In 1997, Yokota et al. [16] investigated the catalytic performance of Pt-group metals for H2-SCR and reported that Pt shows
the highest NO reduction activity among platinum group metals
when supported on Al2O3. For Pt, the effectiveness of catalyst support was in the order of ZSM-5 ∼ mordenite > SiO2> Al2O3. It was
noted that NO reduction over Pt/mordenite took place between 100
and 200
◦
C and that NO conversion increased with increasing H2
concentration and NO concentration, although coexisting CO inhibited NO reduction. They also found the high catalytic performance
of Pt–Mo–Na/SiO2 catalyst for H2-SCR with a wide temperature
window.