Effects of Preparation on the Properties of Niobia-Alumina Binary Oxides
Final rept. 26 Aug 1986-1 Jun 1988
ARMY MILITARY PERSONNEL CENTER ALEXANDRIA VA PROGRAM ANALYSIS OFFICE
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NiobiaAlumina Nb2O5Al2O3 mixed oxides and SiO2- supported Nb2O5 Al2O3 binary oxides were prepared over a wide composition range. The mixed oxides were prepared by coprecipitation and the supported oxides were synthesized by incipient wetness impregnation. All of the binary oxides were calcined 500 C in oxygen and had a further high temperature 1000 C ramp in flowing helium, to determine if the materials were stable. All oxides were found to be amorphous after calcination, while the mixed oxides formed crystallites after the high temperature ramp. By using Hammett indicators and titrating with n-butyl-amine, the binary oxides all showed high acid strength and acidity. The catalytic activities of these materials were investigated by the 1-butene isomerization reaction. Keywords Niobia-Alumina binary oxides, Mixed oxide, Surface-Phase oxide, Supported oxide, Supported binary oxide.
- Inorganic Chemistry