Influence of the preparation process on the performance of three hydrotalcite-based De-SO_x catalysts

In this study, three hydrotalcite-based De-SO_x catalysts were prepared using different approaches: impregnation, coprecipitation, and precipitation using the separate nucleation and aging steps (SNAS) method. The physicochemical properties of these catalysts were studied and their SO_x removal behaviors were characterized with a custom-built apparatus simulating the conditions in a fluid catalytic cracking (FCC) regenerator. The results showed that the catalyst prepared using the SNAS method had the highest SO_x adsorption rate, the largest SO_x pick-up capacity (1.31 g/g cat.) and the lowest onset reduction temperature (805 K), which makes it an excellent De-SO_x catalyst with promising applications in industry.