NO
x
and
CO formation is, at present,
a consequence arising from fuel production, but their emission need
not be. In this study, a series of novel Ir-containing TiO2-nanobelt catalysts were designed and prepared for the simultaneous
removal of NO
x
and CO. Activity data demonstrates
that the TiO2(B) support promotes NO reduction compared
to anatase. Furthermore, reaction efficiency (RE), a measure of NO
x
consumption vis-à-vis that of CO,
reveals that catalysts containing anatase promote CO oxidation more
so than their TiO2(B) counterparts. Increasing Ir concentration
over the latter promotes low-temperature catalytic performance, an
effect believed to be linked to the formation of Ir0–IrO2 composites. In situ DRIFTS experiments reveal
the relevance of nitrite/nitrate formation and consumption at 250
°C, a mechanism insinuated by the RE value. However, at 300 °C,
both TOF and RE increase, signifying the participation of a faster
and more-selective reaction, which appears consistent with the isocyanate-mediated
pathway.
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