Accession Number : ADA180314

Title :   Preparation and Properties of Cubic ZrO2 Stabilized with Ni(II).

Descriptive Note : Technical rept.,

Corporate Author : BROWN UNIV PROVIDENCE RI DEPT OF CHEMISTRY

Personal Author(s) : Smith,K E ; Kershaw,R ; Dwight,K ; Wold,A

PDF Url : ADA180314

Report Date : 15 May 1987

Pagination or Media Count : 10

Abstract : The Fischer-Tropsch activity of the nickel-zirconia system has been investigated and preparations of the catalyst involving coprecipitation gave a significantly more active catalyst than did preparations involving impregnation. Stabilization towards reduction has been observed when certain transition metal ions such as Rh(III) are inserted into the fluorite ZrO2 structure. Recent investigations using the NiO/ZrO2 system have concluded that NiO does not interact with zirconium oxide, but the materials were prepared by incipient wetness. It was the purpose of this study to investigate the formation of cubic ZrO2 stabilized with Ni(II) and to relate the structural properties of the catalyst with its observed stability in reducing atmospheres. These properties were then compared to those of catalysts prepared by incipient wetness. Changes in the structure of ZrO and in the temperatures at which reduction of Ni(II) to Ni metal occurred were then related to the relative strengths of the catalyst-support interaction.

Descriptors :   *CATALYSTS, *ZIRCONIUM OXIDES, *MOLECULAR STRUCTURE, CATALYSTS, IMPREGNATION, STRUCTURAL PROPERTIES, CHEMICAL PRECIPITATION, STRENGTH(GENERAL), IONS, TRANSITION METALS, NICKEL, OXIDES, NITRATES, NICKEL COMPOUNDS, ZIRCONIUM COMPOUNDS, STABILIZATION, X RAY DIFFRACTION, THERMOGRAVIMETRIC ANALYSIS, PYROLYSIS

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE