Effect of coating modification of cordierite carrier on catalytic performance of supported NiMnO3 catalysts for VOCs combustion

NiMnO3 perovskite catalysts supported on cordierite modified by CexZr1-xO2 coatings were prepared using impregnation and sol-gel methods for catalytic combustion of single/double component VOCs at different concentrations and GHSV of 15,000 h(-1), which were characterized by BET, XRD, SEM, FT-IR, H-2-TPR and O-2-TPD. After coating modification, the specific surface area of catalysts is improved obviously. Among the catalysts, the Ce0.75Zr0.25O2 coating modified NiMnO3 catalyst exhibits the best catalytic activity for VOCs combustion with 95.6% conversion at 275 degrees C and has stable activity when catalyst is embalmed at 800 degrees C. In addition, the catalyst also presents the excellent water-resistant and conversion stability over time-on-stream condition. The reason is that Ce0.75Zr0.25O2 coating can promote more lattice distortion and defects and smaller crystal size, which improve oxygen transfer capability and dispersion of active component. (C) 2018 Published by Elsevier B.V. on behalf of Chinese Society of Rare Earths.