The effect of Pt/Pd ratio on the oxidation activity and resistance to sulfur poisoning for Pt-Pd/BEA diesel oxidation catalysts with high siliceous content

This study investigates the effect of Pt/Pd ratio on oxidation activity and sulfur poisoning/regeneration diesel catalysts (DOC) using beta zeolites with high siliceous content as support. Formation Pt-Pd alloy leads to contraction cell lattice Pt in bimetallic catalysts, improving not only sintering resistance but also retaining a fraction Pd Pd2+ form. Moreover, improves particles, which enhances for CO C3H6 oxidation. Bimetallic favor NO reduction at lower temperature than monometallic although they showed values absolute conversion due decrease total number active sites. In addition, significantly improved compared catalyst. could easily recover their by thermal treatment either lean conditions or H2. The H2 was necessary completely C3H8