H2-SCR did not attract much attention before because of the
superior efficiency of NH3 and hydrocarbon reductant for SCR
of NO in oxygen-rich atmospheres. However, after it was confirmed that H2 can also act as an effective reductant for SCR
of NO in lean conditions, many reports have been published on
H2-SCR, most of which use platinum group metals as the active component. The performances of catalysts for H2-SCR are summarized in Table 1