TNU-9, a new zeolite for the selective catalytic reduction of NO: An in situ X-ray absorption spectroscopy study

► Study of selective catalytic reduction of NO with C3H8 using Cu- and Co-TNU-9 as catalysts. ► Catalytic and spectroscopic in situ study. ► The presence of a mixed valence for both Cu-/Co-TNU-9 is necessary for the zeolite to have high catalytic performance.