ESCA, XRD, AND IR CHARACTERIZATION OF ALUMINUM-OXIDE, HYDROXYFLUORIDE, AND FLUORIDE SURFACES IN CORRELATION WITH THEIR CATALYTIC ACTIVITY IN HETEROGENEOUS HALOGEN EXCHANGE-REACTIONS
ESCA, XRD, AND IR CHARACTERIZATION OF ALUMINUM-OXIDE, HYDROXYFLUORIDE, AND FLUORIDE SURFACES IN CORRELATION WITH THEIR CATALYTIC ACTIVITY IN HETEROGENEOUS HALOGEN EXCHANGE-REACTIONS
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DOI：
10.1006/jcat.1994.1208
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发表时间：
1994-07-01
影响因子：
7.3
通讯作者：
MENZ, DH
中科院分区：
文献类型：
--
作者：
HESS, A;KEMNITZ, E;MENZ, DH
研究了某些氧化铝、羟基氟化物和氟化物对CHCl3-NFN卤代烷系列歧化反应的催化活性。在大多数情况下，必须对催化剂表面进行修饰，以使其具有催化活性。在活化过程中使用了卤代烷流动。用X射线衍射仪和红外光谱仪对样品的固相变化进行了分析。用ESCA对卤代烷处理前后的固体表面进行了表征。作为我们测量的结果，我们可以说，在固体样品活化过程中形成的催化活性相在化学计量比和结构上类似于β-AlF3结构。使用单独合成的预干燥β-AlF3，可以观察到该样品立即具有催化活性。讨论了使用不同的固体起始物质可以形成的催化活性物种的性质。在ESCA结果和一些固体样品的催化行为之间建立关联是可能的。(C)1994年学术出版社。
The catalytic activity of certain aluminum oxides, hydroxyfluorides, and fluorides applied to dismutation reactions of the CHCl3-nFn haloalkane series has been studied. In most cases the catalyst surface has to be modified so that it is catalytically active. A haloalkane flow has been used for the activation procedure. The alteration of the solid phases is followed by XRD and IR. ESCA is applied for the characterization of the solid surfaces before and after treatment with the haloalkanes. As a result of our measurements, we can state that the catalytically active phase which is formed during the activation of the solid samples is stoichiometrically and structurally similar to the beta-AlF3 structure. Using separately synthesized predried beta-AlF3, it could be observed that this sample immediately possess catalytic activity. The nature of the catalytically active species which can be formed using different solid starting substances is discussed. It is possible to draw a correlation between the ESCA results and the catalytic behaviour of a number of solid samples. (C) 1994 Academic Press, Inc.