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

作者：Dong Qiang; Yin Shu; Guo Chongshen; Sato Tsugio

来源：Nanoscale Research Letters, 2012, 7(1): 542.

DOI：10.1186/1556-276X-7-542

• Solvothermal
• Aluminum
• Solid solutions
• Catalysis
• Oxygen storage capacity
• Thermal stability

A facile solvothermal method to synthesize aluminum-doped ceria-zirconia (Ce0.5Zr0.5-x Al (x) O2-x/2, x = 0.1 to 0.4) solid solutions was carried out using Ce(NH4)(2)(NO3)(6), Zr(NO3)(3)center dot 2H(2)O Al(NO3)(3)center dot 9H(2)O, and NH4OH as the starting materials at 200A degrees C for 24 h. The obtained solid solutions from the solvothermal reaction were calcined at 1,000A degrees C for 20 h in air atmosphere to evaluate the thermal stability. The synthesized Ce0.5Zr0.3Al0.2O1.9 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 600A degrees C using thermogravimetric-differential thermal analysis. Ce0.5Zr0.3Al0.2O1.9 solid solutions calcined at 1,000A degrees C for 20 h with a BET surface area of 18 m(2) g(-1) exhibited a considerably high OSC of 427 mu mol-O g(-1) and good OSC performance stability. The same synthesis route was employed for the preparation of the CeO2 and Ce0.5Zr0.5O2. The incorporation of aluminum ion in the lattice of ceria-based catalyst greatly enhanced the thermal stability and OSC.

• 出版日期2012-10-1