“…Fax: +351 234 401 470. the catalyst's nature. 6,8,13,25,26 Formation of N 2 O during the NO x reduction reaction is also possible, and catalysts are optimized to minimize its formation, 19,31,41,42 or its reduction to molecular nitrogen. 10,17,29,43 One of the intermediates observed in the reduction of NO with CO is NCO, suggesting NO dissociation followed by reaction of an N adatom with CO. Interestingly, the NCO intermediate was not observed during the NO adsorption on Au/TiO 2 ; [44][45][46][47] but the formation of dinitrosyl complexes attached to the same Au atom, e.g., Au(NO) 2 species, either in the presence or in the absence of CO, 44,45 was detected.…”