Influence of alumina-supported M-Pt catalysts in DeNOx reactions with M = Pd or Ir or Ru

摘要

To better understand N_2 formation in the selective catalytic reduction of NO_x by propene under oxidative atmosphere, we studied the catalytic behavior of bimetallics. Surface segregation phenomena may provoke geometric and electronic modifications of the catalytic active sites. To explain our results we invoked: (i) the facile way to oxidize the bimetallic aggregates, (ii) the presence of atoms with low coordination number able to be oxidized first and (iii) an eventual formation of like "vic-diNO_x species" on such bimetallics leading to N_2 formation.