The Antichlorine Poisoning Mechanism in Phosphorylated Co ₂ Fe _0.67 Cr _0.33 Catalyst During Chlorobenzene Combustion

The catalytic combustion of chlorine-containing volatile organic compounds (Cl-VOCs) often leads to catalyst deactivation due to chlorine accumulation, posing major challenges for industrial applications. In this study, the transition metal catalyst Co₂Fe_0.67Cr_0.33 was phosphorylated to improve its surface acidity and hydrolysis activation performance. The catalysts were characterized using X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and in situ Diffuse Reflaxions Infrared Fourier Transformations Spectroscopy (DRIFTS). Results showed that phosphate ions, introduced via a simple impregnation method, adhered uniformly to the catalyst surface without altering its morphology or redox properties. The phosphorylated catalyst exhibited enhanced hydrolysis activation performance, achieving a T₉₀ of 272°C for 500 ppm chlorobenzene under 5 vol% water conditions. Moreover, the catalyst was resistant to water-induced competitive adsorption. The HCl selectivity under 5 vol% water was 5.15 times higher than under normal conditions, significantly improving the catalyst's antipoisoning ability and extending its stability. This study provides a theoretical basis for designing antipoisoning strategies in Cl-VOCs catalytic combustion and offers insights for industrial applications.