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 Co2Fe0.67Cr0.33 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.
Yu et al. (Thu,) studied this question.