Preparation of Larnthanum β‐Alumina with High Surface Area by Coprecipitation

Abstract

Mixtures of La 2 O 3 and Al 2 O 3 with various La contents were prepared by co‐precipitation from La(NO 3 ) 3 and Al(NO 3 ) 3 solutions and calcined at 800° to 1400°C. The addition of small amounts of La 2 O 3 (2 to 10 mol%) to Al 2 O 3 gives rise to the formation of lanthanum β‐alumina (La 2 O 3 ·11–14Al 2 O 3 ) upon heating to above 1000°C and retards the transformation of γ‐Al 2 O 3 to α‐Al 2 O 3 and associated sintering.