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题名: UV Raman spectroscopic study on the phase transformation of ZrO2, Y2O3-ZrO2 and SO42-/ZrO2
作者: Li, C;  Li, MJ
刊名: JOURNAL OF RAMAN SPECTROSCOPY
发表日期: 2002-05-01
DOI: 10.1002/jrs.863
卷: 33, 期:5, 页:301-308
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology
类目[WOS]: Spectroscopy
研究领域[WOS]: Spectroscopy
英文摘要: The phase evolution of zirconia (ZrO2), sulfated zirconia (SO42-/ZrO2) and yttrium oxide incorporated zirconia (Y2O3-ZrO2) from the tetrahedral phase to the monoclinic phase was studied using UV Raman spectroscopy, visible Raman spectroscopy and x-ray diffraction (XRD). It is clearly observed that there are discrepancies between the results from the UV Raman spectra, visible Raman spectra and XRD patterns. The phase change from tetragonal to monoclinic is always earlier or at lower calcination temperatures as observed by UV Raman spectroscopy than by visible Raman spectroscopy and XRD. UV Raman spectroscopy is found to be more sensitive at the surface region while visible Raman spectroscopy and XRD supply the information mainly from the bulk. The inconsistency in the results from the three techniques suggests that the phase transformation of zirconia starts from its surface region and then gradually develops into its bulk. For SO42-/ZrO2 and Y2O3-ZrO2, the transformation from the tetragonal to the monoclinic phase is significantly retarded owing to the presence of the sulfated groups and the yttrium oxide. Particularly, the tetragonal phase of Y2O3-ZrO2 can be maintained up to 800degreesC although its phase at the surface region changed into monoclinic at 500degreesC. Copyright (C) 2002 John Wiley Sons, Ltd.
关键词[WOS]: SUPPORTED MOLYBDENA CATALYSTS ;  COKE FORMATION ;  GAMMA-ALUMINA ;  ZIRCONIA ;  ZEOLITES ;  SPECTRA ;  DIFFRACTION ;  CHEMISTRY ;  STABILITY ;  SULFATE
语种: 英语
WOS记录号: WOS:000175735900002
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139113
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Li, C,Li, MJ. UV Raman spectroscopic study on the phase transformation of ZrO2, Y2O3-ZrO2 and SO42-/ZrO2[J]. JOURNAL OF RAMAN SPECTROSCOPY,2002,33(5):301-308.
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