Catalytic performance of CexZr1-xO2 solid solutions promoted via modification on synthesis methods

CexZr1-xO2 solid solutions were synthesized via various methods which were modified based on conventional precipitation and sol-gel methods. X-ray diffraction (XRD) analysis revealed that CexZr1-xO2 solid solutions obtained via these methods exhibited cubic structure. Specific surface area and oxygen storage capacity (OSC) characterizations displayed that CexZr1-xO2 solid solutions prepared via these modified methods exhibited higher specific surface area, thermal stability, and OSC than synthesized via those common approaches. Encapsulation with Al2O3 and SiO2 via a dipping method also increases the specific surface area of CexZr1-xO2 solid solutions. Catalytic activity of these solid solutions was assessed using a 4-channel catalysis device. The results revealed that CexZr1-xO2 solid solutions synthesized via those modified methods exhibited higher catalytic activity than the common method. The solid solution prepared via NH3 center dot H2O precipitation with the addition of dodecanoic acid method exhibited the lowest light-off temperature and highest catalytic activity. (C) 2010 Elsevier B.V. All rights reserved.