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题名: Temperature dependence of the pseudomorphic transformation of MoO3 to gamma-Mo2N
作者: Zhang, YJ;  Xin, Q;  Rodriguez-Ramos, I;  Guerrero-Ruiz, A
关键词: nitrides ;  crystal growth ;  X-ray diffraction ;  X-ray photoelectron spectroscopy ;  surface properties
刊名: MATERIALS RESEARCH BULLETIN
发表日期: 1999
卷: 34, 期:1, 页:145-156
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology
类目[WOS]: Materials Science, Multidisciplinary
研究领域[WOS]: Materials Science
英文摘要: The transformation of MoO3 into gamma-Mo2N during its nitridation by temperature-programmed reaction with NH3/has been investigated. The X-ray diffraction (XRD) results indicate that the conversion of the MoO3 bulk structure was significant at 673 K, although a notable increase in the surface area was observed at higher temperatures such as 773 K. For the sample synthesized at 973 K for 2 h, the achieved surface area was 140 m(2).g(-1) with approximately 60% pore volume within the diameter range of 20-30 Angstrom. The XRD and differential thermal analysis (DTA) results indicate that some intermediates, i.e., H0.3MoO3, MoO2, and gamma-Mo2OxN1-x, were formed during the pseudomorphic transformation of MoO3 to gamma-Mo2N in the temperature range of 673-973 K. Some new information about the transformation reaction was provided by X-ray photoelectron spectroscopy (XPS) and Fourier transformed infrared (FT-IR) spectroscopy. XPS results revealed that Mo2+ species was the main species exposed at the surface of passivated samples. (C) 1999 Elsevier Science Ltd.
关键词[WOS]: TRANSITION-METAL CARBIDES ;  NITRIDE HYDRODENITROGENATION CATALYSTS ;  MOLYBDENUM NITRIDE ;  SURFACE-AREA ;  HYDRODESULFURIZATION ;  TUNGSTEN ;  MO2N ;  HYDROGENATION ;  QUINOLINE ;  BEHAVIOR
语种: 英语
WOS记录号: WOS:000079769300017
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138536
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.Univ Nacl Educ Distancia, Fac Ciencias, Dept Quim Inorgan, Madrid 28040, Spain
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
3.CSIC, Inst Catalisis & Petr Quim, Madrid 28049, Spain

Recommended Citation:
Zhang, YJ,Xin, Q,Rodriguez-Ramos, I,et al. Temperature dependence of the pseudomorphic transformation of MoO3 to gamma-Mo2N[J]. MATERIALS RESEARCH BULLETIN,1999,34(1):145-156.
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