Synthesis and Modification of Ceria-based Materials

GIN-YA ADACHI and TOSHIYUKIMASUI Department of Applied Chemistry, Faculty of Engineering, Osaka University, Osaka, Japan e-mail adachi chem.eng.osaka-u.ac.jp 

Ceria has been recognized as a key material of the three-way catalysts in automobiles since it can release and uptake oxygen owing to the following reversible reaction  

This oxygen storage capacity (OSC) is useful to adjust the air/fuel ratio achieving a high conversion efficiency of the pollutants such as CO, NO, and hydrocarbons. In accordance with the recent enforce of restrictions, it is essential to eliminate the pollutants at low temperatures when an automobile engine has Just started.  

Synthesis and preparation process affects some properties of ceria-based materials such as formed phase, particle size, surface area, catalytic activities, and OSC etc. Therefore, many studies on synthesis, preparation, and modification have been carried out to develop the ceria-based materials of high catcilytic aetivities, OSC, and thermal durability. In this chapter, conventional processes and recent advances in the synthesis and modification of the ceria-based materials are reviewed with the dependence of these methods on the characteristics of the materials. 

---

A comprehensive review of conventional processes for the synthesis and modification of ceria-based materials was produced by Adachi and Masui. Here we will describe some of the approaches that have been recently employed to prepare ceria and ceria-based solids suited for the synthesis of gold catalysts for the WGS and PROX reactions. 

---