Abstract
Catalytic liquid-phase oxidation using a catalyst and oxygen gas (Catalytic wet air oxidation, CWAO) is one of the most promising technology to remove hazardous organic compounds in wastewater. Up to now, various heterogeneous catalysts have been reported for phenolic compounds decomposition. The CeO2-ZrO2 based catalysts have been recently studied, because CeO2-ZrO2 works as a promoter which supplies active oxygen species from inside the lattice to the active sites. Since it is difficult to dissolve oxygen gas into water, the use of the promoter is effective for realizing the high catalytic activity at moderate conditions. Also, CeO2-ZrO2 shows high resistance for the metal leaching during the catalytic reaction in the liquid-phase. This article reviews the studies of the catalytic liquid-phase oxidation of phenolic compounds using CeO2-ZrO2 based catalysts.
Highlights
To date, industrial sector has been rapidly growing and contributing to an increase in hazardous waste
Ceria-zirconia (CeO2-ZrO2) based catalysts have been paid attention for the wastewater treatment due to their high oxygen release and storage abilities. In this mini-review, we provided the studies on the heterogeneous catalysts based on CeO2-ZrO2 solid solutions for catalytic liquid-phase oxidation of phenolic compounds
Choi et al (2017) demonstrated that the CeO2-ZrO2-Bi2O3 supported on SBA-16 catalyst exhibited the catalytic activity for bisphenolA oxidation, and 86% of bisphenol-A conversion was achieved for Ce0.67Zr0.18Bi0.15O2/SBA-16 even with the moderate reaction conditions of 80◦C for 3 h under atmospheric pressure
Summary
Industrial sector has been rapidly growing and contributing to an increase in hazardous waste. In this mini-review, we provided the studies on the heterogeneous catalysts based on CeO2-ZrO2 solid solutions for catalytic liquid-phase oxidation of phenolic compounds. As for the noble metal activator, Barbier et al (2005) investigated the Ru, Pd, or Pt supported on CeO2 catalysts, and confirmed that the order of phenol conversion was: Ru > Pd > Pt. For the Pd activator, the abrupt deactivation was observed due to the deposition of carbonaceous species.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
