Efficient synthesis of flexible SCR catalysts utilizing graphene oxide as a bridging agent without calcination: Catalytic performance, mechanism and kinetics studies

The mechanical performance of flexible catalysts remains a significant challenge for industrial applications. In this study, graphene oxide (GO) functions as both a binder and a redox mediator, serving as a crucial “bridge” between metal species and the organic foam, thereby substantially enhancing NO_x conversion efficiency. Catalytic activity tests demonstrate that the GO-modified [email protected] catalyst achieves a NO_x conversion rate exceeding 95%. The incorporation of GO strengthens the adhesion between the organic foam and metal components, increases the surface roughness of the sponge, and ensures the uniform and stable distribution of metal active sites. Additionally, GO enhances the content of effective catalytic species, improves electron transfer efficiency in the selective catalytic reduction reaction, and reduces diffusion resistance. To elucidate the NO reduction mechanism, in situ diffuse reflectance infrared Fourier transform spectroscopy and transient reaction studies were performed. The results indicate that as the reaction temperature increases, both the Eley-Rideal and Langmuir-Hinshelwood mechanisms contribute to promoting the SCR reaction rate.