| Facile synthesis of nano-crystalline alpha-alumina at low temperature via an absolute ethanol sol-gel strategy | |
| Department | OSSO国家重点实验室 |
Xu LL(徐磊磊)1,2 ; Song HL(宋焕玲)1; Chou LJ(丑凌军)1; Chou LJ(丑凌军)
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| 2012 | |
| Source Publication | Materials Chemistry and Physics
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| ISSN | 0254-0584 |
| Volume | 132Issue:2-3Pages:1071-1076 |
| Abstract | Facile synthesis of nano-crystalline α-Al2O3 at low temperature was systematically investigated. An easily accessible and reproducible sol–gel strategy utilizing aluminum isopropoxide, absolute ethanol and nitric acid (or hydrochloric acid) as raw materials was designed. The thermal decomposition of the precursor (gel) and subsequent formation of α-Al2O3 were characterized by X-ray diffraction (XRD), nitrogen adsorption and desorption measurements, thermogravimetric-differential scanning calorimetry (TG-DSC) and Fourier transform infrared spectra (FTIR). During the process of subsequent low temperature heat treatment of precursor gel, the formation of α-Al2O3 was firstly observed at temperature as low as 400 °C without the appearance of other transition phases. However, the additional γ-Al2O3 diffraction peaks appeared at 800 °C unexpectedly and then gradually disappeared in the further calcination stage up to 1000 °C. These phenomena could not be illustrated by the traditional alumina phase transformation theories. Herein, a hypothetical scheme was put forward to explain these unique phenomena met with in our investigation. Besides, the critical role of the acid modifier in lowering the phase transformation temperature of α-Al2O3 was also carefully studied. The results indicated that the increasing molar ratio of acid to aluminum isopropoxide and using nitric acid as modifier were in favor of the phase transformation from γ- to α-Al2O3. |
| Keyword | Oxides Sol-gel Growth Powder Diffraction Fourier Transform Infrared Spectroscopy |
| Subject Area | 物理化学与绿色催化 |
| DOI | 10.1016/j.matchemphys.2011.12.069 |
| Funding Organization | the State Key Laboratory for Oxo Synthesis and Selective Oxidation of China |
| Indexed By | SCI |
| If | 2.072 |
| Language | 英语 |
| Funding Project | 多相催化研究组 |
| compositor | 第一作者单位 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.licp.cn/handle/362003/3894 |
| Collection | 羰基合成与选择氧化国家重点实验室（OSSO） |
| Corresponding Author | Chou LJ(丑凌军) |
| Affiliation | 1.Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Oxo Synth & Select Oxidat, Lanzhou 730000, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China |
| Recommended Citation GB/T 7714 | Xu LL,Song HL,Chou LJ,et al. Facile synthesis of nano-crystalline alpha-alumina at low temperature via an absolute ethanol sol-gel strategy[J]. Materials Chemistry and Physics,2012,132(2-3):1071-1076. |
| APA | Xu LL,Song HL,Chou LJ,&丑凌军.(2012).Facile synthesis of nano-crystalline alpha-alumina at low temperature via an absolute ethanol sol-gel strategy.Materials Chemistry and Physics,132(2-3),1071-1076. |
| MLA | Xu LL,et al."Facile synthesis of nano-crystalline alpha-alumina at low temperature via an absolute ethanol sol-gel strategy".Materials Chemistry and Physics 132.2-3(2012):1071-1076. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| B51.Materials Chemis（804KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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