Metal-organic frameworks templated micropore-enriched defective MnCeOx for low temperature chlorobenzene oxidation

In this study, a series of metal-organic frameworks (MOFs) derived binary porous MnCeOx catalysts were synthesized via solvothermal method for chlorobenzene (CB) oxidation. Compared with the catalysts from co-precipitation and sol-gel method, Mn1Ce1-MOF catalyst presented the best performance with T90% at 242 °C and highest COx yield of 94.6% at 400 °C, owing to its micropore-enriched structure, higher lattice oxygen ratio and better surface reducibility. The HCl selectivity of Mn1Ce1-MOF reached 91.3% at 400 °C. The gaseous byproducts over Mn1Ce1-MOF catalyst were identified and the degradation pathway of CB was proposed. The catalytic activity of Mn1Ce1-MOF catalyst at 300 °C could stabilize over 75% for 40 h. The oxidation of Mn3+ and chlorine species adsorption were considered to be the main reasons for the catalyst inactivation. This work provides a highly-efficient MOFs templated porous metal oxide for tail gas purification.