The effect of dispersant characteristics on the De-NOx efficiency of SCR catalyst

In this study, we analyzed the effect of dispersant characteristics on the selective catalytic reduction (SCR) catalyst properties and de-NOx efficiency. For this, we measured the zeta potential and pH value of each dispersant, and compared the thermal properties of the dispersant through TG-DTA analysis. Also, the Py-GC/MS analysis results and the MSDS contents of the product were used to compare the components and molecular weight types of the dispersant. As a result, the higher the zeta potential, pH, and molecular weight of the dispersant, the more improved the dispersibility of the TiO2 slurry. Characteristics such as the rheology, sedimentation, and pH change, were studied to compare the dispersibility of the catalyst slurries, and the dispersion characteristics of the TiO2 slurries were confirmed by TEM. The SCR catalysts prepared varied based on the dispersant added, with the varying factor being the de-NOx efficiency between (250 to 450) degrees C depending on the dispersibility. The dispersant with the excellent dispersibility gave the highest efficiency of 84% or more at 250 degrees C and 300 degrees C, and the highest de-NOx efficiency of more than 92% at 350 degrees C and 400 degrees C.

Automated summary

This study analyzed the impact of dispersant characteristics on the properties and de-NOx efficiency of SCR catalysts. Measurements of zeta potential, pH, and molecular weight were conducted, and thermal properties were compared through TG-DTA analysis. Py-GC/MS analysis and MSDS contents were used to compare components and molecular weight types of the dispersant. The results showed that dispersants with higher zeta potential, pH, and molecular weight improved the dispersibility of TiO2 slurry. Characteristics such as rheology, sedimentation, and pH change were studied to compare the dispersibility of catalyst slurries, and dispersion characteristics of TiO2 slurries were confirmed by TEM. The de-NOx efficiency of the SCR catalysts varied based on the dispersant used, with higher dispersibility resulting in higher efficiency.