Improving the hydrothermal stability of Al-rich Cu-SSZ-13 zeolite via Pr-ion modification.

ABSTRACT: Al-rich (Si/Al = 4-6) Cu-SSZ-13 has been recognized as one of the potential catalysts to replace the commercial Cu-SSZ-13 (Si/Al = 10-12) towards ammonia-assisted selective catalytic reduction (NH₃-SCR). However, poor hydrothermal stability is a great obstacle for Al-rich zeolites to meet the catalytic applications containing water vapor. Herein, we demonstrate that the hydrothermal stability of Al-rich Cu-SSZ-13 can be dramatically enhanced via Pr-ion modification. Particularly, after high-temperature hydrothermal aging (HTA), CuPr_1.2-SSZ-13-HTA with an optimal Pr content of 1.2 wt% exhibits a T₈₀ (temperature window of NO conversion above 80%) window of 225-550 °C and a T₉₀ window of 250-350 °C. These values are superior to those of Cu-S

SUBMITTER: Chen M 

PROVIDER: S-EPMC11023032 | biostudies-literature | 2024 Apr

REPOSITORIES: biostudies-literature