Luca Lietti

TL;DR: In this paper, the authors investigated the NO x storage-reduction over the single Pt-Ba/Al 2 O 3 and Fe-ZSM-5 systems, both physically mixed and in dual bed configuration with the SCR catalyst placed downstream of the LNT catalyst.

TL;DR: In this article, the authors analyzed the NO x NO 2 storage process over Ba/Al2O3 and Pt-Ba/Al 2O3 NSR catalysts by performing experiments at 350°C with NO2 and NO/O2 mixtures using different complementary techniques (Transient Response Method, in situ FT-IR and DRIFT spectroscopies).

TL;DR: In this paper, the authors used FT-IR spectroscopy to follow temporal changes in the types and relative amounts of surface species formed at three different temperatures (423, 523, 623 K) during the reaction with NO, NO/O2, NO2 or NO2/O 2 atmospheres.

TL;DR: In this article, transient experiments performed over synthesized and commercial V2O5−WO3/TiO2 catalysts during catalyst conditioning and during step changes of the operating variables (SO2 inlet concentration and temperature) show that conditioning of the catalyst is required to attain significant and reproducible steady-state data in both the reduction of NOx and the oxidation of SO2.

TL;DR: In this paper, the storage-reduction of NOx over Pt-Ba/Al2O3 samples is analyzed in the presence of excess oxygen, and it is pointed out that the storage of NOX proceeds through two parallel routes: (i) the "nitrate route" where NO is oxidized to NO2 on Pt sites followed by NO2 disproportionation on Ba sites to form nitrates with evolution of gaseous NO.