In situ synthesis of CuSAPO-34/cordierite and its selective catalytic reduction of nitrogen oxides in vehicle exhaust: The effect of HF

► HF added in the preparation CuSAPO-34/cordierite improves the crystallinity of CuSAPO-34. ► Catalyst prepared with HF has higher CuSAPO-34 loading amount, pore volume and BET surface area. ► Catalyst prepared with HF shows higher NOx SCR activity in the simulated diesel vehicle exhaust. ► Catalyst prepared with HF presents wider active temperature window of NOx conversion rate > 95%.