Understanding Practical Catalysts Using a Surface Science Approach:The Importance of Strong Interaction between BaO and Al2O3 in NO_x Storage Materials

摘要

The interaction of NO2 with BaO/Al2O3/NiAl(110)model NO_x storage materials was investigated at BaO coverages corresponding to practical systems.The results obtained from these model systems show excellent collation with those of practical systems.We found a specific,strong interaction between BaO and Al2O3 and this interaction profoundly influences the NO_x chemistry.BaO readily forms a Ba-alummate-like surface phase,upon the interaction with NO2,Ba ions are pulled out from this surface layer to form Ba(NO3)2 clusters.