Abstract
Ceria-zirconia mixed oxides have been synthesized by hydrothermal synthesis process. Under hydrothermalconditions, water potential to control the direction of crystal growth, morphology, particle size and sizedistribution, because of the controllability of thermodynamics and transport properties by pressure andtemperature. The synthesis was carried out at temperatures of 150 − 200 oC and pressure of 5 MPa in a batchreactor. The reactor made of SUS 304 tube reactor with internal volume of 8.8 ml. The synthesized productswere calcined and characterized using SEM, XRD and FTIR. The results showed that the particles formed weresphere shaped particles with smooth morphology and the size of particle diameters were 35, 61, and 31 nm onaverage for reactions temperatures of 150, 180, and 200oC, respectively. The XRD pattern indicated thatceria-zirconia mixed powder was uniformly distributed in the structure to form a homogeneous solid solution.
Highlights
In recent years, with the increasing awareness of both environmental safety and the need for optimal energy utilization, there is a case for the development of nonhazardous materials
Due to the scanning electron microscope (SEM) image resolution, the morphology of particles formed at 180oC seemed less clear
The particle diameters of calcined powder were determined by using particle size analyzer (PSA)
Summary
With the increasing awareness of both environmental safety and the need for optimal energy utilization, there is a case for the development of nonhazardous materials. These materials should be compatible with human life and with other living forms or species. Processing techniques such as fabrication, treatment, reuse, and recycling of waste materials should be environmentally friendly. In this respect, the hydrothermal method occupies a unique place in modern science and technology. The solvation properties of supercritical solvents are being extensively used for detoxifying organic and pharmaceutical wastes and to replace toxic solvents commonly used for chemical synthesis (Bryappa & Yoshimura, 2001)
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