Rapid Synthesis of Cu-SSZ-39 and Study of Phosphorus Poisoning in NH3-SCR

•The rapid synthesis of SSZ-39 was realized by introducing H2O2 as an accelerator, and the synthesis time was shortened to 3 d.•Phosphorus poisoning caused a decrease in the low-temperature activity but did not change “L-H” the reaction pathway of Cu-SSZ-39.•The hydrothermal treatment can promote the decomposition of Cu-P species and the generation of Cu2+ active species to alleviate the phosphorus poisoning effect.•The introduction of mesopores enhanced the fresh activity of Cu-SSZ-39 after phosphorus poisoning.