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A facile solvothermal method to synthesize aluminum-doped ceria-zirconia (Ce 0.5 Zr 0.5- x  Al  x  O 2- x /2 ,  x  = 0.1 to 0.4) solid solutions was carried out using Ce(NH 4 ) 2 (NO 3 ) 6 , Zr(NO 3 ) 3 ·2H 2 O Al(NO 3 ) 3 ·9H 2 O, and NH 4 OH as the starting materials at 200°C for 24 h. The obtained solid solutions from the solvothermal reaction were calcined at 1,000°C for 20 h in air atmosphere to evaluate the thermal stability. The synthesized Ce 0.5 Zr 0.3 Al 0.2 O 1.9  particle was characterized for the oxygen storage capacity (OSC) in automotive catalysis. For the characterization, X-ray diffraction, transmission electron microscopy, and the Brunauer-Emmet-Teller (BET) technique were employed. The OSC values of all samples were measured at 600°C using thermogravimetric-differential thermal analysis. Ce 0.5 Zr 0.3 Al 0.2 O 1.9  solid solutions calcined at 1,000°C for 20 h with a BET surface area of 18 m 2  g −1  exhibited a considerably high OSC of 427 μmol-O g −1  and good OSC performance stability. The same synthesis route was employed for the preparation of the CeO 2  and Ce 0.5 Zr 0.5 O 2 . The incorporation of aluminum ion in the lattice of ceria-based catalyst greatly enhanced the thermal stability and OSC.

Aluminum-doped ceria-zirconia solid solutions with enhanced thermal stability and high oxygen storage capacity