Effect of Zr4+-ion substitution in CeO2 on H2O2-assisted degradation of orange G

A series of Pd ion-substituted CeO2–ZrO2 solid solutions were synthesized using the solution combustion technique. H2O2-assisted degradation of orange G was carried out in the presence of the catalysts. The activity of the catalysts was found to increase with the introduction of the second component in the solid solution, as signified by an increase in the rate constants and lowering of activation energy. The study showed the involvement of lattice oxygen and the importance of reducibility of the compound for the reaction.

Graphical AbstractH2O2-assisted degradation of orange G was found to increase with bulk substitution of ions in the support. Pd-substituted CeO2 showed higher activity for degradation on Zr4+ substitution and ZrO2 showed higher activity on Ce4+ substitution. This showed the effect of reducibility of the support on the kinetics of the reaction.Figure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights► A series of Pd-ion substituted CeO2–ZrO2 solid solutions were synthesized. ► The crystal structure was determined by FT-Raman spectroscopy. ► H2O2-assisted degradation of OG was carried out. ► The role of reducibility of the catalyst for the reaction was established.