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Studies on thermal dehydration of hydrated chromic oxide
Alternative TitleJ. Colloid Interface Sci.
Yao, ZM; Li, ZH; Zhang, Y
2003-10-15
Source PublicationJOURNAL OF COLLOID AND INTERFACE SCIENCE
ISSN0021-9797
Volume266Issue:2Pages:382-387
AbstractHydrated 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.; 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.
KeywordThermal Dehydration Hydrated Chromic Oxide Crystallization Amorphous Cr2o3 Microcrystalline
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/S0021-9797(03)00734-3
URL查看原文
Indexed BySCI
Language英语
WOS KeywordSELECTIVE CATALYTIC REDUCTION ; NITRIC-OXIDE ; SURFACE PROPERTIES ; AMORPHOUS CHROMIA ; ALPHA-CHROMIA ; CRYSTALLINE CHROMIA ; OXYGEN ; ADSORPTION ; WATER ; GEL
WOS Research AreaChemistry
WOS SubjectChemistry, Physical
WOS IDWOS:000185782400019
Citation statistics
Cited Times:29[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/5357
Collection研究所(批量导入)
AffiliationChinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100080, Peoples R China
Recommended Citation
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.
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