Systematic Study of Cr3+ Substitution into Octahedra-Based Microporous Aluminoborates
文献类型：期刊论文
| 作者 | Li, Qiaoqi1; Lin, Cong1; Zhou, Zhengyang1; Ju, Jing2; Li, Guobao2; Lin, Jianhua2; Gao, Wenliang1; Cong, Rihong1; Yang, Tao1 |
| 刊名 | INORGANIC CHEMISTRY
 |
| 出版日期 | 2014-06-02 |
| 卷号 | 53期号:11页码:5600-5608 |
| ISSN号 | 0020-1669 |
| DOI | 10.1021/ic500352g |
| 英文摘要 | Single crystals of pure aluminoborate PKU-1 (Al3B6O11(OH)(5)center dot nH(2)O) were obtained, and the structure was redetermined by X-ray diffraction. There are three independent Al atoms in the R3 structure model, and Al3 locates in a quite distorted octahedral environment, which was evidenced by Al-27 NMR results. This distortion of Al3O(6) octahedra release the strong static stress of the main framework and leads to a symmetry lowering from the previously reported R (3) over bar to the presently reported R3. We applied a pretreatment to prepare Al3+/Cr3+ aqueous solutions; as a consecquence, a very high Cr3+-to-Al3+ substitution content (similar to 50 atom %) in PKU-1 can be achieved, which is far more than enough for catalytic purposes. Additionally, the preference for Cr3+ substitution at the All and Al2 sites was observed in the Rietveld refinements of the powder X-ray data of PKU-1:0.32Cr(3+). We also systematically investigated the thermal behaviors of PKU-1:xCr(3+) (0 <= x <= 0.50) by thermogravimetric-differential scanning calorimetry, in situ high-temperature XRD in vacuum, and postannealing experiments in furnace. The main framework of Cr3+-substituted PKU-1 could be partially retained at 1100 degrees C in vacuum. When 0.04 <= x <= 0.20, PKU-1:xCr(3+) transferred to the PKU-5:xCr(3+) (Al4B6O15:xCr(3+)) structure at similar to 750 degrees C by a 5 h annealing in air. Further elevating the temperature led to a decomposition into the mullite phase, Al4B2O9:xCr(3+). For x > 0.20 in PKU-1:xCr(3+), the heat treatment led to a composite of Cr3+-substituted PKU-5 and Cr2O3, so the doping upper limit of Cr3+ in PKU-5 structure is around 20 atom %. |
| 语种 | 英语 |
| WOS记录号 | WOS:000336942500026 |
| 出版者 | AMER CHEMICAL SOC |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/52871]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Cong, Rihong |
| 作者单位 | 1.Chongqing Univ, Coll Chem & Chem Engn, Chongqing 400044, Peoples R China 2.Peking Univ, Beijing Natl Lab Mol Sci, State Key Lab Rare Earth Mat Chem & Applicat, Coll Chem & Mol Engn, Beijing 100871, Hebei, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Qiaoqi,Lin, Cong,Zhou, Zhengyang,et al. Systematic Study of Cr3+ Substitution into Octahedra-Based Microporous Aluminoborates[J]. INORGANIC CHEMISTRY,2014,53(11):5600-5608. |
| APA | Li, Qiaoqi.,Lin, Cong.,Zhou, Zhengyang.,Ju, Jing.,Li, Guobao.,...&Yang, Tao.(2014).Systematic Study of Cr3+ Substitution into Octahedra-Based Microporous Aluminoborates.INORGANIC CHEMISTRY,53(11),5600-5608. |
| MLA | Li, Qiaoqi,et al."Systematic Study of Cr3+ Substitution into Octahedra-Based Microporous Aluminoborates".INORGANIC CHEMISTRY 53.11(2014):5600-5608. |
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来源：化学研究所
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