The superior performance of hydrothermal method made CeZrTi catalyst for selective catalytic reduction of NO with NH3

Abstract

A highly efficient catalyst of a CeZrTi mixed oxide prepared by the Hydrothermal method (CeZrTi-HT) was developed for the selective catalytic reduction (SCR) of NOx with ammonia, which was directly compared with other three CeZrTi samples as synthesized via Co-Precipitation method (CeZrTi-CP) Citric Acid method (CeZrTi-CA) and Impregnation method (CeZrTi-IP). We can found that the CeZrTi-HT catalyst has good catalytic activity in a wide temperature range. The results showed that the catalyst prepared by hydrothermal method has uniform particle composition and high specific surface area, providing a larger reactive surface for the catalytic reaction. In addition, the CeZrTi-HT catalyst had abundant oxygen vacancies and defects, which improved the number of surface active oxygen and greatly promoted the catalytic reaction. Furthermore, the formation of Ce3+ was highly important, and the much more Ce3+ contributed to increase redox properties and more surface acid sites than the other catalysts.