Studies on thermal dehydration of hydrated chromic oxide
文献类型：期刊论文
| 作者 | Yao, ZM; Li, ZH; Zhang, Y |
| 刊名 | JOURNAL OF COLLOID AND INTERFACE SCIENCE
 |
| 出版日期 | 2003-10-15 |
| 卷号 | 266期号:2页码:382-387 |
| 关键词 | thermal dehydration hydrated chromic oxide crystallization amorphous Cr2O3 microcrystalline |
| ISSN号 | 0021-9797 |
| 其他题名 | J. Colloid Interface Sci. |
| 中文摘要 | Hydrated chromic oxide was prepared by the reduction of potassium dichromate in an autoclave using sucrose. The thermal dehydration of the parent gel in different atmospheres was studied comparatively using the techniques of thermal gravimetry, differential thermal analysis, X-ray diffraction analysis, FT-IR spectroscopy, and gas adsorption. The results of thermogravimetric and differential thermal analysis show that the temperature at which the glow phenomenon occurs is dependent on the gaseous atmosphere in the heat-treatment process and increases in the following order: air, nitrogen, and carbon dioxide. When heated in CO2, the parent gel is transformed into crystalline alpha-Cr2O3 going through the phase of amorphous Cr2O3. In air, however, it is decomposed directly into crystalline alpha-Cr2O3 without going through the amorphous Cr2O3 phase. It is also found that microcrystallites of alpha-Cr2O3 have been formed before the glow phenomenon occurs at 390 degreesC in air and at 590 degreesC in CO2, respectively. The mechanism for thermal dehydration in air and CO2 is discussed. (C) 2003 Elsevier Inc. All rights reserved. |
| 英文摘要 | Hydrated chromic oxide was prepared by the reduction of potassium dichromate in an autoclave using sucrose. The thermal dehydration of the parent gel in different atmospheres was studied comparatively using the techniques of thermal gravimetry, differential thermal analysis, X-ray diffraction analysis, FT-IR spectroscopy, and gas adsorption. The results of thermogravimetric and differential thermal analysis show that the temperature at which the glow phenomenon occurs is dependent on the gaseous atmosphere in the heat-treatment process and increases in the following order: air, nitrogen, and carbon dioxide. When heated in CO2, the parent gel is transformed into crystalline alpha-Cr2O3 going through the phase of amorphous Cr2O3. In air, however, it is decomposed directly into crystalline alpha-Cr2O3 without going through the amorphous Cr2O3 phase. It is also found that microcrystallites of alpha-Cr2O3 have been formed before the glow phenomenon occurs at 390 degreesC in air and at 590 degreesC in CO2, respectively. The mechanism for thermal dehydration in air and CO2 is discussed. (C) 2003 Elsevier Inc. All rights reserved. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Chemistry, Physical |
| 研究领域[WOS] | Chemistry |
| 关键词[WOS] | SELECTIVE CATALYTIC REDUCTION ; NITRIC-OXIDE ; SURFACE PROPERTIES ; AMORPHOUS CHROMIA ; ALPHA-CHROMIA ; CRYSTALLINE CHROMIA ; OXYGEN ; ADSORPTION ; WATER ; GEL |
| 收录类别 | SCI |
| 原文出处 | |
| 语种 | 英语 |
| WOS记录号 | WOS:000185782400019 |
| 公开日期 | 2013-11-08 |
| 版本 | 出版稿 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/5357]  |
| 专题 | 过程工程研究所_研究所（批量导入） |
| 作者单位 | Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yao, ZM,Li, ZH,Zhang, Y. Studies on thermal dehydration of hydrated chromic oxide[J]. JOURNAL OF COLLOID AND INTERFACE SCIENCE,2003,266(2):382-387. |
| APA | Yao, ZM,Li, ZH,&Zhang, Y.(2003).Studies on thermal dehydration of hydrated chromic oxide.JOURNAL OF COLLOID AND INTERFACE SCIENCE,266(2),382-387. |
| MLA | Yao, ZM,et al."Studies on thermal dehydration of hydrated chromic oxide".JOURNAL OF COLLOID AND INTERFACE SCIENCE 266.2(2003):382-387. |
入库方式： OAI收割
来源：过程工程研究所
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