PREPARATION AND CHARACTERIZATION OF NICKEL ALUMINUM MIXED OXIDES OBTAINED BY THERMAL-DECOMPOSITION OF HYDROTALCITE-TYPE PRECURSORS

被引：199

作者：

CLAUSE, O ^{[1
]}

REBOURS, B ^{[1
]}

MERLEN, E ^{[1
]}

TRIFIRO, F ^{[1
]}

VACCARI, A ^{[1
]}

机构：

[1] DIPARTIMENTO CHIM IND & MAT,I-40136 BOLOGNA,ITALY

来源：

JOURNAL OF CATALYSIS | 1992年 / 133卷 / 01期

关键词：

D O I：

10.1016/0021-9517(92)90200-2

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A series of nickel-aluminum mixed hydroxides was prepared by coprecipitation and their structure and composition was examined by X-ray diffraction and thermal analysis. The homogeneity of the Ni(II) and Al(III) cations in the brucite-type layers has been verified by EXAFS spectroscopy. The hydrotalcite-type precipitates were calcined and the composition of the resulting mixed oxides investigated. The selective dissolution of a Ni-doped alumina phase has been performed in concentrated NaOH solution. The alumina phase significantly contributes to the surface area of the mixed oxides but is suggested to play a minor role for the thermal stability of nickel oxide. A model for the nickel-aluminum mixed oxides obtained from hydrotalcite decomposition is proposed to involve the formation of nickel oxide and Ni-doped alumina phases in strong interaction with partially decomposed precursor layers or with a spinal-type phase at the NiO-Al2O3 interface. The latter phase is thought to be responsible for the thermal stabilization of the nickel oxide phase. © 1992.

引用

页码：231 / 246

页数：16

共 42 条

[1] STEAM REFORMING OF METHANE ON REDUCED NON-STOICHIOMETRIC NICKEL ALUMINATE CATALYSTS [J].