Self-assembly of one-pot synthesized CexZr1−xO2–BaO·nAl2O3 nanocomposites promoted by site-selective doping of alumina with barium

Abstract

CeO₂-based redox nanomaterials are widely used in automotive catalysts, solid oxide fuel cell systems and many other applications as highly efficient redox systems. However, these properties suffer thermal deactivation under real operating conditions and accordingly thermal stability is a highly desirable property. We report that highly dispersed and intimately intermixed CeO₂–ZrO₂–BaO–Al₂O₃ nanocomposites can be synthesized by direct one-pot synthesis. With an appropriate choice of dopant concentration, a self-assembly mechanism is triggered on calcination at high temperatures to form a network of inter-grown stabilized transition aluminas and Ce_xZr_1−xO₂ nanocrystals anchored over barium hexaaluminate which show remarkable catalytic properties and an excellent stability against thermal and redox ageing.