Significant promoting effect of Ce or La on the hydrothermal stability of Cu-SAPO-34 catalyst for NH3-SCR reaction

The hydrothermal stability of Cu-SAPO-34 was significantly enhanced by the addition of Ce or La. The introduction of Ce or La effectively mitigated the dealumination and restrained the aggregation of copper species. The hydrothermal treatment cut off the “E-R” reaction route over the Cu-SAPO-34 and opened the new reaction pathway (“L-H” mechanism) over the Cu/La-SAPO-34.