–O: −0.02 Å and Cu–Cu: +0.02 Å) with little change in their coordination numbers. |
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