Ce regulated surface properties of Mn/SAPO-34 for improved NH₃-SCR at low temperature.

ABSTRACT: Ce modified MnO _x /SAPO-34 was prepared and investigated for low-temperature selective catalytic reduction of NO _x with ammonia (NH₃-SCR). The 0.3Ce-Mn/SAPO-34 catalyst had nearly 95% NO conversion at 200-350 °C at a space velocity of 10 000 h^-1. Microporous SAPO-34 as the support provided the catalyst with increased hydrothermal stability. XPS and H₂-TPR results proved that the Mn⁴⁺ and O_α content increased after incorporation of Ce, this promoted the conversion of NO at low temperature via a 'fast SCR' route. NH₃-TPD measurements combined oxidation experiments of NO, NH₃ indicated the reduction of both the surface acidity and the amount of acid sites, which effectively

SUBMITTER: Chen Q 

PROVIDER: S-EPMC9057469 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature