Synthesis and Characterization of CexZr۱-xO۲ using Supercritical Water

Abstract

Research subject: Due to the public's attention on the environmental issues as well as strict environmental regulations, the eco-friendly methods for nanoparticles have received considerable attention in the recent years.
Research approach: In the present study, a mixed oxide nanoparticles containing cerium and zirconium (Ce_x-Zr_1-xO₂) was fabricated the in supercritical water (SCW) medium. The synthesized nanoparticles were characterized by various analyses, including X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and transmission electron microscopy (TEM).
Main results: The results of the analyses demonstrated that fine nanoparticles with mean size of 13±3 nm, with high crystallinity, and with appropriate size distribution and surface area were synthesized by SCW. Moreover, an oxygen storage capacity (OSC) as high as 1.25 mmol O₂/g was estimated for Ce_x-Zr_1-xO₂ nanoparticles through temperature programmed reduction in hydrogen (H₂-TPR). According to the obtained results, the Ce_x-Zr_1-xO₂ nanoparticles could be a suitable candidate for catalysts of oxidation processes as well as three-way catalyst for control of automotive exhaust gases.